HP L1908W GA19WHBAS, GA19WHANS LCD monitor Service Manual

HP
HP_LCD_L1908W_SM070727V01
Service
Model ID: GA19WHBAS
GA19WHANS
Service Manual
Table of Contents
Important Safety Notice------------------------------------------------------------------------------------- 01
01. Circuit Description------------------------------------------------------------------------------------- 02
02. Packing Exploded Diagram---------------------------------------------------------------------------08
03. Product Exploded Diagram--------------------------------------------------------------------------- 09
04. Assembly and Disassembly Procedures ----------------------------------------------------------- 10
05. Troubleshooting---------------------------------------------------------------------------------------- 18
06. Schematics and Layouts------------------------------------------------------------------------------ 30
Appendix I : User s Manual
Appendix II: Spare Parts List
Safety Notice
Any person attempting to service this chassis must familarize with the chassis and be aware of the
necessary safety precautions to be used when serving electronic equipment
containing high voltage.
Published by LITE-ON Service Printed in Taiwan © All rights reserved Subject to modification
27th-Jul.-2007
Important Safety Notice
HP L1908W
Go to cover page
Product Anouncement:
This product is certificated to meet RoHS Directive and
! Using Lead-Free solder to well mounted the parts.
Lead-Free produced definition. Using approved critical
! The fusion point of Lead-Free solder requested in the
components only is recommended when the situation
to replace defective parts. Vender assumes no liability
express or implied, arising out of any unauthorized
modification of design or replacing non-RoHS parts.
Service providers assume all liability.
Qualified Repairability:
Proper service and repair is important to the safe,
reliable operation of all series products. The service
providers recommended by vender should being
aware of notices listed in this service manual in order
to minimize the risk of personal injury when perform
service procedures. Furtermore, the possibile existed
improper repairing method may damage equipment or
products. It is recommended that service engineers
should have repairing knowledge, experience, as well
as appropriate product training per new model before
performing the service procedures.
NOTICE:
! To avoid electrical shocks, the products should be
connect to an authorized power cord, and turn off the
master power switch each time before removing the
AC power cord.
! To prevent the product away from water or explosed
in extremely high humility environment.
! To ensure the continued reliability of this product,
use only original manufacturer s specified parts.
! To ensure following safty repairing behavior, put the
replaced part on the components side of PWBA, not
solder side.
! To ensure using a proper screwdriver, follow the
torque and force listed in assembly and disassembly
procedures to screw/unscrew screws.
degree of 220 ° C.
1
2
HP L1908W
1. Circuit Description
Go to cover page
1.1 Power Board Operation Theory:
1.17c Regulation:
1.1.1 Line Filter:
If output voltage +22V goes up, the R
It consists of C801, T801, C802, C803, C804,
terminal of I803 gets more bias,
C808, C809, C815, C819, C820, C825, and
accordingly photo transistor and photo
eliminates the high frequency interference to
diode flow more current. The voltage of
meet EMI's requirement.
pin2 goes up too, making the pulse width
1.1.2 Rec & Filter:
of pin6 to become narrower. So the output
Bridge diodes D812, D813, D814, D815 convert
voltage +22V will be pulled down to a
AC source into pulse DC. This pulse DC is
stable value.
smoothed and filtered by C805 and R802 which is
1.1.7d OVP:
an NTC (Negative Thermal Coefficient ) resistor,
If +22.5V goes up too much, the induced
and used to reduce inrush current within safe
voltage on pin4 of T802 becomes large
range.
also. Suppose that voltage is over 20V,
1.1.3 Power Transformer:
the pulse train at pin6 goes down to zero,
T802 converts energy into square wave given by
shutting the Q803 off immediately.
power source C805 as a capacitor-input filter on
1.1.7f SCP:
the secondary winding of bridge rectifier to
If output terminal is short to ground, photo
generate +5V, +12V, and +22V.
transistor does not conduct, hence I802
1.1.4 Output:
does not conduct either. Then oscillation
The square wave from T802 is rectified by D808
of I801 is stop, shutting Q803 off
D809, D810, then filtered by C817, C818, C824,
C823, C830, C833, C822 to generate +22.5V and
+12V, +5V respectively.
1.1.5 Driver:
Power Board Block Diagram
Q803 drive T802 through PWM (Pulse-width
modulation) control of I801 for power converted.
Line Filter
Rec. & Filter
Power
Transformer
PWM
Driver
1.1.6 FeedBack:
Output Rec. &
Filter
Negative feedback CKT consists of a photo
coupler I802 (LTV817) and an adjustable
regulator I803 (TEA1530). This circuitry can
maintain output voltages +22.5V, +12V, and +5V
Feedback
at a stable level.
