SERVICE MANUAL

FILE NO. SM-CTV-O-081

COLOR TELEVISION

SERVICE MANUAL

MODELNO. 21E88

CHASSIS NO. CN-18EA

Please read this manual carefully before service.

SERVICE MANUAL

TABLE OF CONTENTS

SPECIFICATIONS

........................................................................................................... 1

SAFETY INSTRUCTIONS AND MAINTENANCE

....................................... 2

X-RAY RADIATION PRECAUTION ........................................................................................ 2

SAFETY PRECAUTION .......................................................................................................... 2

PRODUCT SAFETY NOTICE ................................................................................................. 3

SAFETY SYMBOL DESCRIPTION ......................................................................................... 4

MAINTENANCE ...................................................................................................................... 4

ADJUSTMENTS

................................................................................................................ 5

SET-UP ADJUSTMENTS........................................................................................................ 5

CIRCUIT ADJUSTMENTS ...................................................................................................... 8

CONTROL BUTTONS

................................................................................................. 23

CONTROL BUTTONS .......................................................................................................... 23

REMOTE CONTROL ............................................................................................................ 24

BASIC FUNCTIONS

......................................................................................................... 25

STRUCTURE AND CHASSIS FUNCTION DESCRIPTION

................ 28

STRUCTURE BLOCK DIAGRAM ......................................................................................... 28

BLOCK DIAGRAM FOR SUPPLY VOLTAGE SYSTEM ....................................................... 29

CHASSIS DESCRIPTION..................................................................................................... 30

SERVICE DATA

.............................................................................................................. 31

TECHNICAL DATA OF KEY ICS .......................................................................................... 31

SERVICE DATA OF KEY ICS............................................................................................... 55

REPLACEMENT OF PARTS

.................................................................................. 60

APPENDIX

1. CIRCUIT DIAGRAMS

2. FINAL ASSEMBLY DIAGRAMS

3. FIND WIRING DIAGRAMS

4. PRINTED CIRCUIT BOARD LAYOUTS

SERVICE MANUAL

SPECIFICATIONS

Model Number

RF system

Color system

Sound system

Video system

Programs preset

Antenna input

Picture tube

Effective screen dimensions

(Approx.)

21E88

PAL, NTSC3.58, NTSC4.43

B/G, M, D/K, I

PAL4.43, NTSC3.58, NTSC4.43 (50/60Hz)

236 (0-235)

75Ω(unbalanced)

406×305mm

Audio output (THD≤7%)

Main channel: 3W+3W

Power source

Weight (Approx.)

Dimensions

(W×H×D) (Approx.)

Rated power consumption

220V ~, 50Hz

23 Kg

585×457×484mm

Designs and specifications are subject to change without notice.

87W

1

SERVICE MANUAL

SAFETY INSTRUCTIONS AND MAINTENANCE

WARNING: BEFORE SERVICING THIS CHASSIS, READ THE

“

X-RAY RADIATION

PRECAUTION

” “

SAFETY PRECAUTION

” “

PRODUCT SAFETY NOTICE

”

BELOW.

X-RAY RADIATION PRECAUTION

1. The EHT must be checked every time the TV is serviced to ensure that the CRT does not emit

X-ray radiation as result of excessive EHT voltage. The maximum EHT voltage permissible in any operating circumstances must not exceed the rated value. When checking the EHT, use the High

Voltage Check procedure in this manual using an accurate EHT voltmeter.

2. The only source of X-RAY radiation in this TV is the CRT. The TV minimizes X-RAY radiation, which ensures safety during normal operation. To prevent X-ray radiation, the replacement CRT must be identical to the original fitted as specified in the parts list.

3. Some components used in this TV have safety related characteristics preventing the CRT from emitting X-ray radiation. For continued safety, replacement component should be made after referring the PRODUCT SAFETY NOTICE below.

4. Service and adjustment of the TV may result in changes in the nominal EHT voltage of the CRT anode. So ensure that the maximum EHT voltage does not exceed the rated value after service and adjustment.

SAFETY PRECAUTION

WARNING: REFER SERVICING TO QUALIFIED SERVICE PERSONNEL ONLY

.

1. The TV has a nominal working EHT voltage. Extreme caution should be exercised when working on the TV with the back removed.

1.1 Do not attempt to service this TV if you are not conversant with the precautions and procedures for working on high voltage equipment.

1.2 When handling or working on the CRT, always discharge the anode to the TV chassis before removing the anode cap in case of electric shock.

1.3 The CRT, if broken, will violently expel glass fragments. Use shatterproof goggles and take extreme care while handling.

1.4 Do not hold the CRT by the neck as this is a very dangerous practice.

2. It is essential that to maintain the safety of the customer all power cord forms be replaced exactly as supplied from factory.

3. Voltage exists between the hot and cold ground when the TV is in operation. Install a suitable isolating transformer of beyond rated overall power when servicing or connecting any test equipment for the sake of safety.

2

SERVICE MANUAL

4. When replacing ICs, use specific tools or a static-proof electric iron with small power (below 35W).

5. Do not use a magnetized screwdriver when tightening or loosing the deflection yoke assembly to avoid electronic gun magnetized and decrement in convergence of the CRT.

6. When remounting the TV chassis, ensure that all guard devices, such as nonmetal control buttons, switch, insulating sleeve, shielding cover, isolating resistors and capacitors, are installed on the original place.

7. Replace blown fuses within the TV with the fuse specified in the parts list.

8. When replacing wires or components to terminals or tags, wind the leads around the terminal before soldering. When replacing safety components identified by the international hazard symbols on the circuit diagram and parts list, it must be the company-approved type and must be mounted as the original.

9. Keep wires away from high temperature components.

PRODUCT SAFETY NOTICE

CAUTION: FOR YOUR PROTECTION, THE FOLLOWING PRODUCT SAFETY NOTICE

SHOULD BE READ CAREFULLY BEFORE OPERATING AND SERVICING THIS TV SET.

1. Many electrical and mechanical components in this chassis have special safety-related characteristics. These characteristics are often passed unnoticed by a visual inspection and the

X-ray radiation protection afforded by them cannot necessarily be obtained by using replacements rated at higher voltages or wattage, etc. Components which have these special safety characteristics in this manual and its supplements are identified by the international hazard symbols on the circuit diagram and parts list. Before replacing any of these components read the parts list in this manual carefully. Substitute replacement components which do not have the same safety characteristics as specified in the parts list may create X-ray radiation.

2. Do not slap or beat the cabinet or CRT, since this may result in fire or explosion.

3. Never allow the TV sharing a plug or socket with other large-power equipment. Doing so may result in too large load, causing fire.

4. Do not allow anything to rest on or roll over the power cord. Protect the power cord from being walked on, modified, cut or pinched, particularly at plugs.

5. Do not place any objects, especially heavy objects and lightings, on top of the TV set. Do not install the TV near any heat sources such as radiators, heat registers, stove, or other apparatus that produce heat.

6. Service personnel should observe the SAFETY INSTRUCTIONS in this manual during use and servicing of this TV set. Otherwise, the resulted damage is not protected by the manufacturer.

3

SERVICE MANUAL

SAFETY SYMBOL DESCRIPTION

The lightning symbol in the triangle tells you that the voltage inside this product may be strong enough to cause an electric shock. Extreme caution should be exercised when working on the TV with the back removed.

This is an international hazard symbol, telling you that the components identified by the symbol have special safety-related characteristics.

FDA

This symbol tells you that the critical components identified by the FDA marking have special safety-related characteristics.

UL

This symbol tells you that the critical components identified by the UL marking have special safety-related characteristics.

C UL

This symbol tells you that the critical components identified by the C-UL marking have been evaluated to the UL and C-UL standards and have special safety-related characteristics.

VDE

This symbol tells you that the critical components identified by the VDE marking have special safety-related characteristics.

MAINTENANCE

1. Place the TV set on a stable stand or base that is of adequate size and strength to prevent it from being accidentally tipped over, pushed off, or pulled off. Do not place the set near or over a radiator or heat register, or where it is exposed to direct sunlight.

2. Do not install the TV set in a place exposed to rain, water, excessive dust, mechanical vibrations or impacts.

3. Allow enough space (at least 10cm) between the TV and wall or enclosures for proper ventilation.

4. Slots and openings in the cabinet should never be blocked by clothes or other objects.

5. Please power off the TV set and disconnect it from the wall immediately if any abnormal condition are met, such as bad smell, belching smoke, sparkling, abnormal sound, no picture/sound/raster.

Hold the plug firmly when disconnecting the power cord.

6. Unplug the TV set from the wall outlet before cleaning or polishing it. Use a dry soft cloth for cleaning the exterior of the TV set or CRT screen. Do not use liquid cleaners or aerosol cleaners.

4

SERVICE MANUAL

ADJUSTMENTS

SET-UP ADJUSTMENTS

The following adjustments should be made when a complete realignment is required or a new picture tube is installed.

Perform the adjustments in the following order:

2. Convergence

Notes:

① The purity/convergence magnet assembly and rubber wedges need mechanical positioning.

② For some picture tubes, purity/ convergence adjustments are not required.

1. Color Purity Adjustment

Preparation:

Before starting this adjustment, adjust the vertical sync, horizontal sync, vertical amplitude and focus.

1.1 Face the TV set north or south.

1.2 Connect the power plug into the wall outlet and turn on the main power switch of the TV set.

1.3 Operate the TV for at least 15 minutes.

1.4 Degauss the TV set using a specific degaussing coil.

1.5 Set the brightness and contrast to maximum.

1.6 Counter clockwise rotate the R /B low brightness potentiometers to the end and rotate the green low brightness potentiometer to center.

