Daewoo L500B1 Service manual

Service Manual

XGA COLOR MONITOR

Model : L500B1

DAEWOO ELECTRONICS CO., LTD.

http : //svc.dwe.co.kr

November, 2000

CONTENTS

SAFETY PRECAUTIONS

GENERAL SAFETY INFORMATION

SERVICING PRECAUTIONS

TECHNICAL INFORMATION

GENERAL INFORMATION

PIN CONNECTOR

CAUTIONS FOR ADJUSTMENT AND REPAIR

OPERATION & ADJUSTMENT

ALIGNMENT PROCEDURE

TROUBLESHOOTING HINTS

BLOCK DIAGRAM

PCB LAYOUT

SCHEMATIC DIAGRAM

EXPLODED VIEW & MECHANICAL PARTS LIST

INFORMATION OF PART DESCRIPTION

ELECTRICAL PARTS LIST

15

22

23

27

28

9

14

8

8

29

30

3

6

7

1

2

SAFETY PRECAUTIONS

CAUTION: No modifications of any circuits should be attempted. Service work should be performed only after you are thoroughly familiar with all of the following safety checks and servicing guidelines.

◆ Safety Check

Care should be taken while servicing this analog color display because of the high voltages used in the deflection circuits. These voltages are exposed in such areas as the associated flyback and yoke circuits.

◆ Fire & Shock Hazard

• Insert an isolation transformer between the analog color display and AC power line before servicing the chassis.

• When servicing, pay close attention to the original lead dress especially in the high voltage circuit area; if a short circuit is found, replace all parts which have been overheated as a result of the short circuit.

• All the protective devices must be reinstalled per original design.

• Soldering must be inspected for possible cold solder points, frayed leads, damaged insulation, solder splashes or sharp solder points. Be certain to remove all foreign materials.

◆ Implosion Protection

Picture tube in this monitor employs intergral implosion protection system, but care should be taken to avoid damage and scratching during installation.

Only use same type replacement picture tubes.

IMPORTANT SAFETY NOTICE: There are special components used in this analog color display, which are important for safety. These parts are shaded on the schematic diagram and on the replacement parts list. It is essential that these critical parts should be replaced with manufacturer’s specified parts to prevent X-Ray, shock, fire or other hazards. Do not modify the original design without getting written permission from DAEWOO ELECTRONICS CO. or this will void the original parts and labor warranty.

◆ X-Ray

WARNING: The only potential source of X-Ray is the picture tube. However when the high voltage circuitry is operating properly, there is no possibility of an X-Ray problem. The basic precaution which must be exercised is to keep the high voltage at the following factory recommended level.

NOTE: It is important to use an accurate, periodically, calibrated high voltage meter.

• To measure the high voltage, use a high-impedance high-voltage meter.

Connect(-) to chassis and (+) to the CRT anode button.

• Turn the Contrast & Brightness Control fully counterclockwise.

• Measure the high voltage. The high voltage meter should indicate the following factory recommended levels.

• If the upper meter indication exceeds the maximum level, immediate service is required to prevent the possibility of premature component failure.

• To prevent X-Ray possibility, it is essential to use the specified picture tube.

• The normal high voltage is 25.5KV or below and must not exceed 29KV at zero beam current at rated voltage.

1

GENERAL SAFETY INFORMATION

◆ Terms in the manual

CAUTION Statements identify conditions or practices that could result in damage to the equipment or other property.

WARNING Statements identify conditions or practices that could result in personal injury or loss of life.

◆ Terms as marked on equipment

CAUTION Statements indicate a personal injury hazard not immediately accessible as one reads the marking or a hazard which is properly included on the equipment itself.

WARNING Statements are clearly concerning indicated personal injury hazards.

◆ Symbols in the manual

The symbols indicate where applicable cautionary or other information is to be found.

◆ Symbols as marked on equipment

Protective GROUND terminal

◆ High Voltage Warning

And Critical Component Warning Label

The following warning label is on the CRT PWB shield case inside the unit.

Warning: This product includes critical mechanical and electrical parts which are essential for x ray protection. For continued safety, replace critical components that are indicated in the service manual with exact replacement parts given in the parts list.

Operating high voltage with this product is 29Kv at minimum brightness. Refer to service manual for measurement procedures and proper service adjustments.

2

SERVICING PRECAUTIONS

CAUTION: Before servicing instruments covered by this service manual, its supplements, and addendum, please read and follow the SAFETY PRECAUTIONS of this manual.

NOTE: If unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions on page 1 of this manual, always follow the safety precautions.

Remember: Safety First.

◆ General Servicing Precautions

1. Always unplug the AC power cord from the AC power source before: a. Removing or reinstalling any component, circuit board, module, or any other instrument assembly.

b. Disconnecting or reconnecting any electrical plug or other electrical connection.

c. Connecting a test substitute in parallel with an electrolytic capacitor in the instrument.

CAUTION: A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in a explosion.

d. Discharging the picture tube anode.

2. Test high voltage only by measuring it with an appropriate high voltage meter or other voltage measuring device (DVM, FETVOM. etc.) equipped with a suitable high voltage probe. Do not test high voltage by “drawing an arc”.