1.1.7 PWM (Pulse-width modulation) :
1.1.7a Start:
1.2 Inverter Circuit:
When AC power switch is turned on. C807
This unit operates on an output voltage of 22V given by
is charged a 11V and an initial current
power source.
above 40uA flows to pin1 of I801. The I801
starts to oscillate and outputs a pulse train
through its pin6 to drive Q803.
1.1.7b OPP:
When Q803 turns on, C805 supplies a
linearly increasing triangle current
through the primary inductance of T802 to
the driver Q803, once the peak value of
this current multiplied by R811 exceed
0.52V, pulse train will be turn off 0.52V,
pulse train will be turn off immediately to
protect Q803, T802 from being blew out.
1. 2.1 VDD:
R105 gets a +5VDC for I101 power supply.
1.2.2 Control IC, I101 (OZ9938):
1.2.2a Enable:
When pin1 of I101 is over 2V, I101 is
initialized. If it is lower than 1V, the I101
turns off.
3
HP L1908W
1. Circuit Description (continued)
Go to cover page
1.2.2b OSC:
1.2.5 Feedback:
When I101 enabled, C104, R118, R107 (pin13
D116, D117, D120, D121, R111, R130 detect the
of I101) determine the operating frequency.
lamp current for negative feedback and
regulation.
1.2.2c SST:
C106 (pin12 of I101) provides soft start
Inverter Board Block Diagram
function.
1.2.2d Ignition:
VCC
IC provides higher operating frequency
internally for more striking voltage until
VDD
VDD
regulation of feedback of lamp current. And it
Control IC: OZ9938
provides 2 second striking time.
1.2.2e Dimming control:
ON/OFF
The external PWM voltage of R136 and C111
Enable
Output Driver
OSC
Protection
SST
Ignition
Dimming
Control
Regulation
Half-bridge
Switching
Transformer
Lamp
Detection
control the duty pulse of burst-mode to drive
and perform a wide dimming control for the
CCFL. The burst-mode frequency is
Brightness
Control
Feedback
determined by scaler IC.
1.2.2f Regulation:
Pin5 of I101 provides regulation of the CCFL
current from feedback. The non-inverting
reference is at 1.25V nominal.
1.2.2g Protection:
Open-lamp protection in the ignition period is
provided through pin6 of I101. Removal of the
CCFL during normal operation will trigger IC to
turn on and shut off the inverter. This is latch
function.
1.2.2h Output drivers:
The configuration prevents any shoot-through
issue associated with bridge-type power
conversion applications. Adjusting the overlap
conduction between Q104, Q105, the CCFL
current regulation is achieved.
1.2.3 Half-bridge Switching and Transformer:
Q104, Q105, C122, C123, C134 compose half-bridge
switching to convert DC into AC for driver the CCFL.
1.2.4 Detection:
C112, C114, C115, C116, C118, C119, R126, R116,
R115, R117, R119, R121, R122, R125 detect the
output voltage and ensure a rated voltage by pin6 of
I101 ensure not a open-lamp.
1.3 Interface Operation:
1. 3.1 Top (Circuit diagrams sheet 2 of 8):
This page is function block. (1)Power, (2)VGA &
DDC interface, (3)Scaler GM5726H (GM5766H),
(5) Key & panel interface, (6) Audio.
1.3.2 Power (Circuit diagrams sheet 3 of 8):
1.3.2a P301 connector:
A 5V power supply for LCD module, also
it is main power of interface board. A VDD
(+5V) power supply for audio AMP. It is
generated from the P301 connector. And
adjust back light of LCD module from I306
scaler GM5726H (GM5766H) control.
1.3.2b I302, 3-terminal regulator:
A 3.3V power supply for I306 scaler IC
GM5726H (GM5766H) and I308 EEPROM
and I309 SPI flash ROM, it is generated
from the 5V source.
1.3.2c I303, 3-terminal regulator:
A 1.8V power supply for I306 scaler IC
GM5726H (GM5766H) , it is generated
from the 3.3V source (I302).
4
HP L1908W
1. Circuit Description (continued)
Go to cover page
1.3.2d Q302, I301:
1.3.4a P303 connector:
The circuitry is functions of ON/OFF control
P303 is DVI-D connector for DDWG standard,
capable of initial the LCD module power on or
it has digital video signals (TMDS) to I306
shut its power off (PANELVCC_EN) is
scaler IC GM5726H (GM5766H) . The VESA
performed for power ON/OFF and also for the
DDC/CI function is through I2C bus to I306
power saving sequence. It supports 5V to
GM5726H (GM5766H) . And it supports HDCP
LCD module power. The PANELVCC_EN
signal is generated from I306 scaler IC
GM5726H (GM5766H) .