1.7 Receive green raster pattern signals.

1.8 Loosen the clamp screw holding the deflection yoke assembly and slide it forward or backward to display a vertical green zone on the screen. Rotate and spread the tabs of the purity magnet around the neck of the CRT until the green zone is located vertically at the center of the screen.

1.9 Slowly move the deflection yoke assembly forward or backward until a uniform green screen is obtained.

1.10 Tighten the clamp screw of the assembly temporarily. Check purity of the red raster and blue raster until purities of the three rasters meet the requirement.

5

SERVICE MANUAL

Yok

Fig. 1

Preparation:

Before attempting any convergence adjustment, the TV should be operated for at least 15 minutes.

2.1 Center convergence adjustment

2.1.1 Receive dot pattern.

2.1.2 Adjust the brightness/contrast controls to obtain a sharp picture.

2.1.3 Adjust two tabs of the 4-pole magnet to change the angle between them and red and blue vertical lines are superimposed each other on the center of the screen.

2.1.4 Turn both tabs at the same time keeping the angle constant to superimpose red and blue horizontal on the center of the screen.

2.1.5 Adjust two tabs of the 6-pole magnet to superimpose red/blue line and green line.

2.1.6 Remember red and blue movement. Repeat steps 2.1.3～2.1.5 until optimal convergence is obtained.

2.2 Circumference convergence adjustment

2.2.1 Loosen the clamp screw holding the deflection yoke assembly and allow it tilting.

2.2.2 Temporarily put the first wedge between the picture tube and deflection yoke assembly. Move front of the deflection yoke up or down to obtain better convergence in circumference. Push the mounted wedge in to fix the yoke temporarily.

2.2.3 Put the second wedge into bottom.

2.2.4 Move front of the deflection yoke to the left or right to obtain better convergence in circumference.

2.2.5 Fix the deflection yoke position and put the third wedge in either upper space. Fasten the

6

SERVICE MANUAL deflection yoke assembly on the picture tube.

2.2.6 Detach the temporarily mounted wedge and put it in either upper space. Fasten the deflection yoke assembly on the picture tube.

2.2.7 After fastening the three wedges, recheck overall convergence and ensure to get optimal convergence. Tighten the lamp screw holding the deflection yoke assembly.

Fig. 2

4-pole Magnet Movement 6-pole Magnet Movement

Center Convergence by Convergence Magnets

Incline the Yoke Up (or Down) Incline the Yoke Right (or Left)

Circumference Convergence by DEF Yoke

Fig.3

3. White Balance Adjustment

Generally, white balance adjustment is made with professional equipment. It’s not practical to get good white balance only through manual adjustment. For TVs with I

2

C bus control, change the bus data to adjust white balance.

7

SERVICE MANUAL

CIRCUIT ADJUSTMENTS

Preparation:

Circuit adjustments should be made only after completion of set-up adjustments.

Circuit adjustments can be performed using the adjustable components inside the TV set. For TVs with

I

2

C bus control, first change the bus data.

1. Degaussing

A degaussing coil is built inside the TV set. Each time the TV is powered on, the degaussing coil will automatically degauss the TV. If the TV is magnetized by external strong magnetic field, causing color spot on the screen, use a specific degausser to demagnetize the TV in the following ways. Otherwise, color distortion will be shown on the screen.

1.1 Power on the TV set and operate it for at least 15 minutes.

1.2 Receive red full-field pattern.

1.3 Power on the specific degausser and face it to the TV screen.

1.4 Turn on the degausser. Slowly move it around the screen and slowly take it away from the TV.

1.5 Repeat the above steps until the TV is degaussed completely.

2. Confirmation and Adjustment for Voltage

Caution: +B voltage has close relation to high voltage. To prevent X-ray radiation, set +B voltage to the rated value.

2.1 Make sure that the supply voltage is within the range of the rated value.

2.2 Connect a digital voltmeter to the voltage output terminal of the main PCB. Power on the TV and set the brightness and sub-brightness to minimum. Ensure that the voltage from the main PCB reads as follows.

2.3 Regulate voltage adjustment components on the power section until the +B the voltage reaches the rated value.

Table 1

Test Point

Negative of VD851

Negative of VD852

Negative of VD854

Negative of VD857

Positive of C874

Voltage (V)

118V±2V

17V±1V

11V±1V

14V

+1V

-1.5V

9V±0.5V

Positive of C878

Positive of C800

5V±0.5V

5V±0.25V

Note:

It’s impossible to check the power part separately from the main chassis board as the part is mounted on the main chassis board. The power components, etc. should be checked for burnout when power-on. If burned out, do not power on the TV again until the cause is found out.

8

SERVICE MANUAL

3. High Voltage Inspection

Measure voltages of test points on the main PCB with the digital voltmeter. Measure the CRT high voltage with the high-voltage testing equipment and heater voltage with the high-frequency effective voltmeter. The rated values are shown as below.

Test Point

Negative of VD603

Negative of VD855A

CRT anode

Heater

Table 2

Voltage (V)

25±1.5V (for BSC6OU FBT only)

27±1.5V (for BSC62V1 FBT only)

195±5.0V

25±1.5KV (for IRICO，SHANGHAI NOVEL, LG, CHUNGHWA， and THAI CRTs)

27±1.5KV (SAMSUANG，BMCC)

6.3±0.3Vrms

Caution: Dangerously high voltages are present inside the TV. Extreme caution should be exercised when working on the TV with the back removed.

4.1 After removing the back cover, look for the FBT on the main PCB. There should be a FCB on the

FBT.

4.2 Power on the TV and preheat it for 15 min.

4.3 Receive a normal TV signal. Rotate knob of the FCB until you get a sharp picture.

Before Adjusting After Adjusting

Fig. 4

5.1 Inspection for insulation and voltage-resistant

Perform safety test for all naked metal of the TV. Supply high voltage of 3000V AC, 50Hz (limit current of 10mA) between all naked metal and cold ground. Test every point for 3 sec. and ensure no arcing and sparking.

9

SERVICE MANUAL

5.2 Requirements for insulation resistance

Measure resistance between naked metal of the TV and feed end of the power cord to be infinity with a DC-500 high resistance meter and insulation resistance between the naked metal and degaussing coil to be over 20MΩ.

6.1 To enter the DESIGN/SERVICE mode

Set the volume to 0. Then press and hold the MUTE button on the remote control, and press the

MENU button on the TV to enter the SERVICE mode. In this case, red “S”is displayed on the upper center of the screen. To exit from the S mode, turn off the TV set by the POWER button on the remote control.

Caution: The user service mode adjustment can be changed only when service personnel adjust the whole set data during servicing. As the control data have dramatic effects on functions and performance of the TV, service personnel should not tell user how to enter the SERVICE mode to avoid improper data settings.

6.2 Adjustments and bus data (CH08T0603)

Table 3 Function Description for Bus Data

Bit Function Description Status

Bit7.6

Audio system options (available during

00: B/G 01: I auto search and use of AUTO button)

10: D/K 11: M

Bit5

MODE0

Bit4

SECAM

INHIBIT

Bit2 SECAM

Bit1 AUTO2

Bit0

Power-on modes

00: SECAM gate pulse width, 2.2 usec

01: 2.0 usec

10: 1.8 usec

11: SECAM demodulation inhibit

When changing channels:

0: Y-MUTE 1: RGB MUTE

0: No 1: Yes

0: PAL 1: Without PAL

0: Memory on 1: Soft on

(continued)

10

SERVICE MANUAL

MODE1

Bit6

Bit5

NICAM DK for CHINA

With two sets of AV terminals,

0：Yes (Recommended) 1：No refresh AV terminals ?

0: No 1: Yes

Bit3 M

Bit2 D/K

Bit1 I

Bit0 B/G

0: No 1: Yes

0: No 1: Yes

0: No 1: Yes

0: No 1: Yes

0: No 1: Yes

0: No 1: Yes

MODE2

MODE3

Bit6 program

1: Old program

0: No 1: Yes Bit5 RF NTSC options

Bit4 Power-on message display 1: Yes 0: No (Recommended)

0: No 1: Yes Bit 3 NICAM sound with MDB

Bit 2 Mono system

Bit 1 Single language

Bit.0

1: Yes 0：No

1: Yes 0：No

TA1343 woofer or MDB output 0: Mono output 1: Overlapped to main mode options channel（Recommended）

BIT 7 Childlock vertical bug processing 0: Yes (Recommended) 1:No

BIT 6 Horizontal AFC bug processing 0: Yes (Recommended) 1:No

BIT 5 DVD option 1: No 0: Yes (Recommended)

BIT.4

Step length setting for lighting up 1: Large step (Recommended) 0：Small step gradually during power-on

(continued)

11

SERVICE MANUAL

BIT 3

Option bit for default language by

AUTO button and initialization

BIT 2 PWM output option

0: Chinese 1: English

0: No 1: Yes

BIT 1 Instant on 1: Yes 0：No

MODE4

OPT

BIT 0 AV Switch 4053 option 0: No 1: Yes

BIT 7

Audio processing IC (SOUND menu)

0: No 1: Yes

0: No 1: Yes

BIT 6 Woofer option in SOUND menu

BIT 5 TA1343 option 0: No 1: Yes

BIT 4 MSP3410G option (NICAM)

BIT 3 NJW1161 option (SRS IC)

0: No 1: Yes

0: No 1: Yes

BIT 2

NJW1160 option (BBE IC & SRS

IC)

BIT 1 NJW1137 option (BBE IC)

0: No 1: Yes

0: No 1: Yes

0: No 1: Yes

BIT 0 Soft IIC option

Bit 7 No use

Bit 6 VCO adjustments

Bit 5 No use

0: PIF VCO functions (PIFVCO = 10) during auto search and search；

1: PIFVCO = 10 during turn-on，and PIFVCO = 00 in Normal mode

Bit 4

Large-amplitude AFT switch when no signal

1: Off 0: On

Bit 3

Audio gain switch

0：927mVrms at 25kHz/dev

1：500mVrms at 25kHz/dev

(continued)

12

SERVICE MANUAL

OSD

RCUT

GCUT

BCUT

Bit 2 Y-MUTE

Bit 1 No use

Bit 0 No use

Horizontal position of OSD

R cut off

G cut off

B cut off

0: No 1: Yes

COLC

TNTC

TNTCAV

COLP

COLS

SCOL

Color center (for NTSC)

Tint center (for NTSC)

Tint center in VIDEO mode(for NTSC)

Color center (for PAL)

Color center (for SECAM)

Sub color center (for DVD)

(continued)

13

SERVICE MANUAL

ST3

SV3

ST4

SV4

SVD

Sharp center for NTSC 3.58 (TV)

Sharp center for NTSC 3.58 (VIDEO)

Sharp center for other color system (TV)

Sharp center for other color system (VIDEO)

Sub sharp center in DVD

TXCX

RGCN

ABL

DCBS

Bit 5

Bit 4

Bit 3.2

Bit 1.0

Bit 7

Bit 6

Bit 5.4

Bit 3.2

Text RGB in user contrast Max.