3. Discharge the picture tube anode only by: (a) first connecting one end of an insulated clip lead to the degaussing or line grounding system shield at the point where the picture tube socket ground lead is connected, and then (b) touching the other end of the insulated clip lead to the picture tube anode button, using an insulating handle to avoid personal contact with high voltage.

4. Do not any spray chemicals on or near this instrument, or any of its assemblies.

5. Unless otherwise specified in this service manual, only clean electrical contacts by applying the following mixture to the contacts with a pipe cleaner, cotton-tipped stick, or comparable nonabrasive applicator: 10% (by volume) Aceton and 90% (by volume) isopropyl alchohol (90%-99% strength).

CAUTION: This is a flammable mixture. Unless specified in this service manual, lubrication of contacts is not required.

6. Do not damage any plug/socket B+ voltage interlocks with which instruments covered by this service manual might be equipped.

7. Do not apply AC power to this instrument and/or any other of its electrical assemblies unless all the solid-state device heat sinks are correctly installed.

8. Always connect the test instrument ground lead to the appropriate instrument chassis ground before connecting the test instrument positive lead. Always remove the test instrument ground lead last.

9. Only use the test fixtures specified in this service manual with this instrument.

CAUTION: Do not connect the test fixture ground strap to any heatsink in this instrument.

3

◆ Electrostatically Sensitive (ES) Devices

Some semiconductor (solid state) devices can be damaged easily by static electricity.

Such components are commonly called Electrostatically Sensitive (ES) Devices.

The typical examples of ES devices are integrated circuits, some field-effect transistors, and semiconductor “chip” components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity.

1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, wipe off any electrostatic charge on your body by touching any known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device which should be removed for potential shock reasons prior to applying power to the unit under testing conditions.

2. After removing the electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil to prevent electrostatic charge buildup or exposure to the assembly.

3. Only use a grounded-tip soldering iron to solder or unsolder ES devices.

4. Only use an anti-static type solder removal device. Some solder removal devices not classified as “antistatic” can generate enough electrical charges to damage ES devices.

5. Do not use freon-propelled chemicals. These can generate enough electrical charges to damage ES devices.

6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil, or comparable conductive material).

7. Immediately before removing the protective material from the leads of replacement ES devices, touch the protective material to the chassis or circuit assembly into which the device will be installed.

CAUTION: Be sure that no power is applied to the chassis or circuit, and observe all other safety precautions.

8. Minimize bodily movements when handling unpackaged replacement ES devices. (Otherwise harmful motion such as the brushing together clothes fabric or the lifting your foot from a carpeted floor can generate enough static electricity to damage ES devices).

◆ General Soldering Guidelines

1. Use a grounded-tip, low-wattage soldering iron with appropriate tip size and shape that will maintain tip temperature between a 550°F-660°F (288°C-316°C) range.

2. Use an appropriate gauge of RMA resin-core solder composed of 60 parts tin/40 parts lead.

3. Keep the soldering iron tip clean.

4. Throughly clean the surface to be soldered. Use a small wire-bristle (0.5 inch or 1.25cm) brush with a metal handle. Do not use freon-propelled spray-on cleaners.

5. Use the following soldering technique: a. Allow the soldering iron tip to reach normal temperature (550°F to 660°F or 288°C to 316°C) b. Hold the soldering iron tip and solder strand against the component lead until the solder melts.

c. Quickly move the soldering iron tip to the junction of the component lead and the printed circuit foil, and hold it there until the solder flows onto and around both the component lead and the foil.

d. Closely inspect the solder area and remove any excess or splashed solder with a small wire-bristle brush.

4

FIGURE 1. USE SOLDERING IRON TO PRY LEADS

◆ IC Removal/Replacement

Some utilized chassis circuit boards have slotted (oblong) holes through which the IC leads are inserted and then bent flat against the circuit foil. When holes are slotted, the following technique should be used to remove and replace the IC. When working with boards using the familiar round hole, use the standard technique as outlined in paragraphs 5 on the page under the title of general soldering guidelines.

◆ Removal

1. Desolder and straighten each IC lead in one operation by gently prying up on the lead with the soldering iron tip as the solder melts.

2. Draw away the melted solder with an anti-static suction-type solder removal device (or with desoldering braid before removing the IC.

◆ Replacement

1. Carefully insert the replacement IC in the circuit board.

2. Carefully bend each IC lead against the circuit foil pad and solder it.

3. Clean the soldered areas with a small wire-bristle brush. (lt is not necessary to reapply acrylic coating to the area).

◆ “Small-Signal” Discrete Transistor Removal/Replacement

1. Remove the defective transistor by clipping its leads as close as possible to the component body.

2. Bend the ends of each of three leads remaining on the circuit board into a “U” shape.

3. Bend the replacement transistor leads into a “U” shape.

4. Connect the replacement transistor leads to the corresponding leads extending from the circuit board and crimp the “U” with long nose pliers to ensure metal-to-metal contact, then solder each connection.