1.3.2e R305:
ON/OFF control for LCD module back light
power ON/OFF control (BKLT_EN) is
function is also through IIC bus to I306.
1.3.4b I305, EDID EEPROM (24LC02B):
The I305 is support EDID information of the
VESA standard for DVI interface, and support
plug & play for the PC host.
1.3.5 Scaler IC (Circuit diagram sheet 6 of 8):
performed for black light power ON/OFF and
The I306 GM5726H (GM5766H) is all-in-one LCD
also for the power saving sequence. The
monitor controller. It leverages Genesis patented
BKLT_EN signal is generated from I306
advanced image-processing technology as well as a
scaler IC .
proven integrated ADC/PLL. Furthermore, it
1. 3.2f Q301, R301, R302, R304:
Adjusting backlight luminance of LCD
integrates HDCP function, a micro-controller, an
OSD controller, and dual LVDS.
module, it s adjusted back light luminance
control (BKLT_ADJ) is performed for the back
The RGB analog video signal from video input circuit
light luminance. The BKLT_ADJ signal is
enter to incorporated A/D converted block (ADC) into
generated from I306 scaler IC GM5726H
the digital data for analog video signal. The TMDS
(GM5766H) .
digital signals input (with HDCP) entered from the
1.3.3 VGA & DDC interface (Circuit diagram sheet 4 of 8):
DVI-D connector is converted into the digital data.
This sheet has RGB analog video and H/V sync
Based on this conversion, this device performs
signals input from VGA connector.The RGB analog
interpolation during pixel extension. These
video signals input through AC-coupled, analog
interpolation digital data are transformed to LVDS
video signal is used to clamp the black level at 0V.
signal. The I306 source voltage is 3.3V and 1.8V, the
And H/V sync to scaler. Support EDID plug & play
device clock source frequency is 14.318 MHz. And
function for analog video. It is to support VESA
support DDC/CI interface of VESA and function key
DDC/CI interface for analog video.
operation.
1.3.3a P302 connector:
1. 3.5a I308 EEPROM (24LC16B):
The RGB analog video and H/V sync input
The control data and parameter, and OSD
signals to I306 scaler Gm5726H (Gm5766H).
related setting, and other service data, to be
The VESA DDC/CI function is through IIC bus
stored in I308. The contents of which are
to I306 scaler IC GM5726H (GM5766H) .
updated as required.
1.3.3b I304, EDID EEPROM (24LC02B):
1.3.5b I309 SPI Flash ROM:
The I304 is support EDID information of the
The firmware program running from I309
VESA standard for VGA interface and support
external SPI flash ROM, contains firmware
plug and play for the PC host.
code and data for all firmware function. The
1.3.4 DVI & DDC interface (Circuit diagrams sheet 5 of 8):
The digital video signals (TMDS) input from P303
DVI-D connector. The digital video signal is TMDS
device is 2Mbits of flash ROM.
1.3.5c I307 Microprocessor Supervisory Circuit:
The function of this device is to assert a reset
for DVI V1.0 standard. And support EDID plug&play
to I306 scaler GM5726H (GM5766H), when
function for digital video. It supports VESA DDC/CI
either the power supply dropped down.
interface, and support HDCP function.
HP L1908W
1. Circuit Description (continued)
5
Go to cover page
1.3.7 Audio (Circuit diagrams sheet 8of 8):
1.3.5d X301 14.318MHz:
It generates reference clock input for I306
1.3.7a P309 connector:
The P309 is audio signal input from the audio
scaler.
source.
1.3.5e ISP and DDC/CI function:
The DDC/CI is VESA standard for the host PC
1.3.7b P310 connector:
system, it can through I2C bus to control LCD
The P310 is audio output to speaker and
monitor. Enter I306 pin64 DDC_SCL_A and
support 2W x 2 speakers.
pin65DDC_SDA_A of the VGA port. Enter I306
1.3.7c I310 TPA6021A4:
pin66 DDC_SCL_D pin67 DDC_SDA_D of the
The I310 is 2x2W stereo audio amplifier, it is
DVI-D port. It use ISP function when change
an integrated class-AB dual output amplifier.
new firmware to I309 SPI flash ROM, it used
1.3.7d Q309:
IIC bus from VGA or DVI-D port through I306
Power down and mute control for Audio
to I309 SPI flash ROM.
ON/OFF control (AUDIO_EN) is performed for
1.3.5f The power save sequence function:
standby mode and mute function. It supports
First I306 pin49 (BKLT_EN) set Low to disable
5V to audio IC power. The AUDIO_EN signal is
LCD module back light power, delay of some
generated from I306.
time, then I306 pin127 (PANELVCC_EN) set
1.3.7e R394, Q310, volume control for Audio:
Low to disable LCD module power, then I306
Volume control (volume) is performed for
enter to power down mode.
audio output signal power. The volume signal
1.3.6 Key & Panel interface (Circuit diagrams sheet 7of 8):
is generated from I306.