Text RGB in user contrast Min.

Y peak limiter

OSD ABL

ABL start point

ABL gain

Blank SW

OSD level

Y gamma

0: Off 1: On

0: Active 1: Inactive

00: ABL start point: 0V 01: -0.15V

10: -0.30V 11: -0.45V

00: -0.2V 01: -0.4V

10: -0.6V 11: -0.8V

0: H, V blanking on 1: H, V blanking off

00: OSD level, 80 IRE 01: 70IRE

10: 60IRE 11: 50IRE

00: Off 01: Y point 90 IRE, Gain –3dB

10: 80IRE 11: 70IRE

(continued)

14

SERVICE MANUAL

Bit 1.0 Black stretch

CLTO

Chroma data

(TV&not

M)

CLTM

(TV&M)

CLVD

(DVD)

CLVO

(50hz)

/CLVM

（

60hz）

(VIDEO)

Bit 7

Bit 6

Bit 5

Bit 4.3

Killer off

P/N ID

C gamma

NTSC matrix

Bit 2.1.0 Y DL

DEF

00: Off 01: Black stretch point, 25 IRE

10: 35IRE 11: 45IRE

0: Normal 1: Always killer off

0: PAL/ NTSC killer sensitivity, 1mVpp

1: 10mVpp

0: Color gamma off 1: On

00: USA (105 degree) 01: Japan (93 degree)

10: DVD 11:

000: -40 nsec 001: 0 010: 40 nsec

011: 80 nsec 100: 120 nsec 101: 160 nsec

110: 200 nsec 111: 240 nsec

BIT0 = 0: V AGC reference depends on YC VCC;

BIT0 = 1: V AGC reference depends on integrated regulator

HPOS

VP50

50hz horizontal phase 00: -3usec 10: 01F: +3usec

V phase (50Hz) 0: V phase delay, 0H 7: 7H

00: -50% 20: 0% 3F: 50%

Adjusting difference between horizontal centers in PAL and NTSC

HPS

VP60 V phase (60Hz) 0: V phase delay, 0H 7: 7H

Adjusting difference between vertical amplitudes in PAL and NTSC

HITS

VLIN V-linearity 0: -15% 8: 0% F: 15%

0: -16% 8: 0% F: 16%

(continued)

15

SERVICE MANUAL

VLIS

VSS

DPC

Adjusting difference between vertical linear in PAL and NTSC

Shift data of 50 Hz/ 60 Hz Correction

DPCS

HIT69

No use

No use

Vertical amplitude in 16:9 mode (PAL)

DPC69 No use

Vertical amplitude in 16:9 mode (NTSC)

HIT69S

DPC69S

No use

KEY No use

KEYS

WID

WIDS

ECCT

ECCB

VEHT

HEHT

SBY

SRY

BRTS

No use

No use

No use

No use

No use

No use

No use

Use in SECAM

Use in SECAM

Sub bright (difference)

RFAGC RF AGC

00: IF mute

01: 65dBu

3F: 100dBu

(continued)

16

SERVICE MANUAL

HAFC

V01

V25

V50

V100

Woofer

STAT

FLG0

FLG1

REFP

BIT 3.2

BIT 1.0

AFC gain

(in VIDEO mode)

AFC gain

(in TV mode)

Data Description

Blanking Period Picture Period

0 0 3 1

0 1 4/7 2/7

1 0 4/3 1

1 1 Off Off

Data Description

Blanking Period Picture Period

0 0 3 1

0 1 4/7 2/7

1 0 4/3 1

1 1 Off Off

Volume output data at 1%

Volume output data at 25%

Volume output data at 50%

Volume output data at 100%

TA1343 woofer Max.

No use

Bit 7

Bit 2

Bit 1

Bit 0

Bit 5

Bit 4

VCO readjust when

0: Enable 1: Disable position select

N buzz cancel

0: Nyquist buzz cancel, on 1: Off

AFT window SW

Over modulation

0: Wide (-/+ 250kHz) AFT sensitivity, for channel search

1: Narrow 83kHz) for normal operation

0: Normal 1: PIF over modulation switch on

0: SIF 1MHz convert gain, low gain 1: High gain MIX gain

Sync separation.

AKB pulse position

17

0: Sync separation level 40% 1: 36%

000: 0H 001: 1H 010: 2H 011: 3H

100: 4H 101: 5H 110: 6H 111: 7H

(continued)

SERVICE MANUAL

MOD

STBY

SVM

SVM1

SVM3

VBLK

UCOM

00: x 0 20: x 0.5 3F: x 1.0

00: x 0 20: x 0.5 3F: x 1.0

Bit

6.5.4

Bit 1.0

Bit 3.2

Bit 1.0

PIF frequency

AKB mode

VCD standby

IF standby

00: x 0 20: x 0.5 3F: x 1.0

001: 45.75 MHz 011: 38.9 MHz

100: 38.0 MHz

00: AKB off

01: ACB (cutoff: align to targets)

10: ADB (drive: align to targets)

11: AKB (cutoff/drive: align to targets)

00: Normal 01: Normal

10: Normal 11: VCD standby

00: Normal 01: Normal

10: Normal 11: IF standby

No use

No use

No use

BIT 3.2 V blanking stop point

BIT 1.0 V blanking start point

00: 310H(50hz) 263H(60hz)

01: 299H(50hz) 254H(60hz)

10: 295H(50hz) 250H(60hz)

11: 291H(50hz) 246H(60hz)

00: 23H(50hz) 22H(60hz)

01: 33H (50hz)30H(60hz)

10: 37H (50hz)34H(60hz)

11: 41H(50hz) 38H(60hz)

Bit 1.0

Bit 5.4.3

00: -32% 20: 0% 3F: 30%

00: GND 01: R output

Internal ADC

10: B output 11: Monitor RF AGC via ADC

Available range: 000….011

Improving NTSC color signal-to-noise ratio

(continued)

18

SERVICE MANUAL

TRE3

WFL3

WON1

WON2

FVOL

NVOL

EVOL

NICL

PYNX

PYNN

PYXS

PYNS

BASC

BASX

TREC

BALC

BAS1

TRE1

WFL1

BAS2

TRE2

WFL2

BAS3

Normal H.SYNC Max.

Normal H.SYNC Min.

ASM/search H.SYNC Max.

ASM/search H.SYNC Min.

Bass volume center

0-----------3F

0-----------3F

0-----------3F

0-----------3F

Bass volume Max.

Treble volume center

Balance volume center

BASS IN MUSIC MODE SET

Treble in MUSIC mode set

Woofer in MUSIC mode set

Bass in NEWS mode set

Treble in NEWS mode set

Woofer in NEWS mode set

Bass in THEATRE mode set

Treble in THEATRE mode set

Woofer in THEATRE mode set

TA1343 Max. woofer setting. The bigger the setting the smaller Max. woofer

Woofer liner set

Prescale FM/AM (No use in simple version)

Prescale NICAM (No use in simple version)

Prescale SCART input (No use in simple version)

NICAM->MONO level (No use in simple version)

19

(continued)

SERVICE MANUAL

NICH

NOIS

MONO->NICAM level (No use in simple version)

Bit 2

Bit 7-

Bit 0

AFC gain data setting in TV mode: 1: Adjust HAFC gain in the lowest two bits of HAFC

0: With weak signal received, AFC gain = 0x10; with strong signal received, AFC gain = 0x00

Criterion of signal strength: >NOIS: Weak signal

<= NOIS: Strong signal

Audio ATT 00:-85DB or less 7F:0DB (7 BITS)

No use

VATT

COM1

COM2

EQU1(12

345)

EUQ2(12

345)

EQU3(12

345)

BBE

OSDF

LANG

MDB68

(0x49)

MDB6A

(0x30)

No use

NICAM chip five-equalizer data when the sound mode set to MUSIC: (No use in simple version) B11 (for 120Hz) B12 (for 500 Hz) B13 (for 1.5KHz) B14 (for 5KHz)

B15 (for 10KHz)

NICAM chip five-equalizer data when the sound mode set to NEWS: (No use in simple version) B21 (for 120Hz) B22 (for 500 Hz) B23 (for 1.5KHz) B24 (for 5KHz) B25

(for 10KHz)

NICAM chip five-equalizer data when the sound mode set to THEATRE: (No use in simple version) B31(for 120Hz) B32 (for 500 Hz) B33 (for 1.5KHz) B34 (for 5KHz)

B35 (for 10KHz)

Highest four bits :BBE Low contour(0dB to 15dB) ；Lowest four bits: BBE process(0dB to 15dB)