◆ Power IC, Transistor or Devices Removal/Replacement

1. Heat and remove all solders from the device leads.

2. Remove the heatsink mounting screw (if applicable).

3. Carefully remove the device from the circuit board.

4. Insert new device in circuit board.

5. Solder each device lead and then clip off excess lead.

6. Replace heatsink.

5

◆ Diode Removal/Replacement

1. Remove defective diode by clipping its leads as close as possible to diode body.

2. Bend the two remaining leads perpendicularly to the circuit board.

3. Observing diode polarity, wrap each lead out of the new diode around the corresponding lead on the circuit board.

4. Securely crimp each connection and solder it.

5. Inspect the solder joints of the two “original” leads on the circuit board copper side. If they are not shiny, reheat them and apply additional solder if necessary.

TECHNICAL INFORMATION

Panel Size

Pixel Pitch

Synchronization

Plug and Play

Power Saving

Power Source

Power Consumption

Horizontal

Vertical

Dimension-W x H x D(net/gross)

Weight(net/gross )

Tilt/Swivel Range Tilt

Swivel

Operating Temperature

15.1-inch (38cm) diagonol

0.3 x 0.3 mm

30 - 62 KHz

50 - 85 Hz

DDC1/2B/CI

EPA, VESA DPMS, Nutek Compliant

100-240 Vac, 50/60Hz (Free Voltage)

DC12V, 3A

21W(without adapter)/26W(with adapter)

390 x 401.5 x 73.5mm /502 x 502 x 242mm

4.5/6.4 Kg

9.9/14.1lbs

5° forward, 30° backward

± 90° leftward, rightward

10 ~ 40°C /50 ~ 104°F

6

GENERAL INFORMATION

This TFT LCD monitor automatically scans all horizontal frequencies from 30KHz to 62KHz, and all vertical frequencies from 50Hz to 85Hz. This TFT LCD monitor supports IBM PC, PC/XT, PC/AT, personal

System/2 (PS/2), Apple Macintosh, and compatible users crisp text and vivid color graphics display when using the following graphics adapters : (VGA, Super VGA, VESA and XGA and Apple Macintosh Video

Card). And so, this TFT LCD monitor has a maximum horizontal resolution of 1024 dots and a maximum vertical resolution of 768 lines for superior clarity of display.

By accepting analog signal inputs which level is zero to 0.7 Volts. This TFT LCD monitor can display and

262, 144 colors depending on the graphics adapter and software being used. (available used to 8 bit panel is

16.7M colors)

◆ Abbreviations

ADJ

AFC

CRT

Def

D.Y

HVG

H.SYNC

OSC

P.S.U

PWA

R.G.B

V.Sync

Adjustment

Automatic Frequency Control

Cathode Ray Tube

Deflection

Deflection Yoke

High Voltage Generator

Horizontal Synchronization

Oscillator

Power Supply Unit

Printed Circuit Board Wiring Assembly

Red, Green, Blue

Vertical Synchronization

7

PIN CONNECTOR

Pin Signal

12

13

14

15

8

9

10

11

6

7

4

5

1 Red

2 Green

3 Blue

GND

GND

GND - Red

GND - Green

GND - Blue

+ 5Vdc

GND - H.Sync

GND - V.Sync

Bi-directional Data (SDA)

Horizontal Sync

Vertical Sync (VCLK)

Data Clock (SCL)

1

6 10

15

Arrangement of 15-pin D-sub connector

CAUTIONS FOR ADJUSTMENT AND REPAIR

• Degaussing is always required when adjusting purity or convergence.

• The white balance adjustment has been done by a color analyzer in factroy. The adjustment procedure, described in the service manual is made by a visual check.

• Allow 20 minutes warm-up time for the display before checking or adjusting only electrical specification or function.

• Reform the leadwire after any repair work.

◆ Caution For Servicing

• In case of servicing or replacing CRT, high voltage sometimes remains in the anode of the CRT.

Completely discharge high voltage before servicing or replacing CRT to prevent a shock to the serviceman.

8

OPERATION & ADJUSTMENT

Control Panel

AUTO EXIT MENU BRIGHTNESS

AUTO

•

The AUTO button launches the AUTO TRACKING function directly.

EXIT •

The EXIT button turns the OSD (On-Screen Display) window off.

•

This button moves from sub menu to top menu in the OSD window.

MENU •

The MENU button turns the OSD window on.

•

This button moves from top menu to sub menu in the OSD window.

BRIGHTNESS

•

The button moves cursor to the left or high window in the OSD window.

•

This button decreases the value of any selected function.

BRIGHTNESS

•

The button moves cursor to the right or low window in the OSD window.

•

This button increases the value of any selected function.

Hot Key

AUTO BRIGHTNESS

AUTO TRACKING

9

Key Process

MENU

EXIT

OSD OFF

MENU

EXIT

MENU

EXIT

10

Adjustment Procedure

Is the mode

1024x768?

No

Adjust the FIT

SCREEN.

Yes

Is the H.Size

proper?

Yes

Is the noise displayed on the screen?

Yes

Perform the AUTO

TRACKING.

Is the noise displayed on the screen yet?

Yes

Adjust the CLOCK

FINE until the screen is cleared.

No

No

No

Yes Is the noise displayed on the screen yet?