1.3.8 Others:
1.3.6a P306 connector:
It is LVDS bus, it is from I306 scaler to LCD
panel module. The P306 output voltage is 5V.
1.3.8a Detection of POWER ON status:
The I306 is identified the ON status of two
modes for the power supplies. The
1.3.6b P307 and P308 connector:
The P307/P308 has support keypad function.
identification is made when the power supply
Control is given effect for the push switch to be
is turn off. For example, if the power supply is
used when the user changes the parameters,
turn off with the POWER key switch, the
in order to modify the respective setting
POWER key switch must be turn on when
values. Whether the switch has been pressed
active the power supply again. If the power
is identified with the switch input level change
supply turned off by the pulling out the power
of I306. Relate ports of I306 based on Table 1.
cord, then this power supply can to be turned
Each parameter is stored in the I308EEPROM,
on by connecting the power cord, without
the contents of which are updated as required.
The P307 have LED Blue and Amber light, the
LED Blue signal from I306 pin126, and the
LED Amber signal from I306 pin125.
pressing the POWER key switch.
1.3.8b Display mode identification:
(1) Display mode identification:
The display mode of input signal is
identified based on Table 2. When the
mode has been identified through the
measurement of horizontal and vertical
Table 1 Related ports of I306
Pin No. I/O
Signal name
Function
Remarks
Pin 113
I
KEY_POWER Soft power switch input Power key
Pin 115
I
KEY_MENU
Enter OSD switch input Enter OSD menu
Pin 114
I
KEY_UP
Switch input
Up key or Viewing model selection
Pin 115
I
KEY_DOWN
Switch input
Down key or Volume control of audio function
frequencies, the total number of lines is
determined with a formula of Horizontal
frequency and Vertical frequency=Total
number of number of lines . Final
identification can be made by examining
the coincidence of the obtained figure with
the number of lines for the mode identified
from the frequency.
6
HP L1908W
1. Circuit Description (continued)
Go to cover page
The Distinction Hsync and Vsync of each mode is
shown in Table3. When the detected frequency if the
Table 3 the Hsync,Vsync distinction
Indication
sync signal has changed, the total number of lines
should be counted even through it is range identified
frequency in the same mode.
(2) Out of range:
This out of range mode is assumed when the frequency
out of the horizontal/vertical signal is as specified
below.
Vertical frequency : 50 ~ 76 Hz.
Horizontal frequency : 24 ~ 83KHz.
(3) Power save mode:
The power save mode is assumed when the horizontal
and vertical signals are as specified below.
Distinction Hsync
Distinction Vsync
The fixed
640 x 480
30.5KHz≦fH≦32.5KHz
59Hz≦fV≦61Hz
1
640 x 480
36.5KHz≦fH≦38.5KHz
74Hz≦fV≦76Hz
2
720 x 400
30.5KHz≦fH≦32.5KHz
69Hz≦fV≦71Hz
3
800 x 600
36.9KHz≦fH≦38.9KHz
59.3Hz≦fV≦61.3Hz
4
800 x 600
45.9KHz≦fH≦47.9KHz
74Hz≦fV≦76Hz
5
832 x 624
48.7KHz≦fH≦50.7KHz
73.5Hz≦fV≦75.5Hz
6
1024 x 768
47.4KHz≦fH≦49.4KHz
59Hz≦fV≦61Hz
7
1024 x 768
59KHz≦fH≦61KHz
74Hz≦fV≦76Hz
8
1152x720
43.9KHz≦fH≦45.9KHz
59Hz≦fV≦61Hz
9
1152 x 870
67.7KHz≦fH≦69.7KHz
74Hz≦fV≦76Hz
10
1152 x 900
70.7KHz≦fH≦72.7KHz
75Hz≦fV≦77Hz
11
1280x768
46.4KHz≦fH≦48.4KHz
59Hz≦fV≦61Hz
12
resolution
mode
1280x960
59KHz≦fH≦61KHz
59Hz≦fV≦61Hz
13
1280 x 1024
62.9KHz≦fH≦64.9KHz
59Hz≦fV≦61Hz
14
1280 x 1024
79KHz≦fH≦81KHz
74Hz≦fV≦76Hz
15
1440x900
55KHz≦fH≦57KHz
59Hz≦fV≦61Hz
16
1.3.8c Power ON sequence
- If there is no horizontal sync signal input
When the POWER key switch is pressed, the
- If there is no vertical sync signal input.