OSD frequency set

Bit 1

Bit 0

Chinese

English

1: Yes 0: No

1: Yes 0: No

MDB effect strength

MDB harmonic content

00 hex MDB OFF (default) (No use in simple version)

7F hex maximum MDB

(No use in simple version)

00 hex no harmonics are added (default)

64 hex 50% fundamentals + 50% harmonics

7F hex 100% harmonics

(continued)

20

SERVICE MANUAL

MDB6C

(0x07)

MDB6B

(0x08)

Mdb2dh

(0x14)

Mdb2dL

(0x02)

(No use in simple version)

MDB high pass corner 2 20 Hz frequency 3 30Hz

30 300 Hz

(No use in simple version)

MDB low pass corner 5 50 Hz frequency 6 60Hz

30 300 Hz

(No use in simple version)

Subwoofer corner corner frequency in 10 Hz steps frequency

(range: 50...400 Hz)

Subwoofer complementary high-pass filter

(No use in simple version)

00 hex loudspeaker channel unfiltered

01 hex a complementary high-pass is processed in the loud-speaker output channel

02 hex MDB is set to OVERLAP mode

Table 5 Bus Data item data item data item data item data

MODE0 3D GDRV 40 CLTS 40 BSNS 00

MODE1 1F BDRV 40 CLVO 65 MOD 40

MODE2 09 CNTX 7F CLVD 60 STBY 00

MODE3 18 BRTC 40 DEF 01 SVM 00

MODE4 90 COLC 40 AKB 00 VBLK 00

LANG 03 TNTC 48 SECD 18 VCEN 16

MDB68 40 COLP F8 VP50 03 VTST 00

MDB6A 30 COLS 40 HIT 27 PYNX 2E

MDB6C 0A DCOL 20 HPS 03 PYNN 18

MDB6B 0A SCOL 00 VP60 00 PYXS 22

Mdb2dh 14 SCNT 0B HITS 01 PYNS 1E

Mdb2dL 02 CNTC 40 VLIN 08 BASC 40

(continued)

21

SERVICE MANUAL

EQU11 64 CNTN 01 VSC 04 BASX 70

EQU12 64 BRTX 25 VLIS 00 TREC 40

EQU13 64 BRTN 15 VSS 00 BALC 40

EQU14 64 COLX 3F HIT69 14 BAS1 64

EQU15 64 COLN 00 HIT69S 01 BAS2 20

EQU21 4B TNTX 28 SBY 05 BAS3 50

EQU22 19 TNTN 28 SRY 0C TRE1 64

EQU23 4B ST3 25 BRTS 00 TRE2 20

EQU24 19 SV3 30 RAGC 20 TRE3 50

EQU25 4B ST4 25 HAFC 09 WFL1 64

EQU31 32 SV4 30 V01 37 WFL2 00

EQU32 4B SVD 30 V25 60 WFL3 64

EQU33 32 ASSH 07 V50 6F WON1 01

EQU34 4B SHPX 3F V100 7F WON2 00

EQU35 32 SHPN 20 woofer 60 FVOL 0A

OSDF 64 TXCX 3F STAT 00 NVOL 5F

RCUT 40 DCBS 13 REFP 00 NICH 17

GCUT 38 CLTO 66 RSNS 00 NOIS 01

BCUT 35 CLTM 63 GSNS 00 VATT 70

Notes:

①

The data sheet may differ dependent on different models.

② The data sheet may differ dependent on different CRTs for the same model.

③ The data marked with “*”can be adjusted.

22

CONTROL BUTTONS

1. CONTROL BUTTONS

SERVICE MANUAL

Fig. 5 Front panel

Fig

Fig. 6 Rear panel

23

2. REMOTE CONTROL

SERVICE MANUAL

Fig. 7 Remote control

Notes:

(1) When in operation please point your remote control directly to the infrared sensor.

(2) Do not expose the remote control to impacts water or disassemble it.

(3) Do not repeatedly press the buttons on the remote control. Allow interval of no less than two seconds.

24

SERVICE MANUAL

3. BASIC FUNCTIONS

Power On/Off

1. Memory power on

Plug in the supply socket and press the MAIN POWER SWITCH on the TV. The TV enters the mode before power-off, or enters the STANDBY mode if in the STANDBY mode before power-off. In this case, you may press any of the POWER, CH-/CH+, 0-9 buttons on the remote control or

CH-/CH+

on the TV to turn on the TV.

2. Power off

When the TV in the TURN ON mode, press the POWER button to shift the TV to the STANDBY mode, press the MAIN POWER SWITCH directly to power off the TV at once.

Part of circuit on the TV remains active in the STANDBY mode. To cut off the power off completely, please press the MAIN POWER SWITCH.

Note:

Avoid switching the TV on and off frequently. Doing so may shorten life span of internal components.

General Operation

1. Intelligent operation

By this function, the TV can accomplish many important operation and settings, which is convenient for your operation.

1) Press the AUTO button and hold it for 2 sec so that the TV automatically completes some settings, such as settings for color/sound systems, picture/sound modes and volume.

2) After completion, the screen message “ASM?” is displayed. At this time, press the AUTO button again and the TV enters the ASM mode. It returns to CH No.1 after ASM. You may watch the TV program now.

· If with TUNING LOCK ON, the screen message “ASM?” will not appear and ASM doesn’t begin.

2. Channel selection

1) Pressing the CH-/CH+ buttons can select another lower-numbered or upper-numbered channel.

2) Direct selection

*To select a one-digit channel number

Press the -- button to choose “ -” firstly, then press one of 0-9 buttons.

*To select a two-digit channel number

Press the -- button to choose “ - -” firstly, then enter a first-digit and second-digit.

*To select a three-digit channel number

Press the -- button to choose “ - - -” firstly, then enter a first-digit, second-digit and third-digit.

Note:

Each digit should be entered at 3 sec. time interval.

3) Program scan

Press the SCAN button and the “SCAN OFF” appear on the screen. Press the button again and the

TV begins to scan from the current channel. To stop scan and start the corresponding operation, press any other buttons. The channel skipped cannot appear on the screen during scan.

4) Recall

Press the RECALL button and the TV will directly skip back to the previous program.

25

SERVICE MANUAL

3. On-screen display

Press the DISPLAY button repeatedly in the TV or AV mode to display the current information on the screen and turn off the display respectively.

With other OSD, pressing the DISPLAY button first can turn it off.

4.

Volume control

1) Press the VOL-/VOL+ buttons to decrease or increase the volume. Adjustable range, 0～100

2) During normal play, press the MUTE button and the sound is eliminated. The TV will display a red character on the screen.

To cancel MUTE, you may press the MUTE button again or the VOL+ buttons.

5. NICAM

Press the NICAM button to switch the TV among the following mode depending on signals received. If without NICAM, the button doesn’t function.

1) If with NICAM bilingual signals received press the

NICAM

button to switch the TV among the “△”,

“Ⅰ” and “Ⅱ” modes.

2) If with NICAM stereo signals received press the

NICAM

button to swith the TV among the “∞ ” and “△” modes.

Menus

Many operations get start from menu selection.

When watching TV programs, press the MENU button to display menu. Use the VOL-/VOL+ buttons repeatedly to highlight one of PICTURE, SETUP,

Use the CH+/CH- buttons to access a menu ( hand cursor is displayed before the highlighted item and the characters turn colored).

After calling up the menu, press the CH+/CH- buttons

BRIGHTNESS 50

SHARPNESS 100

SELECT↑↓ MOVE ← → to select an adjustment, and press the VOL-/VOL+ or

Channel

Number buttons to adjust as per the prompt on bottom of the screen.

Fig. 8

Press the LOCK, INFO or GAME button to access the related menu and use the way mentioned above to adjust.

Menu selections are omitted in the following function presentation.

The buttons on the TV share the same functions with those buttons of the same name on the remote control. If your remote control becomes invalid or lost, you can use many basic functions by pressing the buttons on the TV.

Note:

In the AV mode, TUNING menu is not available.

26

SERVICE MANUAL

Tuning in

This section gives descriptions about adjustment of items in the TUNING menu.

1. Auto search

After selecting “ASM” in the TUNING menu, press the VOL+ button. The TV will search automatically in sequence. After auto search, the TV will store receivable channels and returns to CH NO. 1.

Unused channel number is automatically set to

SKIP ON.

During auto search, press the VOL- button to stop searching.

Note:

During ASM, the Color system is generally set to

AUTO and Sound system to BG.

CH POS

BAND

SKIP

SEARCH

FINE TUNE

ASM

SELECT↑↓ MOVE ← →

7

VHFL

OFF

Fig. 9

2. Search

In case the desired channel cannot be preset with the ASM function, or you would like to set the desired channels to specific channel numbers, please use the SEARCH function.

After setting the desired BAND in the TUNING menu, select “SEARCH” and press the VOL-/VOL+ buttons. The TV searches another lower/upper channel. To stop search, press the MENU button.

If the selected channel is not the one you want, press the VOL-/VOL+ buttons again until the desired channel is selected. If the TV does not stop searching when finding a channel, please use the FINE TUNE function.

3. Frequency fine-tuning

After selecting “FINE TUNE” in the TUNING menu, press and hold down the VOL-/VOL+ buttons until you get the best sound and picture effect.

4. Skip

After auto search, there may be some repeated program or inferior signals received. Skipping the undesired program position can dramatically quicken channel selection.

Select “SKIP” in the TUNING menu, then press the VOL-/VOL+ buttons to set “SKIP ON”. After the

TUNING menu disappears, press the CH-/CH+ buttons and you will find the channel number skipped.

If you select the channel number by the Channel Number buttons, the channel number has changed to red.

To resume the channel number that has been skipped, repeat the operations mentioned above.

Then set “SKIP OFF”.