No

End

Adjust the CLOCK control.

Perform the AUTO

POSITION.

11

OSD Functions

ICON CONTROL

LANGUAGE

FUNCTIONS

Select language for OSD (5 languages).

CLOCK

CLOCK FINE

COLOR TEMP

RED CONTROL

Adjust the width (horizontal size) of the screen image.

Sharpen the focus by aligning the illuminated pixels and adjust until the screen image looks focused, crisp and sharp. Adjusting the CLOCK

FINE after the CLOCK adjustment will produce a clear screen.

Choose different preset color temperatures or set your own customized color parameters.

Adjust the red color.

R

G

B

GREEN CONTROL Adjust the green color.

BLUE CONTROL Adjust the blue color.

H. CENTER &

V. CENTER

FIT SCREEN

Adjust the position of the display horizontally(left or right) and vertically

(up or down).

Make characters of displayed text easier to read (only for resolutions lower than 1024x768).

SMART SCALING Adjust the display image quality (if the screen proceed to scaling up).

AUTO TRACKING Adjust the horizontal & vertical picture image quality and size.

OSD

TIME OUT

Adjust the display OSD Menu.

STATUS Display horizontal & vertical frequency and polarity.

RECALL Reset the screen to the Factory Preset Display Settings.

AUTO POSITION

Choose automatically the proper horizontal position and vertical position & size of the screen image.

CONTRAST

Adjust the contrast of image, the difference between light and dark areas on the screen.

12

Self Diagnosis

When the monitor doesn’t display, if you press any key, Self Diagnosis screen is displayed. Self Diagnosis function checks if the status of the monitor is No Signal or Out of range.

No Signal screen is displayed when the D-Sub signal connector is not connected or the status of the monitor is on DPMS mode.

Out of Range screen is displayed when the applied frequency is under or over normal range.

Normal range

(Non-interlaced mode only)

H : 30 - 62 KHz (1024 dot Max)

V : 50 - 85 Hz (768 dot Max)

13

ALIGNMENT PROCEDURE

Standard Check point

1. Power source : 100 - 240Vac, 50/60Hz.

2. Aging : Take at least 20 minutes warm-up time.

3. Signal

Video input : Analog 0.7Vpp 75

Ω terminal positive polarity

Synchronizing : acceptable negative or positive at TTL level

Resolution

Horizontal : 1024 max.

Vertical : 768 max.

Frequency

Horizontal : 30KHz - 62KHz

Vertical : 50Hz - 85Hz (available only non interlace mode)

Adjustment

1. Smart scaling set to 69%.

2. Contrast set to 100%

3. Brightness set to 50%

4. Switching to factory alignment mode

Press power key with Auto key at the power off status.

5. Video level adjustment

Receive stair pattern of 16 step (doesn’t care any mode).

Readjust coarse R, G, B in TDA8752 menu before saturaton point.

6. Set up the tracking

See the user’s manual at page 8th.

7. Switching to user’s mode

*

If turn-off and turn-on then switched to user’s mode.

All of adjusted data stores by fade out of OSD.

14

TROUBLESHOOTING HINTS

1. Abnormal mode detect

Abnormal mode detect

Yes

Is a input

H-sync of ADC correct?

Yes

Is waveform of pin 84 of ADC correct?

Yes

Trouble in Scalier.

No Trouble in the H-sync input circuit.

No Trouble in ADC.

15

2. Trouble in Power on

Is Power LED on or off?

On

Check the output voltage of adapter.

Yes

Is the pulse of pin 7 of -com.

Yes

Off

No

No

Refer to No video or No raster.

Trouble in the adapter.

Trouble in U3 & Q1 and its ambient circuit.

Is 5VS line

normal?

Yes

Check on U1(scalier)

No Trouble in SQ1 and its ambient circuit.

16

3. No Raster

Check the output of Q6 or pin 3 of CN2.

> 2.5

Is 12V plugged in pin 1

of CN2?

Yes

< 2.5

No

Trouble in Q6 or pin 3 of -com.

Check 12V line of CN3.

Is the output of inverter correct?

Yes

Replace a LCD panal.

No

Replace the inverter.

17

4. One color is missing

One color is missing

Yes

Is the OSD color normal?

Yes

No Check the output signal of Scalier.

Is the input signal normal?

No Check the video signal cable or R,G,B

con-ass’y.

Yes

Are the

R,G,B Digital values

(every eight bits) correct on ADC output stage?

Yes

No

Trouble in the soldering of R,G,B data lines

from output of ADC

to pin 41 wafer.

Check the ambient circuit of ADC.

18

5. No Video

Has display image only white?

Yes

Is pin 41 cable of CN6 well connected?

Yes

No

No

Next page.

Connection trouble.

Is pin 1 of Q16 3.3V?

Yes

Check the output of scalier

(pin 70, 99, 100, 101) and soldering of CN6.

No

Check Q16, its ambient circuit and pin 26 of -com.

19

5-1. No Video

Black

Yes

Is OSD normal?

Yes

No

(3) No raster or Check SDRAM.

Is the contrast at its maximum?

Yes

No Set the contrast up to Max.