POWER key switch signal is turned H . When this
- If the horizontal sync signal is outside the measuring
H p otential is detected, the CPU begins to
range of I306.
establish the respective power supplies according
- If the vertical sync signal is outside the measuring
to the sequence show below.
range of I306.
Power Key
296ms
LED Green
PANELVCC_EN
Table 2 video model
Mode
Resolution
825ms
BKLT_EN
H-Freq
(KHz)
Band Width
(MHz)
516ms
Polarity
H
V
-
3.68s
AUDIO_EN
1
640x480 (59.94Hz)
31.469
25.175
-
2
640x480 (75Hz)
37.5
31.5
-
-
3
720x400 (70Hz)
31.469
28.322
-
+
4
800x600 (60Hz)
37.879
40
+
+
5
800x600 (75Hz)
46.875
49.5
+
+
6
832x624 (74.55Hz)
49.722
57.284
+/-
+/-
7
1024x768 (60Hz)
48.363
65
-
-
the CPU begins to turn off the respective power
8
1024x768 (75Hz)
60.023
78.75
-
-
supplies according to sequence show below.
9
1152x864 (60Hz)
44.86
66.75
-
+
10
1152x870 (75Hz)
68.68
100
+/-
+/-
11
1152x900 (65Hz)
61.80
92.978
+/-
+/-
12
1280x768 (60Hz)
47.396
68.25
+
-
13
1280x960 (60Hz)
60.00
108.00
+/-
+/-
14
1280x1024 (60Hz)
63.981
108
+
+
15
1280x1024 (75Hz)
79.976
135
+
+
16
1440x900 (60Hz)
55.94
106.5
-
+
1.3.8d Power OFF sequence:
When the POWER key switch is pressed, while the
power supply is ON, the POWER key switch signal
is turned H . When this H p otential is detected,
Power Key
140ms
LED Green
460ms
PANELVCC_EN
157ms
BKLT_EN
AUDIO_EN
140ms
7
HP L1908W
1. Circuit Description (continued)
Go to cover page
1. 3.8e List of I/O Pin Assignments of the I306:
Pin No.
Port
Signal Name
Initial
Function
Setting
113
LBADC_IN3
PWR_KEYn
H
ON/OFF LCD monitor
126
GPIO14
LED_B
L
LED Blue enable when is H
125
GPIO13
LED_A
L
LED amber enable when is H
114
LBADC_IN2
KEY_UPn
H
OSD up/plus enable when is 2.46V
115
LBADC_IN1
KEY_MENUn
H
OSD enter enable when is 2.46V
115
LBADC_IN1
KEY_DOWNn
H
OSD down/minus enable when is 2.0V
86
GPIO31
HDCP_HPDn
L
DVI HPD enable when is L
122
GPIO10
SCL
H
EEPROM clock signal of IIC bus
123
GPIO11
SDA
H
EEPROM data signal of IIC bus
50
GPO4
BKLT_ADJ
-
Backlight brightness control
1.3.9b LED Indicator:
Full Power - HP branded models
Sleep - all models
Green
Amber
Sleep Timer activated Sleep Mode
Flashing Amber (0.5 Hz)
1.3.9c Factory Preset Display Modes:
Preset
Pixel
Format
H-Freq
H(kHz) Polarity
V-Freq
(Hz)
VPixel Clk
Polarity (MHz)
Source
124
GPIO12
DDC_WPn
L
DDC EEPROM write protection when is L
1
640 x 480
31.47
-
59.94
-
25.175
51
GPO0
AUDIO_EN
L
Audio enable when is H
2
640 x 480
37.5
-
75
-
31.5
VGA
56
GPO1
VOLUME
L
Audio volume
3
720 x 400
31.47
-
70.08
+
28.321
VGA
121
GPIO9
VGA_DETn
H
VGA cable connected when is L
120
GPIO8
DVI_DETn
H
DVI cable connected when is L
4
800 x 600
37.88
+
60.32
+
40
VESA
58
GPO3
UART_DO
H
UART interface data OUT
5
800 x 600
46.88
+
75
+
49.5
VESA
57
GPO2
UART_DI
H
UART interface data IN
6
832 x 624
49.72
57.283
MAC
74.55
VGA
127
PPWR
PANELVCC_EN
L
Panel power enable when is H
7
1024 x 768
48.36
-
60
-
65
VESA
49
PBIAS
BKLT_EN
L
Back light power enable when is H
64
GPIO16
DDC_SCL_VGA
H
DDC/CI interface for VGA
8
1024 x 768
60.02
-
75.03
-
78.75
VESA
65
GPIO17
DDC_SDA_VGA
H
DDC/CI interface for VGA
9
1152 x 720
44.86
-
60
+
66.75
66
GPIO18
DDC_SCL_DVI
H
DDC/CI interface for DVI
67
GPIO19
DDC_SDA_DVI
H
DDC/CI interface for DVI
10
1152 x 870
68.68
11
1152 x 900
61.8
12
1280 x 768
47.396
13
1280 x 960
60
14
1280 x 1024 63.98
+
60.02
15
1280 x 1024 79.98
+
75.02
16
1440 x 900
-
59.89
1.3.9 Miscellaneous:
1.3.9a Connector Pin Assignments:
V G A A n a lo g C o n n e c to r P in o u t
P IN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
M N E M O N IC
RV
GV
BV
NC
GND
RG
GG
BG
+ 3 .3 /+ 5 V
SG
NC
SDA
HS
VS
SCL
S IG N A L
R e d V id e o
G re e n V id e o
B lu e V id e o
N one
G ro u n d (D D C R e tu rn )
R ed G N D
G re e n G N D
B lu e G N D
+ 3 .3 /+ 5 V (fro m P C )
S y n c G ro u n d
N one
D D C D a ta
H o riz o n ta l S y n c
V e rtic a l S y n c
D D C C lo c k
PIN1
PIN11
PIN5
PIN9
55.94
75.06
65.96
+
60
-
CVT 0.83MA
DVT 16:10
100
MAC
92.978
SUN
68.25
CVT 0.98M9-R
108
VESA
+
108
VESA
+
135
VESA
+
106.5
CVT 1.30MA
60
NOTE: Modes 13 thru 15 are supported with scaled down video primarily to support navigation
to a supported timing mode.
8
HP L1908W
Go to cover page
T h e Pape r m u s t o n t o p o f U 'SSERM A N U AL
in orde r t o p ro t e ct M A N U. AL
2. Packing Exploded Drawing
3. Product Exploded Drawing
HP L1908W
Go to cover page
9
10
HP L1908W
4. Assembly and Disassembly Procedures
Go to cover page
4.1 Assembly Procedures:
S1
Connect the cable between power board(P802) and
interface board (P301)
Use a Phillips-head screwdriver screwed the No.1~4
S4
screws till that power board and bracket chassis base
firmly attached.
(No1 screw size=M4x8; No2~4 screw size=M3x6;
Torque=8~10KGFxCM).
P301
3
P802
1
S2
4
2
Connect FFC cable into interface board
Connect function key cable into interface
board(P307)
Use a Phillips-head screwdriver screwed the
Connect speaker cable into interface board(P310)
S5
No.1~4 screws till that interface board and bracket
chassis base firmly attached.
(No1~4 screw size=M3x6; Torque=8~10KGFxCM).
SPEAKER
CABLE
FFC
3
FUNCTION KEY
CABLE
4
S3
Take a bracket chassis base on a protective
cushion and stick an insulator on the specific
position, take a power board and turn it over. Then,
put it on the specific positions of bracket chassis
base.
1
Use PVC tape to stick the speaker cable
S6
2
HP L1908W
4. Assembly and Disassembly Procedures (continued)
11
Go to cover page
S7
Take the speaker cable out of the hole shown as
photo
S10
Connect FFC cable to LCD panel. There are two
locks over here when plugging in should be
noticed
LOCK
LOCK
Turn the monitor faced down and put it on the
S8
Bracket Chassis module till both parts firmly
attached
Take lamp cables out from the holes shown as the
photo.
Plug in parallel direction
Angel < 5 degrees
Connect the FFC cable to the connector of the LCD
S9
panel.
S11
Plug 8 lamp cables to the connectors of power
board.(Both of right and left sides)
12
HP L1908W
4. Assembly and Disassembly Procedures (continued)
Go to cover page
S12
Use a Phillips-head screwdriver screwed the No.1~4
screws on both side and assemble the LCD panel
S16
Connect function key cable into key function cable
(P600)
S17
Put the previous assembled module on the front bezel
Use a Phillips-head screwdriver screwed the
and bracket chassis module.
(No1~4 screw size=M3x5; Torque=2.5~3KGFxCM).
2
1
4
3
No.1~4 screws.
No1~4 screw size=M2x3.3Torque=0.8~1.2KGFxCM
S13
Use a Phillips-head screwdriver screwed the
No.1~2 screws.
(No1~2 screw size=M3x10; Torque=4~6KGFxCM).
1
S14
4
2
Use a Hex-head screwdriver screwed the
S18
bracket chassis
3
1
2
Use a Phillips-head screwdriver screwed the
No.1~4 screws.
(No1~4 screw size=M3x6; Torque=6~8KGFxCM).
(No.1~4 Hex Nut screws
Size=M3x8;Torque=5~7KGFxCM).
2
2
4
1
1
3
3
4
Use a Phillips-head screwdriver screwed the bracket
S15
chassis No.1 screw.