27

SERVICE MANUAL

STRUCTURE AND CHASSIS FUNCTION

1. STRUCTURE BLOCK DIAGRAM

2

8

SERVICE MANUAL

2. BLOCK DIAGRAM FOR SUPPLY VOLTAGE SYSTEM

29

SERVICE MANUAL

3. CHASSIS DESCRIPTION

General Description

CN-18EA chassis is applied in 21E88 series. By use of Toshiba V/C/D-MCU 2IN1 IC for TV small signal processing and bus control, the chassis enables TV tuning, adjustment, control and picture correction, featuring high-integration, high-performance-to-price ratio and high-reliability and compact circuit with fewer external components. The chassis, widely used in small and medium TVs, provides much more convenience for manufacturing and technical service. It includes:

2IN1 IC TMAP8801PSBNG for PAL/NTSC/SECAM small signal processing and bus control

EEPROM AT24C16 for data memory

LA78040 for vertical output power amplifying

TDA8944J (stereo)/TDA8943SF (mono) for audio power amplifying

TDA9808T combined with MSP3410G into NICAM/IGR demodulator

Thick-film IC STR-G5653 for power circuit adjustment and control

The following features are available in the chassis:

Color systems: PAL/NTSC/SECAM

Sound systems: D/K B/G I M

236 programs preset

Multilingual on screen display

I

2

C bus control

NICAM/IGR/AV stereo

Selectable picture/sound modes

Intelligent lock

Message board

Telephone directory

Game

Biorhythm

Calendar inquiry

The chassis mainly uses the following ICs and assemblies.

Table 5 Key ICs and Assemblies

Serial

No.

Position Type

1 D702 AT24C16 EERPOM

2 N201 TMPA8801PSBNG

Description

2IN1 IC (Small signal processor + micro control unit (MCU))

Audio power amplifier 3 N301 TDA8943SF/TDA8944J

4 N601 LA78040

5 N801 STR-G5653

6 NN01 TDA9808T

Vertical scan output stage circuit

Switch-mode power supply control

Audio IF demodulator

7 NN02 MSP3410G

8 U101 TDQ-5B6M

NICAM audio processor

Tuner

30

SERVICE MANUAL

SERVICE DATA

TECHNICAL DATA OF KEY ICS

1. TOSHIBA 2IN1 IC SERIES

1) General Description

Toshiba 2IN1 IC series are super ICs combined small signal processing with 8-bit micro control unit, including TMPA8801/8802/8803/8807/8808/8809/8812/8813/8821/8823/ 8827/8829 with the following features.

Table 6

Type

Type

(for ICs with OTP ROM)

Color System ROM

E/W

Correction

Package

TMPA8801CSBNG/

CPBNG/CMBNG

TMPA8802CSBNG/

CPBNG/CMBNG

TMPA8803CSBNG/

CPBNG/CMBNG

TMPA8801CSCNG/

CPCNG/CMCNG

TMPA8807CSBNG/

CPBNG/CMBNG

TMPA8808CSBNG/

CPBNG/CMBNG

TMPA8809CSBNG/

CPBNG/CMBNG

TMPA8813CSNG/

CPNG/CMNG

TMPA8821CSNG/

CPNG/CMNG

TMPA8823CSNG/

CPNG/CMNG

TMPA8827CSNG/

CPNG/CMNG

TMPA8829CSNG/

CPNG/CMNG

TMPA8812CSDNG/

CPDNG/CMDNG

TMPA8801PSBNG PAN/NTSC/SECAM 64K/48K/32K

TMPA8801PSBNG NTSC

TMPA8807PSBNG PAN/NTSC/SECAM 64K/48K/32K

TMPA8807PSBNG NTSC

TMPA8807PSBNG PAN/NTSC 64K/48K/32K

TMPA8813PSNG PAN/NTSC 64K/48K/32K SDIP64

TMPA8821PSNG PAN/NTSC/SECAM 64K/48K/32K SDIP64

TMPA8821PSNG PAN/NTSC 64K/48K/32K SDIP64

TMPA8827PSNG PAN/NTSC/SECAM 64K/48K/32K

TMPA8812PSDNG NTSC

64K/48K/32K

TMPA8801PSBNG PAN/NTSC 64K/48K/32K

TMPA8801PSCNG PAN/NTSC/SECAM 64K/48K/32K

SDIP64

SDIP64

SDIP64

SDIP64

TMPA8801/8807PSBNG is applied in the chassis as an important TV signal processing chip.

31

SERVICE MANUAL

TMPA8801/8807CMBNG /CPBNG/CRBNG /CSBNG

MCU AND SIGNAL PROCESSOR FOR A PAL/NTSC/SECAM TV

The TMPA8801/8807CMBNG /CPBNG /CRBNG /CSBNG is an integrated circuit for a PAL/NTSC/SECAM TV. A MCU and a TV signal processor are integrated in a 64-pin shrink DIP package.

The MCU contains 8-bit CPU, ROM, RAM, I/O ports, timer/counters, A/D converters, an on-screen display controller, remote control interfaces, IIC bus interfaces and the Closed

Caption decoder. The TV signal processor contains PIF, SIF, Video, multi-standard chroma, Sync, RGB processors.

MROM: TMPA8801/8807CMBNG (ROM: 32k)

TMPA8801/8807CPBNG (ROM: 48k)

TMPA8801/8807CRBNG (ROM: 56k)

TMPA8801/8807CSBNG (ROM: 64k)

OTP: TMPA8801/8807PSBNG ROM size 64k

Weight: 8.85 g (typ.)

Fig. 12

32

SERVICE MANUAL

2). Features

MCU

High speed 8-bit CPU (TLCS-870/X series)

Instruction execution time: 0.5 s (at 8 MHz)

(TMPA8801/8807CMBNG)

32-Kbytes ROM, 2-Kbytes RAM

(TMPA8801/8807CPBNG)

48-Kbytes ROM, 2-Kbytes RAM

(TMPA8801/8807CRBNG)

56-Kbytes ROM, 2-Kbytes RAM

(TMPA8801/8807CSBNG)

64-Kbytes ROM, 2-Kbytes RAM

ROM correction

12 I/O ports

14-bit PWM output 1 ch for a voltage synthesizer

7-bit PWM output 1 chan

8-bit A/D converter 3 ch for a touch-key input with key ON wake-up CIRCUIT

Remote control signal preprocessor

Two 16-bit internal timer/counter 2 ch

Two 8-bit internal timer/counter 2 ch

Time base timer, watchdog timer

16 interrupt sources: external 5, internal 11

IIC bus interface (multi-master)

STOP and IDLE power saving modes

TV Processor

IF

Integrated PIF VCO aligned automatically

Negative demodulation PIF

Multi-frequency SIF demodulator without external Tank-coil

Video

Integrated chroma traps

Black stretch

Y-gamma

Chroma

Integrated chroma BPFs

PAL/NTSC/SECAM demodulation

CCD Decoder

Digital data slicer for NTSC

OSD

Clock generation for OSD display

Font ROM characters: 384 characters

Characters display: 32 columns 12 lines

Composition: 16 18 dots

Size of character: 3 (line by line)

Color of character: 8 (character by character)

Display position: H 256/V 512 steps

BOX function

Fringing, smoothing, Italic, underline function

Conform to CCD REGULATION

Jitter elimination

RGB/Base-Band

Integrated 1 H base-band delay line

Base-band TINT control

Internal OSD interface

Half-tone and transparent for OSD

External YCbCr interface for DVD

RGB cut-off/drive controls by bus

ABCL (ABL and ACL combined)

Sync.

Integrated fH ×640 VCO

DC coupled vert. ramp output (single)

EW correction with EHT input (For

TMPA8807 Only)

AV Switch (For TMPA8801 Only)

1 for video and 1 for audio (monaural)

33

3). Block Diagram for TMPA8801

SERVICE MANUAL

Fig. 13

34

4). Block Diagram for TMPA8807

SERVICE MANUAL

Fig. 14

35

SERVICE MANUAL

6

7

8

9

2

3

4

5

10

11

5). Basic Structure

5.1). Internal Connections

TMPA8801/8807 has two pieces of IC chip in one package, using Multi-Chip-Package (MCP) technology. One is a micro controller (MCU) and the other one is a signal processor (SP) for a color TV. There are some internal connections between these two ICs for handling below signals.

Table 7 Signal Name Direction Description

1

Signal Name

SCL

Direction

M to S

Description

Internal IIC bus SCL

SDA

OSD R

OSD G

OSD B

OSD Y/BL

OSD I, CS OUT

C-Video

C-Sync

HD

VD

Bi-direction

M to S

M to S

M to S

M to S

M to S

S to M

S to M

S to M

S to M

Internal IIC bus SDA

OSD signal connection

OSD signal connection

OSD signal connection

OSD display control

OSD half-tone control/Test pattern signal

Composite video signal from internal video switch, for CCD

Composite sync. signal from sync. Separator, for CCD

Horizontal timing pulse regenerated from FBP, for OSD

Vertical timing pulse from sync. Separator, for OSD

12 CLK M to S 8 MHz clock

13 AV

DD

14 ADC

M to S

S to M

Reference voltage for C-Video interface

A/D converter monitoring RF-AGC, R-Y and B-Y

Functions of SP from MCU are controllable through the IIC bus of the internal connections.

5.2). Power Supply

TMPA8801/8807 has some power supplys and GND pins. Power supplies related MCU must be applied at the first. Power supplies for H.VCC and TV D.VCC are the second with at least 100 ms delay after MCU power

ON. The other power supplies are the last, which are recommended to be supplied from a regulator circuit using FBP.