Is the output of

ADC correct?

Yes

Next Page.

Yes

Is the output of Scalier correct?

Yes

Check the LCD panel or pin 41 wafer and con-ass’y.

No

No

No

Check the video input signal.

Is the input of

ADC correct?

Yes

Replace the main board

(or replace ADC).

Is the input of

Scalier correct?

Yes

No

Replace the main board

(or replace ADC).

20

6. Broke graph

Is clock of SDRAM pin 35 correct?

Yes

No

Is 3.3V plugged in

VCC pin of SDRAM?

Yes

After checking the soldering between SDRAM and Scalier, if O.K., replace the SDRAM.

No

Check Scalier pin 135.

Check 3.3V line.

21

From PC

L500B1 BLOCK DIAGRAM

15pin DSUB -Connector

H/V sync

RGB signal

PRE-AMP TDA8752

Main Borad

Mx88LC284FC

SDRAM (16Mbit*2)

MIU

Buffer

74ACT14

ADC

Offset/Corse clk

Hs,Vs

Controller

PLL

-Clock timing& phase

-Current &resistance

RED (8)

Green(8)

Blue(8)

Dot clk

Scaling

Dithering

CPU I/F address/data line

Odd/

Even

MUX

OSD Mux

I2C

DDC I2C

Hsync,Vsync EEPROM

24C08

I2C

Micom

Red(6)

Green(6)

Blue(6)

Hs,Vs,DE,LCLK

Dimming

12V/ On-Off

12V

AC IN(100 ~ 230V) 12V(3A)Adapter

DC-DC converter& on-off control

3.3V/5V/12V panel

Panel S,G Driver

Back light

630VAC/ 62khz

DC-AC Inverter

Control Board

PCB LAYOUT

Main PCB Component Side

23

Main PCB Solder Side

24

Control PCB Component Side Control PCB Solder Side

25

D-sub PCB Component Side

D-sub PCB Solder Side

26

SCHEMATIC DIAGRAM

27

EXPLODED VIEW & MECHANICAL PARTS LIST

28

INFORMATION OF PART DESCRIPTION

Important Safety Notice

Components identified with the International Symbol have special characteristics important for safety.

When replacing any components, use only manufacturer’s specified parts.

Abbreviation of Description

RESISTOR Description

F

J

K

M

G

Tolerance

± 1%

± 5%

± 10%

± 20%

± 2%

Example:

Fig &

Index

R101

R30

Part No Description

Resistors

RD-4Z820J Carbon : 82J

HRFS472JBA Chip 4.7K OHM J

CAPACITOR Description

C

D

F

J

K

P

Z

Tolerance

± 0.25pF

± 0.5%

± 1pF

± 5%

± 10%

± 100% ~ 0%

± 80% ~ –

Example:

Fig &

Index

Part No Description

Capacitors

C28 HCFK104ZBA Chip Cera 50V Z

C63 HCBK393KBA Chip Cera 50V K

C44 HCQK102JBA Chip Cera 50V J

29

ELECTRICAL PARTS LIST

The components identified by mark have special characteristics important for safety and x-ray radiation.

These should be replaced only with the types specified in the parts list.

LOC PART-CODE PART-NAME PART-DESC

00030 9970800035 CABLE SIGNAL AS 15P+15P/DDC=1.5M(GY275A)

00040 W1112B831CORD POWER CML-100 1.8M BK(AME)

!

01000 9979800550

AD1

C1

9979720013

PCB CONTROL T=1.6*246*122

ADAPTER POWER LSE9802B1240(DC12V/3.3A)