(No1 screw size=M3x4; Torque=4~6KGFxCM).
1
S19
Fix speaker line with hook shown as photo
4. Assembly and Disassembly Procedures (continued)
HP L1908W
13
Go to cover page
Put a rear cover on the assembled unit and press
S20
on force mechanisms locked and firmly attached.
Take two cushion foams; one is held the right side
of LCD monitor, and another is held the left side.
4
4
3
3
2
2
1
S21
S24
1
Assemble the stand upper side to the rear cover
through the way of screwing 3 screws till both
units firmly attached.
S25
Put accessories of DVI cable,audio cable and
power cable on specific positions as photo below.
(No1~2 screw size=M4x14; No3 screw
size=M4x10; Torque=11~13KGFxCM).
DVI CABLE
2
1
POWER
3
AUDIO
CABLE
S22
Stick a screen card on the front bezel with four
tapes.
S26
S23
3
1
4
2
Cover the finished good with an EPE bag. Stick
the EPE bag with one adhesive tape on the rear
side.
Move previous assembled parts into the carton
then packing the carton
14
HP L1908W
4. Assembly and Disassembly Procedures (continued)
Go to cover page
4.2 Disassembly procedures
S1
Open the carton with a proper tool.
Use a Phillips-head screwdriver unscrew 3 screws to
S5
release the stand base.
(No1~2 screw size=M4x14; No3 screw size=M4x10;
Torque=11~13KGFxCM).
2
1
3
S2
Take out all accessories including power cable, DVI
cables, audio cable and packing material from the
carton.
S6
Turn over the LCD monitor (screen faced up).
(Note: It depends on whether users returning the
accessories.)
DVI CABLE
POWER
AUDIO
CABLE
S7
Place cloth on the panel where you are working
on to protect the panel. Continuously, wedge
your finger between the front bezel and the panel,
then pry up on the front bezel to disengage the
Take off two cushion foams
locking mechanism.
Put returned unit on a protective cushion,then
Work your way along the front bezel to disengage
remove LDPE+EPE bag.
all the locking mechanism.
S3
S4
HP L1908W
4. Assembly and Disassembly Procedures (continued)
15
Go to cover page
S8
Turn over the LCD module(screen face down) then
remove the rear cover
Use a Phillips-head screwdriver unscrewed number
S11
1~2 screws to release the speaker from the front
bezel
(No1~4 screw size=M3x6; Torque=6~8KGFxCM).
1
2
3
S12
4
Use a Hex-head screwdriver unscrewed 4 screws to
release the D-SUB and DVI connectors
(No.1~4 Hex Nut screws
S9
Size=M3x8;Torque=5~7KGFxCM).
Use a Phillips-head screwdriver unscrewed
number 1~4 screws to release the power key board
from the front bezel
No1~4 screwsize=M2x3.3 Torque=0.8~1.2KGFxCM
2
4
4
3
2
1
1
3
Use a Phillips-head screwdriver unscrewed the
S13
No.1~2 screws to lease power plug
(No1~2 screw size=M3x10; Torque=4~6KGFxCM).
1
S10
2
Unconnect the function key cable then remove the
front bezel
Use a Phillips-head screwdriver unscrewed the
S14
No.1~4 screws to disassemble the LCD panel and
bracket chassis module.
(No1~4 screw size=M3x5; Torque=2.5~3KGFxCM).
1
3
2
4
16
HP L1908W
4. Assembly and Disassembly Procedures (continued)
Go to cover page
S15
Use a Phillips-head screwdriver unscrewed the
No.1screws to lease power plug
S18
Disconnect the FFC cable to the connector of panel.
Use finger to push the lock according to arrow
direction then take out the FFC cable
(No1 screw size=M3x4; Torque=4~6KGFxCM).
1
LOCK
Unplug 4 lamp cables (No. 1~4).
LOCK
S16
S19
S17
Examine the panel surface accoring to inspection
criteria. Put it aside.
Take out lamp cables right through the No.1 and
2 square holes and separate the bracket chassis
module and LCD panel apart.
S20
1
Use a Phillips-head screwdriver unscrewed the
No.1~4 screws to release the interface board.
(No1~4 screw size=M3x6; Torque=8~10KGFxCM).
2
3
4
1
2
4. Assembly and Disassembly Procedures (continued)
HP L1908W
Go to cover page
Use a Phillips-head screwdriver unscrewed the
S21
No.1~4 screws to disassemble the power board.
(No1 screw size=M4x8; No2~4 screw size=M3x6;
Torque=8~10KGFxCM).