5.3). Crystal Resonator

TMPA8801/8807 requires only one crystal resonator, in stead that a conventional two-chip solution requires two resonators at least, one for MCU and the other one for SP. An oscillation clock with the crystal resonator of TMPA8801 /8807is supplied for MCU operation, PIF VCO automatic alignment, alignment free AFT, chroma demodulation and horizontal oscillation. The oscillation frequency is very important so that those

36

SERVICE MANUAL of functions work properly, so that designing the oscillation frequency accurately is required. The spec of crystal is recommended to be within fosc: 8 MHz +/-20 ppm ftemp: 8 MHz +/-40 ppm (-20°C to +65°C)

While RESET of MCU is active, the MCU function stops. Hardware and software initialization sequence including power supplies control is required, because status of any hardware after the RESET period is unknown especially horizontal oscillator which is a very basic timing generator of SP operation.

6).Terminal Interface

MCU Block

Pin No.

1

2

3

Pin Name Interface Ci

P61/LED1/ADC 8 bit

(/KWU5)

(AIN5)

(LED1)

P60/ADC 8 bit

(/KWU4)

(AIN4)

P53/ADC 8 bit/TC1/Int2

(/KWU0)

(AIN0)

(TC1)

(INT2)

5 /Reset

6

7

8

XOUT

XIN

TEST

5 V

54 uP

MPAGND

I/O

I/O

(input)

(input)

(output)

I/O

(input)

(input)

I/O

(input)

(input)

(input)

(input)

Power

Supply

I/O

Output

Input

Input

Power

Supply

Power

Supply

Power

Supply

Table 8

Function

Key on wake up input

A/D converter analog input

High current sink open drain output

Key on wake up input

A/D converter analog input

Key on wake up input

A/D converter analog input

Timer/counter input

External interrupt input

GND

Reset signal input or watchdog timer output

Address trap reset output

X’tal connecting pins

Test pin for out-going test.

Be tied to low.

VDD

Supply 5 V

GND for Slicer circuit

GND for

Oscillator circuit

(continued)

37

SERVICE MANUAL

5 V

56 P56

57 P52/SDA

(SDA)

58 P51/SCL

(SCL)

59 P50/PWM 7 bit/TC2/

Int0

(/PWM8)

(TC2)

(/INT0)

60 P40/PWM 14 bit

(/PWM0)

61 P20/Int5/Stop

(/INT5)

(/STOP)

62 P31/Int4/TC3

(INT4)

(TC3)

63 P30/Int3/RXIN

(INT3)

(RXIN)

64 P63/LED2/

(LED2)

Signal Processor Block

I/O

(input)

(input)

I/O

(input)

(input)

I/O

(output)

I/O

(output)

(input)

(input)

I/O

(output)

I/O

(input)

(input)

Power

Supply

I/O

(I/O)

VDD for OSD Oscillator circuit

Supply 5 V

I/O

I/O

(I/O) IIC bus serial data input/output

IIC bus serial clock input/output

7-bit D/A conversion (PWM) output

Timer/Counter input

External interrupt input

14/12-bit D/A conversion (PWM) output

External interrupt input

STOP mode release signal input

External interrupt input

Timer/Counter input

External interrupt input

Remote control signal

Preprocessor input

High current sink open drain output

Pin No. Pin Name

11

12

13

14

TV AGND

FBP in

HOUT

HAFC 1

Table 9

Function

GND terminal for Analog block.

Input terminal for FBP.

Output terminal for Horizontal driving pulse.

Terminal to be connected capacitor for HAFC filter.

This terminal voltage controls H VCO frequency.

(continued)

38

19

20

22

23

24

25

26

35

29

30

31

32

33

15

16

17

18

27

28

SERVICE MANUAL

V saw

V OUT

H.VCC 9 V

-(For TMPA8801)

YS in

(For TMPA8807)

Cb input

Y input

TV DGND

CIN

EXT CVBS/Y (V2 IN)

TV DVCC

TV IN

(V1 in)

(For TMPA8801) fsc out

(For TMPA8807)

ABCL

AU out

(For TMPA8801)

Ew out

(For TMPA8807)

IF VCC 9 V

TVout

SIF out

EXT AU in

(For TMPA8801)

EXT in

(For TMPA8807)

H.correc/SIF in

Terminal to be connected capacitor to generate V saw signal.

V saw amplitude is kept constant by V AGC function.

Output terminal for Vertical driving pulse.

VCC terminal for DEF circuit. Supply 9 V.

Connect to GND via resister

Terminal for switching of PIP mode

PIP signal (YUV input)

1.75V

Main signal (TV/EXT/YC)

GND

Ys voltage

Input terminal for Cb signal.

Input terminal for Y signal. (Input level =1 Vp-p

Input terminal for Cr signal. It is recommended that input impedance is low.

GND terminal for Digital block.

Input terminal for Chroma signal.

Input terminal for Video signal.

(Input level =1 Vp-p)

VCC terminal for Digital block.

This terminal voltage is clipped about 3.3 V by regulator circuit.

Supply TV DVCC voltage from HVCC

(#17) voltage via 27Ω.

Input terminal for Video signal.

(Input level =1 Vp-p)

Output terminal for fsc wave signal.

(Output level =0.55Vp-p typ.)

Input terminal for ABL/ACL control.

Output terminal for Audio signal.

Output terminal for East-West correction signal.

VCC terminal for IF circuit.

Supply 9 V.

Output terminal for detected PIF signal.

(Output level =2.2 Vp-p)

Output terminal for detected SIF signal.

Input terminal for External Audio signal.

PIF PLL

Input terminal for EHT feedback signal.

Input terminal for H correction and 2 nd

SIF.

Terminal to be connected capacitor for DC Negative

Feedback from SIF

Det output.

Terminal to be connected with loop filter for PIF PLL.

This terminal voltage is controlled

PIF VCO frequency.

(continued)

39

50

51

52

53

45

46

47

36

37

38

39

40

41

42

43

44

48

SERVICE MANUAL

IF VCC 5 V

S-Reg.F

Deemph/

Audio out

IF AGC

IF GND

IF IN

RF AGC

YC VCC 5 V

VCC terminal for IF circuit.

Supply 5 V.

Terminal to be connected capacitor for stabilizing internal bias.

Terminal to be connected capacitor for SIF Det

De-Emphasis.

Terminal to be connected with IF

AGC filter.

GND terminal for IF circuit.

Input terminals for IF signals.

Pin 41 and Pin 42 are both input poles of differential amplifier.

Monitor out

Black Det

APC Fil

(Chrome PLL filter)

IKin

9 V

ROUT

GOUT

BOUT

TV AGND

Output terminal for RF AGC control level.

VCC terminal for Y/C circuit.

Supply 5 V.

Output terminal for CVBS or Y signal selected by BUS (video

SW).

Terminal to be connected with

Black Det filter for black stretch.

Terminal to be connected with

APC filter for Chroma demodulation.

This terminal voltage controls frequency of VCXO.

Input terminal to sense AKB cathode current.

VCC terminal for RGB circuit.

Supply 9 V.

Output terminal for R signal.

Output terminal for G signal.

Output terminal for B signal.

GND terminal for Analog block.

40

SERVICE MANUAL

7). Microcontrollers Descriptions (MROM version: TMPA8801/8807CMBNG /CPBNG /CRBNG

/CSBNG)

Fig. 15

41

SERVICE MANUAL

2. AUDIO POWER AMPLIFIER TDA8943SF/TDA8944J

6 W MONO BRIDGE TIED LOAD (BTL) AUDIO AMPLIFIER

1). General description

The TDA8943SF is a single-channel audio power amplifier with an output power of

6 W at an 8

Ω load and a 12 V supply. The circuit contains a Bridge Tied Load (BTL) amplifier with an all-NPN output stage and standby/mute logic. The TDA8943SF comes in a 9-lead single in-line (SIL) medium power package. The TDA8943SF is printed-circuit board (PCB) compatible with all other types in the TDA894x family.

One PCB footprint accommodates both the mono and the stereo products.

2). Features

Few external components

❷

Fixed gain

❷

Standby and mute mode

❷

No on/off switching plops

❷

Low standby current

❷

High supply voltage ripple rejection

❷

Outputs short-circuit protected to ground, supply and across the load

❷

Thermally protected

❷

Printed-circuit board compatible.

3). Block diagram

Fig. 16

4). Pinning information

42

SERVICE MANUAL

4.1) Pinning

4.2) Pin description

Fig 17. Pin configuration.

OUT

−

V

CC

OUT+

Symbol

1

3

Table 10 Pin description

Pin Description

negative loudspeaker terminal positive loudspeaker terminal

IN

−

SVR 6 half supply voltage decoupling (ripple rejection)

MODE 7 mode selection input (standby, mute, operating)

GND 8 ground n.c.

9 not connected

TDA8943SF:Mono Bridge Tied Load (BTL) audio amplifier, Max output power:6W

43

SERVICE MANUAL

3. TDA8944J

2 X 7 W STEREO BRIDGE TIED LOAD (BTL) AUDIO AMPLIFIER

1). General descriptio n

The TDA8944J is a dual-channel audio power amplifier with an output power of

2

× 7 W at an 8 Ω load and a 12 V supply. The circuit contains two Bridge Tied Load

(BTL) amplifiers with an all-NPN output stage and standby/mute logic. The TDA8944J comes in a 17-pin DIL-bent-SIL (DBS) power package. The TDA8944J is printed-circuit board (PCB) compatible with all other types in the TDA894x family.

One PCB footprint accommodates both the mono and the stereo products.

2). Features

❷

Few external components

❷

Fixed gain

❷

Standby and mute mode

❷

No on/off switching plops

❷

Low standby current

❷

High supply voltage ripple rejection

❷

Outputs short-circuit protected to ground, supply and across the load

❷

Thermally protected

❷

Printed-circuit board compatible.

3). Block diagram

Fig 18. Block diagram.

44

SERVICE MANUAL

4). Pinning information

4.1) Pinning

Fig 19. Pin configuration.