HCFK104ZBA C CHIP CERA 50V Y5V 0.1MF Z 1608

C10 HCFK104ZBA C CHIP CERA

C100 HCQK221JBA C CHIP CERA

50V Y5V 0.1MF Z 1608

50V CH 220PF J 1608




C104 HCFD105ZBA C CHIP CERA

C106 HCEKF100MC C CHIP ELECTRO

















C125 HCENH101MD C CHIP ELECTRO

C126 HCEKK109MC C CHIP ELECTRO

















50V CH 220PF J 1608

50V CH 220PF J 1608

50V Y5V 0.1MF Z 1608

Y5V 10V 1MF Z 1608

MV 16V 10MF D4.0XH5.2

MV 16V 10MF D4.0XH5.2

50V Y5V 0.1MF Z 1608

MV 16V 10MF D4.0XH5.2

MV 16V 10MF D4.0XH5.2

MV 16V 10MF D4.0XH5.2

MV 16V 10MF D4.0XH5.2

MV 16V 10MF D4.0XH5.2

MV 16V 10MF D4.0XH5.2

MV 16V 10MF D4.0XH5.2

MV 16V 10MF D4.0XH5.2

MV 16V 10MF D4.0XH5.2

50V Y5V 0.1MF Z 1608

MV 16V 10MF D4.0XH5.2

MV 16V 10MF D4.0XH5.2

MV 16V 10MF D4.0XH5.2

MV 16V 10MF D4.0XH5.2

MV 25V 100MF D8.0XH6.3

MV 50V 1MF D4.0XH5.2

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608




















C45 HCFF474ZBA C CHIP CERA
















C60 HCBK393KBA C CHIP CERA












50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V CH 22PF J 1608

50V CH 22PF J 1608

50V CH 47PF J 1608

50V CH 33PF J 1608

50V CH 1000PF J 1608

Y5V 16V 0.47MF Z 1608

50V CH 12PF J 1608

50V CH 1000PF J 1608

Y5V 16V 0.47MF Z 1608

50V CH 12PF J 1608

50V Y5V 0.1MF Z 1608

50V CH 1000PF J 1608

Y5V 16V 0.47MF Z 1608

50V CH 12PF J 1608

Y5V 16V 0.47MF Z 1608

50V CH 1000PF J 1608

50V CH 15PF J 1608

50V Y5V 0.1MF Z 1608

50V CH 1000PF J 1608

50V CH 150PF J 1608

50V Y5V 0.1MF Z 1608

50V X7R 0.039MF K 1608

50V CH 1000PF J 1608

50V Y5V 0.1MF Z 1608

50V X7R 0.01MF K 1608

50V X7R 0.01MF K 1608

50V X7R 0.01MF K 1608

50V X7R 0.022MF K 1608

50V X7R 0.01MF K 1608

50V X7R 0.022MF K 1608

50V X7R 0.01MF K 1608

50V Y5V 0.1MF Z 1608

50V X7R 0.022MF K 1608

30
































50V X7R 0.01MF K 1608

50V X7R 0.022MF K 1608

50V X7R 0.01MF K 1608

50V X7R 0.022MF K 1608

50V X7R 0.01MF K 1608

50V X7R 0.022MF K 1608

50V Y5V 0.1MF Z 1608

50V CH 1000PF J 1608

50V CH 1000PF J 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V CH 1000PF J 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V CH 1000PF J 1608

50V Y5V 0.1MF Z 1608

50V CH 1000PF J 1608

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V CH 22PF J 1608

50V CH 22PF J 1608

50V CH 120PF J 1608

50V CH 120PF J 1608

50V Y5V 0.1MF Z 1608

50V CH 220PF J 1608

50V CH 12PF J 1608

50V CH 12PF J 1608

50V Y5V 0.1MF Z 1608


CN10 9979220022 CONN WAFER

CN11 9979200209

CN12 9979100010

D-SUB 15P ANGLE

JACK DC

50V CH 220PF J 1608

SMAW250-07 (ANGLE)

15P DDC BLUE W/IN SCREW

POWER JACK 6.5PIE 14.5*9

CN1A 9970740044

CN2A 9970750035

CN3A 9970730072

CN4A 9970760045

CONN AS

CONN AS

CONN AS

CONN AS

SMH250-04+YBNH200-05=270

5264-05+YBNH200+1007=110

SMH250+YBNH200+1354=250

SMH250+YBNH200+2464=120

CN5A 9970770030

CN6 9979220080

CN7 9979220019

CN8 9979220018

CN9 9979220021

D2 DRLS4148--

D3 DRLS4148--

D4 DRLS4148--

CONN AS

CONN WAFER

CONN WAFER

CONN WAFER

CONN WAFER

DIODE CHIP

DIODE CHIP

DIODE CHIP

SMH250+YBNH200+1354=180

DF9B-41P-1V(22)

SMAW250-04 (ANGLE)

SMAW250-03 (ANGLE)

SMAW250-06 (ANGLE)

RLS4148

RLS4148

RLS4148

D5 DRLS4148-DIODE CHIP

EF1 5PF1BH471M FILTER LC

!

INV1 DBA11502-LCD INVERTER

RLS4148

CFI-06-B-1H-471M

BAI-1502


L1 HFFTB2601B COIL CHIP BEAD




L2

L3

HFFTB2601B

HFFTB2601B

COIL CHIP BEAD

COIL CHIP BEAD

L4

L5

L6

L7

HFFTB2601B COIL CHIP BEAD




L8

L9



LCD DLM151X2C2 LCD

LED1 DSD50GYW-LED

OUTA 9970741001

PCB1 9979800549

CONN AS

PCB MAIN

Q1 TZTC3198YTR

Q10 DKDS226RTK DIODE CHIP





Q4

Q5

Q6

Q7


Q16 TNDS9958-FET CHIP

Q2

Q3

TKTC3875SY

TKTC3875SY

TR CHIP

TR CHIP

TKTC3875SY

TKTC3875SY

TKTC3875SY

TKTC3875SY

TR CHIP

TR CHIP

TR CHIP

TR CHIP

Q9

R1

DKDS226RTK DIODE CHIP

HRFS472JBA R CHIP

R10 HRFS513JBA R CHIP

















KDS226(RTK)

1/16 4.7K OHM J 1608

1/16 51K OHM J 1608

1/16 5.1K OHM J 1608

1/16W 22 OHM J 1608

1/16W 22 OHM J 1608

1/16 4.7K OHM J 1608

1/16 4.7K OHM J 1608

1/16W 75 OHM J 1608

1/16W 75 OHM J 1608

1/16 100 OHM J 1608

1/16W 75 OHM J 1608

1/16 4.7K OHM J 1608

1/16 4.7K OHM J 1608

1/16 100 OHM J 1608

1/16 1K OHM J 1608

1/16 1K OHM J 1608

1/16 15K OHM J 1608

1/16 1K OHM J 1608

TB321611Z260

TB321611Z260

TB321611Z260

TB321611Z260

TB321611Z260

TB321611Z260

TB321611Z260

TB321611Z260

TB321611Z260

TB321611Z260

TB321611Z260

TB321611Z260

LM151X2-C2TH

SD50GYW(GREEN/AMBER)

DF-9-41S*2+1571#32=220

T=1.6*180*140

KTC3198Y-(1815Y) (AUTO)

KDS226(RTK)

KDS226(RTK)

KDS226(RTK)

KDS226(RTK)

KDS226(RTK)

KDS226(RTK)

NDS9958

KTC3875SY(RTK)

KTC3875SY(RTK)

KTC3875SY(RTK)

KTC3875SY(RTK)

KTC3875SY(RTK)

KTC3875SY(RTK)

31












































R7

R8

HRFS472JBA R CHIP

HRFS472JBA R CHIP

R80 RD-AZ302JR CARBON FILM





1/16 1M OHM J 1608

1/16 4.7K OHM J 1608

1/16 0 OHM J 1608

1/16 4.7K OHM J 1608

1/16 4.7K OHM J 1608

1/16 4.7K OHM J 1608

1/16 4.7K OHM J 1608

1/16 4.7K OHM J 1608

1/16 100 OHM J 1608

1/16 220 OHM J 1608

1/16 100 OHM J 1608

1/16 220 OHM J 1608

1/16 22K OHM J 1608

1/16 100 OHM J 1608

1/16 100 OHM J 1608

1/16 4.7K OHM J 1608

1/16 4.7K OHM J 1608

1/16 4.7K OHM J 1608

1/16 1K OHM J 1608

1/16 4.7K OHM J 1608

1/16 4.7K OHM J 1608

1/16 4.7K OHM J 1608

1/16 4.7K OHM J 1608

1/16 1M OHM J 1608

1/16 4.7K OHM J 1608

1/16 100 OHM J 1608

1/16 100 OHM J 1608

1/16 4.7K OHM J 1608

1/16 4.7K OHM J 1608

1/16 4.7K OHM J 1608

1/16 2.2K OHM J 1608

1/16 2.2K OHM J 1608

1/16 4.7K OHM J 1608

1/16 100 OHM J 1608

1/16 1K OHM J 1608

1/16 4.7K OHM J 1608

1/16 100 OHM J 1608

1/16 4.7K OHM J 1608

1/16 4.7K OHM J 1608

1/16 47K OHM J 1608

1/16 1K OHM J 1608

1/16 4.7K OHM J 1608

1/16 4.7K OHM J 1608

1/16 4.7K OHM J 1608

1/6 3K OHM J

1/6 6.8K OHM J

1/6 15K OHM J

1/6 30K OHM J

1/6 62K OHM J

32



RP1 HFFH4H300E COIL CHIP BEAD

RP10 HFFH4M121E COIL CHIP BEAD










SC1 HCFK104ZBA C CHIP CERA

SC10 HCEMF470MD C CHIP ELECTRO

SC11 HCEMH220MD C CHIP ELECTRO



SC14 HCBK103KBA C CHIP CERA


SC16 HCEMF470MD C CHIP ELECTRO



SC19 HCEPF221ME C CHIP ELECTRO


SC20 HCENH101MD C CHIP ELECTRO

SC21 HCENH101MD C CHIP ELECTRO

SC3 HCEKF100MC C CHIP ELECTRO






MV 25V 22MF D6.3XH5.2

MV 25V 22MF D6.3XH5.2

SC9 HCEEH470MD C CHIP ELECTRO

SD1 DSK14----DIODE SCHOTTKY

MV 25V 47MF D6.3XH5.7

SK14

SL1 HFFTB2601B COIL CHIP BEAD




TB321611Z260

TB321611Z260

TB321611Z260

TB321611Z260

SL5 HLC330M00E L CHIP COIL 33UH M (BA330)

SQ1 1K1A78L05F IC REGULATOR CHIP KIA78L05F(RTF)

SQ2 1K1A7805P1 IC REGULATOR

SQ3 1K1A7805P1 IC REGULATOR

KIA7805API

KIA7805API

SQ4 TNDS9435AFET CHIP

SQ5 T2N3904SRT TR CHIP

SR1 HRFS104JBA R CHIP


NDS9435A

2N3904S(RTK)

1/16 100K OHM J 1608

1/16 100K OHM J 1608


SR4 RS01Z330JR M-OXIDE FILM

SR5 RS02Z180JR M-OXIDE FILM

1/16 11K OHM J 1608

1W 33 OHM J (TAPPING)

2W 18 OHM J (TAPPING)