4.2) Pin description

Table 11 Pin description

Symbol Pin

OUT1

−

GND1

1

2

V

CC1

OUT1

+

3

4 n.c. 5

IN1

+

6 n.c. 7

IN1

−

IN2

−

MODE

8

9

10

Description

negative loudspeaker terminal 1 ground channel 1 supply voltage channel 1 positive loudspeaker terminal 1 positive input 1 negative input 1 negative input 2 mode selection input (standby, mute, operating)

(continued)

45

SERVICE MANUAL

SVR

IN2

+

11

12 n.c. 13

OUT2

−

14

GND2

V

CC2

OUT2+

15

16

17 half supply voltage decoupling (ripple rejection) positive input 2 negative loudspeaker terminal 2 ground channel 2 supply voltage channel 2 positive loudspeaker terminal 2

TDA8944J: Stereo power amplifier, Max output power: 2×7W

46

SERVICE MANUAL

4. VERTICAL SCAN OUTPUT STAGE CIRCUIT LA78040/LA78041

Both LA78040/LA78041 are vertical scan output stage power amplifiers. But there is a little bit difference between the two amplifiers, that is, LA78040 has supply voltage of

24V and output current of 1.8A

P-P

while LA78041 has supply voltage of 30V and output current of 2.2A

P-P

.

LA78040 /LA78041

Vertical Deflection Output Circuit

1). Features

·Low power dissipation due to built-in pump-up circuit

·Vertical output circuit

·Thermal protection circuit built in

·Excellent crossover characteristics

DC coupling possible Fig. 20

2). Block Diagram

Package Type: TO-220-7H

Fig.21

47

SERVICE MANUAL

5. TDA9808T

SINGLE STANDARD VIF-PLL WITH QSS-IF AND FM-PLL DEMODULATOR

1). Features

·5V supply voltage (9V supply voltage for

TDA9808T (DIP20) only)

·Applicable for IFs (lntermediate Frequencies) of

38.9MHz, 45.75MHz and 58.75 MHz

·Gain controlled wide band Video IF (VIF)- amplifier (AC-coupled)

·True synchronous demodulation with active carrier regeneration (very linear demodulation, good intermodulation figures, reduced harmonics, excellent pulse response)

·Robustness for over-modulation better than 105% due to Phase Locked Loop (PLL)-bandwidth control at negative modulated standards

·VIF Automatic Gain Control (AGC) detector for gain control, operating as peak sync detector

2). General Description

The TDA9808T is an integrated circuit for single standard (negative modulated) vision

IF signal processing and FM demodulation, with single reference QSS-IF in TV and VTR sets.

·Tuner AGC with adjustable TakeOver Point (TOP)

·Automatic Frequency Control (AFC) detector without extra reference circuit

·AC-coupled limiter amplifier for sound intercarrier signal

·Alignment-free FM-PLL demodulator with high linearity

·Sound IF (SIF) input for single reference Quasi

Split

Sound (QSS) mode (PLL controlled); SIF AGC detector for gain controlled SIF amplifier, single reference QSS mixer for high performance

·Electrostatic Discharge (ESD) protection for all pins.

48

3).Block Diagram

SERVICE MANUAL

49

SERVICE MANUAL

6. MSP34X0G

MULTISTANDARD SOUND PROCESSOR FAMILY

Release Note: Revision bars indicate significant changes to the previous edition. The hardware

Other processed standards are the Japanese

FM-FM multiplex standard (EIA-J) and the and software description in this document is valid for the MSP34X0G version B5 and following

FM Stereo Radio standard. versions.

Current ICs have to perform adjustment procedures in order to achieve good stereo separation for BTSC and EIA-J.

1). Introduction

The MSP34X0G family of single-chip

Multistandard Sound Processors covers

The MSP34X0G has optimum stereo performance without any adjustments. the sound processing of all analog

TV-Standards worldwide, as well as the

All MSP34X0G versions are pin and

NICAM digital sound standards. The full TV software downward-compatible to the sound processing, starting with analog sound IF signal-in, down to processed analog AF-out, is performed on a single chip. Figure 10 shows a

MSP34X0G.

MSP34X0G. The MSP34X0G further simplifies controlling software. Standard selection requires a single I

2

C transmission only. simplified functional block diagram of the

The MSP34X0G has built-in automatic

Functions: The IC is able to detect the actual sound standard automatically (Automatic

This new generation of TV sound processing ICs

Standard Detection). Furthermore, pilot levels now includes versions for processing the and identification signals can be evaluated multichannel television sound (MTS) signal conforming to the standard recommended by the internally with subsequent switching between mono/stereo/bilingual, no I

2

C interaction is

Broadcast Television Systems Committee necessary (Automatic Sound Selection).

(BTSC). The DBX noise reduction, or alternatively MICRONAS Noise Reduction

The ICs are produced in submicron CMOS

(MNR) is performed alignment free. technology.

The MSP34X0G is available in the following packages, PLCC68, PSDIP64, PSDIP52,

PQFP80 and PLQFP64.

2). Block Diagram

Fig. 23 Simplified Functional Block Diagram of the MSP34X0G

50

SERVICE MANUAL

7. EEPROM AT24C04/08/16

1) Features

Low-voltage and Standard-voltage Operation

-2.7 (Vcc=2.7V to 5.5V)

-1.8 (Vcc=1.8V to 5.5V)

Internally Organized 128x8(1K), 256x8 (2K), 512x8 (4K),

1024x8 (8K) or 2048x8 (16K)

2-wire Serial Interface

Schmitt Trigger, Filtered Inputs for Noise Suppression

Bi-directional Data Transfer Protocol

100kHz (1.8V, 2.5V, 2.7V) and 400 kHz (5V) Compatibility

Write Protect Pin for Hardware Data Protection

8-byte Page (1K, 2K), 16-byte Page (4K, 8K, 16K) Write Modes

Partial Page Writes are Allowed

Self-timed Write Cycle (10 ms max)

High-reliability

-Endurance: 1 Million Write Cycles

- Data Retention: 100 Years

Automotive Grade and Extended Temperature Devices Available

8-lead PDIP, 8-lead JEDEC SOIC, 8-lead MAP and 8-lead TSSOP Package

2-wire

Serial EEPROM

AT24C01A 1K (128 x 8)

AT24C02 2K (256 x 8)

AT24C04 4K (512 x 8)

AT24C08 8K (1024 x 8)

AT24C16 6K (2048 x 8)

2) Description

The AT24C01A/02/04/08/16 provides 1024/2048/4096/8192/16384 bits of serial electrically erasable and programmable read-only memory (EEPROM) organized as 128/256/512/1024/2048 words of 8 bits each. The device is optimized for use in many industrial and commercial applications where low-power and low-voltage operations are essential. The AT24C01A/02/04/08/16 is available in space-saving

8-pin PDIP, 8-lead JEDEC SOIC, 8-lead MAP and 8-lead TSSOP packages and is accessed via a

2-wire serial interface. In addition, the entire family is available in 2.7V (2.7V to 5.5V) and 1.8V (1.8V to

5.5V) versions.

51

3) Pin Configuration

Pin Name

SCL

Table 12

Function

Serial Clock Input

SERVICE MANUAL

A0

A2

GND

3

4

1

2

8-lead TSSOP

6

5

8

7

VCC

WP

SCL

SDA

VCC

WP

SCL

SDA

8

7

6

5

8-lead MAP

3

4

1

2

A0

A1

A2

GND

Bottom View

Fig. 24

A0

A1

A2

GND

1

2

3

4

8-pin PDIP

8

7

6

5

VCC

WP

SCL

SDA

A0

A1

A2

GND

3

4

1

2

8-lead SOIC

6

5

8

7

VCC

WP

SCL

SDA

Fig.25

4) Pin Description

SERIAL CLOCK (SCL): The SCL input is used to positive edge clock data into each EEPROM device and negative edge clock data out of each device.

SERIAL DATA (SDA): The SDA pin is bi-directional for serial data transfer. This pin is open-drain driven and may be wire-ORed with any number of other open-drain or open-collector devices.

DEVICE/PAGE ADDRESSES (A2, A1, A0): The A2, A1 and A0 pins are device address inputs that are hard wired for the AT24C01A and the AT24C02. As many as eight 1K/2K devices may be addressed on a single bus system (device addressing is discussed in detail under the Device Addressing section).

The AT24C04 uses the A2 and A1 inputs for hard wire addressing and a total of four 4K devices may be addressed on a single bus system. The A0 pin is a no connect.

The AT24C08 only uses the A2 input for hardwire addressing and a total of two 8K devices may be addressed on a single bus system. The A0 and A1 pins are no connects.

The AT24C16 does not use the device address pins, which limits the number of devices on a single bus to one. The A0, A1 and A2 pins are no connects.

WRITE PROTECT (WP): The AT24C01A/02/04/16 has a Write Protect pin that provides hardware data

52

SERVICE MANUAL protection. The Write Protect pin allows normal read/write operations when connected to ground (GND).

When the Write Protect pin is connected to Vcc, the write protection feature is enabled and operates as shown in table 13.

Table 13

Part of the Array Protected WP Pin

Status

At Vcc Full (1K)

Array

Full (2K)

Array

Full (4K)

Array

Normal

Read/

Write

Operation

Upper

Half

(8K)

Array

At GND Normal Read/Write Operations

5) Memory Organization

AT24C01A, 1K SERIAL EEPROM: Internally organized with 16 pages of 8 bytes each, the 1K requires a 7-bit data word address for random word addressing.

AT24C02, 2K SERIAL EEPROM: Internally organized with 32 pages of 8 bytes each, the 2K requires an 8-bit data word address for random word addressing.

AT24C04, 4K SERIAL EEPROM: Internally organized with 32 pages of 16 bytes each, the 4K requires a 9-bit data word address for random word addressing.