1/16 100 OHM J 1608

HB-4H3216-300JT

HB-4M3216-121JT

HB-4M3216-121JT

HB-4H3216-300JT

HB-4H3216-300JT

HB-4H3216-300JT

HB-4H3216-300JT

HB-4M3216-121JT

HB-4M3216-121JT

HB-4M3216-121JT

HB-4M3216-121JT

50V Y5V 0.1MF Z 1608

MV 16V 47MF D6.3XH5.2

MV 25V 22MF D6.3XH5.2

50V Y5V 0.1MF Z 1608

50V Y5V 0.1MF Z 1608

50V X7R 0.01MF K 1608

50V Y5V 0.1MF Z 1608

MV 16V 47MF D6.3XH5.2

50V X7R 0.01MF K 1608

50V Y5V 0.1MF Z 1608

MV 16V 220MF D8.0XH1.0

50V X7R 0.01MF K 1608

MV 25V 100MF D8.0XH6.3

MV 25V 100MF D8.0XH6.3

MV 16V 10MF D4.0XH5.2

50V Y5V 0.1MF Z 1608

50V X7R 0.01MF K 1608

50V Y5V 0.1MF Z 1608


SU1 1LM2596S33 IC SD REGULATOR LM2596S3.3

SW1 5S50101Z10 SW TACT KPT-1115AM

SW2 5S50101Z10

SW3 5S50101Z10

SW4 5S50101Z10

SW5 5S50101Z10

SW TACT

SW TACT

SW TACT

SW TACT

KPT-1115AM

KPT-1115AM

KPT-1115AM

KPT-1115AM

SW6 5S50101Z10

U1 1MX88L284F

SW TACT KPT-1115AM

IC LCD CONTROLLER MX88L284

U2

U3

1TDA8752BH

1MTV212M--

IC ADC

IC MICOM

TDA8752BH

MTV212MS64U


U9

Y1

Y2

U3A 9979300501

U4 1EM636165T

SOCKET IC

IC SDRAM

U5

U6

U7

U8

1EM636165T

124C08----

IC SDRAM

IC EEPROM

SDIF-42T(1.778)

EM636165TS-8

EM636165TS-8

24C08

1KA7542--IC VOTAGE DETECTOR KA7542

1TC74ACT14 IC TC74ACT14FN

1LM385M25IC VOLTAGE REFERENCE LM385M25

5XJ14R318F CRYSTAL QUARTZ HC-49/S 14.31818MHZ 50PPM

5XJ12R000E CRYSTAL QUARTZ HC-49/S 12.00000MHZ 30PPM

33

DAEWOO ELECTRONICS CO., LTD

686, AHYEON-DONG MAPO-GU

SEOUL, KOREA

C.P.O. BOX 8003 SEOUL, KOREA

TELEX : DWELEC K28177-8

CABLE : "DAEWOOELEC"

E-mail : [email protected]

TEL : 82-32-510-7620

FAX : 82-32-510-7630

Daewoo L500B1 Service manual

Service Manual

XGA COLOR MONITOR

Model : L500B1

DAEWOO ELECTRONICS CO., LTD.

http : //svc.dwe.co.kr

November, 2000

CONTENTS

SAFETY PRECAUTIONS

◆ Safety Check

◆ Fire & Shock Hazard

◆ Implosion Protection

◆ X-Ray

GENERAL SAFETY INFORMATION

◆ Terms in the manual

◆ Terms as marked on equipment

◆ Symbols in the manual

◆ Symbols as marked on equipment

◆ High Voltage Warning

SERVICING PRECAUTIONS

◆ General Servicing Precautions

◆ Electrostatically Sensitive (ES) Devices

◆ General Soldering Guidelines

◆ IC Removal/Replacement

◆ Removal

◆ Replacement

◆ “Small-Signal” Discrete Transistor Removal/Replacement

◆ Power IC, Transistor or Devices Removal/Replacement

◆ Diode Removal/Replacement

TECHNICAL INFORMATION

GENERAL INFORMATION

◆ Abbreviations

PIN CONNECTOR

CAUTIONS FOR ADJUSTMENT AND REPAIR

◆ Caution For Servicing

OPERATION & ADJUSTMENT

Control Panel

Hot Key

Key Process

Adjustment Procedure

OSD Functions

Self Diagnosis

ALIGNMENT PROCEDURE

Standard Check point

Adjustment

TROUBLESHOOTING HINTS

1. Abnormal mode detect

2. Trouble in Power on

3. No Raster

4. One color is missing

5. No Video

5-1. No Video

6. Broke graph

L500B1 BLOCK DIAGRAM

Main Borad

PCB LAYOUT

Main PCB Component Side

Main PCB Solder Side

Control PCB Component Side Control PCB Solder Side

D-sub PCB Component Side

D-sub PCB Solder Side

SCHEMATIC DIAGRAM

EXPLODED VIEW & MECHANICAL PARTS LIST

INFORMATION OF PART DESCRIPTION

Important Safety Notice

Abbreviation of Description

ELECTRICAL PARTS LIST

DAEWOO ELECTRONICS CO., LTD

686, AHYEON-DONG MAPO-GU

SEOUL, KOREA

C.P.O. BOX 8003 SEOUL, KOREA

TELEX : DWELEC K28177-8

CABLE : "DAEWOOELEC"

E-mail : [email protected]

TEL : 82-32-510-7620

FAX : 82-32-510-7630

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