AT24C08, 8K SERIAL EEPROM: Internally organized with 64 pages of 16 bytes each, the 8K requires a 10-bit data word address for random word addressing.

AT24C16, 16K SERIAL EEPROM: Internally organized with 128 pages of 16 bytes each, the 16K requires an 11-bit data word address for random word addressing.

6) Block Diagram

Fig.26

53

SERVICE MANUAL

8. SWITCH-MODE POWER SUPPLY IC STRG5653/G8656

1). General Description

The STRG5653/G8656 are part of the STRG5600/G8600 series thick-film ICs for switch-mode power supply incorporating power MOSFET with a high-precise error amplifier. The ICs feature fewer external components, small-size and standard power supply.

The series STR-G8600 use Chip on Chip technology with the same operation principle as

STR-G5600. Pin configuration, function and threshold of STR-G8600 are compatible with those of

STR-G5600.

2) Block Diagram

Fig.27

3).Function of Terminal

Table 14 Function of Terminal

Symbols Description Functions Terminal

No.

1

2

D

S

4 VIN

Drain Terminal

Source Terminal

MOS FET drain

MOS FET source

Ground

Power supply Terminal Input of power supply for control signals

Overcurrent/Feedback Input of overcurrent detection signal and constant voltage signals

54

SERVICE MANUAL

SERVICE DATA OF KEY ICS

Table 14 Functions and Service Data of AT24C08/16 Pins

Pin No.

Function Description

Reference Voltage

(V)

0

Digital Multimeter

Positive Resistance

(20KΩ)

0.001

Negative Resistance

(20KΩ)

0.00

0 0.001 0.00

0

0

5

6 Data 4.99

7 PW write protect 4.99

5

0.001

0.001

7

6.9

9.5

3.5

0.00

0.00

4.83

5.15

5.31

3.25

Pin No.

1

2

Table 15 Functions and Service Data of MSP3410G Pins

Function Description

Reference Voltage

(V)

TP NC 0.16

AVD-GL-OUT NC 2.52

Digital Multimeter

Positive Resistance

(20KΩ)

7.3

Negative Resistance

(20KΩ)

5.3

6.8 5.51

3

4

D-CTR-I/O-1 NC

D-CTR-I/O-0 NC

5 ADR-SEL

0.01

0.01

4.79

6 STANDBYQ

7 I2C-CL

8 I2C-DA

4.79

3.56

3.9

7.3

7.2

0.7

0.7

7

7

5.57

5.58

4.54

4.54

4.44

4.44

9 I2S-CL NC 2.36

10 I2S-WS NC 2.4

11 I2C-DA-WT NC 2.36

12 I2S-DA-IN1 NC 0.07

13 ADR-DA NC 0.07

14 ADR-WS 0.07

15 ADR-CL 0.07

7.2

7.2

7.2

7.2

7.2

7.2

7.2

6.24

6.24

6.24

5.29

5.59

5.59

5.59

(Continued)

55

SERVICE MANUAL

16 DVSVP 4.79

17 DVSS 0.01

18 I2S-DA-IN2 NC 0.07

19 NC 0

20 RESETQ

21 DACA-R NC

4.76

0.8

22 DACA-L NC 0.08

23 VREF-I

24 DACM-R

25 DACM-L

0.01

0.17

0.08

26 DACM-SVB NC 0.18

27 SC2-OUT-R NC 3.82

28 SC2-OUT-L NC 3.82

30 SC1-OVT-R

0.01

3.82

31 SC1-OUT-L

32 SAPL-A

33 AHVSUP

34 CAPL-M

35 AHVSS

36 ABNDC

3.82

7.19

8

7.2

7.2

0.01

37 SC3-ZN-L NC

38 SC3-IN-R NC

39 SC2-IN-L NC

40 SC2-IN-R NC

41 SC1-IN-L

42 SC1-IN-R

43 VREFTOP

44 WONO-IN NC

45 AVSS

46 AVSVP

47 ANA-IN1+

3.74

3.77

3.77

3.77

3.77

3.77

2.6

3.78

0.01

4.9

1.53

3.6

7.1

7.1

0.001

7.1

7.1

7.1

1.3

7.1

7.1

0.001

0.7

0.001

7.3

∞

7

3.5

3.5

0.001

3.5

3.5

7.1

7.1

7.1

7.1

7.1

7.1

1.6

7

0.001

0.7

7.3

56

3.6

5.92

5.91

0.00

5.91

5.92

6.04

4.59

6.04

0.00

6.02

4.54

0.00

5.31

∞

5.24

3.54

3.52

0.00

3.52

3.54

6.1

6.1

6.1

6.1

6.1

6.1

1.63

6.1

0.00

4.53

5.27

(Continued)

SERVICE MANUAL

48 ANA-IN1-

49 ANA-IN2+

50 TESTEN

51 XTAL-2N

52 XTAL-OUT

1.53

0.09

0.01

2.35

2.36Hs

7.3

7.3

0.001

6.8

6.8

5.26

5.27

0.00

5.27

5.3

Pin No.

1

Table 16 Functions and Service Data of TDA9808T Pins

Function Description

PIF signal input 1

Reference

Voltage (V)

3.23

Digital Multimeter

Positive

Resistance (20KΩ)

Negative

Resistance(20KΩ)

7.2 6.03

2 PIF signal input 2

3 RFAGC start-control level adjust

3.23

0.99

7.2

6.7

5.99

5.85

4 PLL APC filter

5 Audio AGC filter

2.53

3.29

7.9

7.8

6.3

6.17

6 Audio output (NTSC 4.5MHz) 2.34 5.86

7 Filter

8 1/2VCC comparison voltage bias

1.79

0

7.9

∞

2.18 7.6

6.29

∞

6.09

10

11

Second SIF signal output

Second SIF signal input

13 AGC signal output 3.05 7.9

14 External connection for VCO oscillating LC network 2.76 7

15 External connection for VCO oscillating LC network 2.76 7

16 Ground

2.03

2.81

7.7

5.2

0.04

18 Supply voltage input terminal

0 0.001

3.13 7.9

8 2.1

6.17

4.99

6.1

6.2

6

6

0.00

6.11

2.7

19 SIF signal input

20 SIF signal input?

3.2

3.2

2.1

7

6.27

6.27

57

SERVICE MANUAL

Table 17 Ground Resistance

of TMPA8801PSBNG Pins

Pin No

Resistance

31.70KΩ 31.70 KΩ 0

Pin No

Resistance

44.31 KΩ 0 17.56 KΩ

Pin No

Resistance

0.66 KΩ 39.81

Pin No

Resistance

24.70 KΩ 24.67 KΩ

Pin No

Resistance

0.56 KΩ 24.70

Pin No

Resistance

3.29 KΩ 24.27 KΩ 362.3 KΩ >2000 0

Pin No

Resistance

20.1 KΩ >2000 KΩ

Pin No

Resistance

13.6 KΩ 0.5

Pin No

Resistance

0.5 KΩ 1217

0

0

0 0

Pin No

Resistance

52 KΩ 60

Pin No

Resistance

61 62 63 64

56.6 KΩ 83 KΩ

Note: Measured when Power-off

58

SERVICE MANUAL

Table 18 Operating Voltage of TMPA8801PSBNG (N201)’s Pins

5V 5V 5.2V GND 5V 2.3V

7 8 9 10 11 12

2.3V GND 5V GND GND 1V

13 14 15 16 17 18

1.6V 6V 4.2V 4.8V 8.4V 2.0V

19 20 21 22 23 24

2.4V 2.4V 2.4V GND 0V 2.3V

25 26 27 28 29 30

31 32 33 34 35 36

37 38 39 40 41 42

2.2V 4.4V 4.2V GND 1.7V 1.7V

43 44 45 46 47 48

4.2V 5V 1.2V 1.8V 2.5V GND

49 50 51 52 53 54

55 56 57 58 59 60

5V 0V 5V 5V 5V 4.9V

61 62 63 64

4.1V 5V 5V 0V

Pin No.

Table 19 Functions and Service Data of LA78040/78041 Pins

GDM8145 Multimeter

Function Description

Ground Resistance (KΩ)

Voltage of

Pin (V)

Measure with red probe while grounding black probe.

Measure with black probe while grounding red probe.

0 0 0 1

Ground

2

Vertical output terminal

3 Pump supply voltage input

4 In-phase input terminal

5 Inverting input terminal

6 Supply voltage

7

Pump supply voltage output/vertical flyback pulse output

9.73 0.58

24.88

∞

2.22 1.30

2.22 4.58

24.13 1.55

2.61 7.09

0.58

∞

1.30

4.55

1.55

5.93

59

SERVICE MANUAL

REPLACEMENT OF PARTS

1. DESCRIPTION

Many electrical and mechanical components in this chassis have special safety-related characteristics. Components which have these special safety characteristics in this manual and its supplements are identified by the international hazard symbols or UL, FCC, FDA or VDE marking on the circuit diagram and parts list. When replacing any of these components, substitute the one which has the same safety characteristics as specified in the manual.

Description of the special markings:

A:

The components identified by the A marking have special safety-related characteristics.

AE:

The components identified by the AE marking are listed by EMC and have special safety-related characteristics.

CB

: The components identified by the CB marking have been evaluated to the CB standard.

E:

The components identified by the E marking are listed by EMC

G

: The components identified by the G marking have critical characteristics.

Z

: The components identified by the Z marking have important characteristics.

60

CIRCUIT DIAGRAM FOR 21E88

Final Assembly Diagram for 21E88

1 1 80 80 XP XP

FINAL WIRING DIAGRAM FOR 21E88

PRINTED CIRCUIT BOARD DIAGRAM (1)

PRINTED CIRCUIT BOARD DIAGRAMS (2)

PRINTED CIRCUIT BOARD DIAGRAMS 3

JUC7.820.820