S22
3
4
1
2
Disconnect FFC cable into interface board
Disconnect speaker cable into interface board
Disconnect function key cable into interface board
SPEAKER
CABLE
FFC
FUNCTION KEY
CABLE
S23
Disconnect the cable between power board(P802)
and interface board (P301)
P301
P802
17
18
5. Troubleshooting
HP L1908W
Go to cover page
5.1 No display on the screen (screen is black, and colour of LED is amber.):
Does the OSD display
on the screen upon pressing
the ‘MENU’?
NG
Proceed to ’5.5 Abnormal OSM display’ section.
NG
Input the sync signal of computer or change to
other workable cable for cross-test.
YES
Check if the sync
signal from computer is
output and if the video cable is
firmly connected.
OK
Proceed to ’5.4 Abnormal screen’
section.
HP L1908W
5. Troubleshooting (continued)
19
Go to cover page
5.2 Nothing displays on the screen (Screen is black, colour of LED is green.):
Is backlight lite?
NG
Proceed to ‘5.3 Checking the backlight unit’ section
NG
1) Change pattern of video signal output on the host.
2) Reconnect the video cable.
3) Change the video cable.
OK
Does the connected
computer output RGB
video signals?
OK
Check the OSD
menu whether if be shown on
the screen upon pressing the
"MENU" key.
NG
Check if the LCD
video signal cable is connected
properly between the MAIN
PWB and LCD module.
NG
The cable is disconnected.
OK
Proceed to ‘5.4 Abnormal Screen’
section.
OK
Check if the 3.3V
power is supplied on I302, pin2
and the 1.8V power is supplied
on I303, pin2.
Check if the Vdc
on I302, pin3 that is high level
DC at 5V.
NG
OK
OK
Failure Point
Check all LVDS signal
pins, output from I306.
NG
OK
Failure Point
1) The cable broke between P306
and LCD module.
2) LCD module failure.
NG
Failure Point
Printed wire broke or shorted
between I306 and P306.
I302 is defected.
Failure Point
1) Printed wire broke between
P301 pin1, pin2, pin3 and I302.
2) Check power board.
20
HP L1908W
5. Troubleshooting (continued)
Go to cover page
5.3 Checking the backlight unit:
Check the BKLT_EN
signal of the rectangle input
P301 pin 2 at TTL
high level
NG
Is a "H" level been
output in the TTL level from I306
pin49? <or> Is a ‘BKLT_EN’ signal of
the rectangle been
output?
NG
Failure Point
OK
Printed wire is broken between
I306 pin49 and P301.
Check if the input
signal from the I306 pin50 is a
DC voltage.
OK
Failure Point
Inverter of power board is defected.
Proceed to ‘5.11 Checking the
backlight unit’ section
Failure Point
NG
1) Printed wire broke between I306
pin50 and P301.
2) I306 failure.
HP L1908W
5. Troubleshooting (continued)
Go to cover page
5.4 Abnormal screen:
Failure Point
Check the R, G, B video
signal from computer input on DSub
R, G, B connector.
NG
OK
Check the R, G, B
input signals on I306 pin93, pin96,
pin99 respectively that their level is
0.7Vp-p maximum.
1) No R, G and B video signal is output from the
connected computer. Contact your regional computer
supplier for technical support.
2) Video signal cable is disconnected.
Failure Point
NG
Below results are based on the Red signal. (Green and
Blue signals are the same.)
1) Printed wire is broken between D-Sub(R) and I306
pin99.
2) R315 is short.
3) C317 is open.
4) R310 is open.
5) FB305 is open
6) FB306 is open
OK
Check all LVDS signal pins
which are output from I306.
OK
Process ‘5.8 Checking the resolution change
IC movement’ section.
Failure Point
NG
1) I306 failure.
2) Printed wire is broken between I306 and P306.
21
22
HP L1908W
5. Troubleshooting (continued)
Go to cover page
5.5 Abnormal OSD screen, OSD adjustment problem:
Failure Point
Check the input TTL level
whether if it was changed upon
pressing function keys.
OK
Proceed ‘5.4 Abnormal Screen’ section.
NG
1)
2)
3)
4)
5)
6)
7)
8)
Printed wire broke between P 308 pin 5 and I306 pin
Printed wire broke between P 308 pin 4 and I306 pin
Printed wire broke between P 308 pin 3 and I306 pin
Printed wire broke between P 308 pin 2 and I306 pin
C389, C390, C391, C392, short.
R381, R382, R384, R385, R378, R379 short/open.
R380, R383 open.
I306 failure.
113.
113.
113.
113.
5. Troubleshooting (continued)
HP L1908W
Go to cover page
5.6 Abnormal plug and play operation:
5.6.1 Abnormal DDC2 (D-SUB):
Confirm the output
of serial data on I304 pin 6
synchronize SCLK at
TTL level.
Failure Point
NG
I304 is defected.
OK
Failure Point
1) The host machine isn't communicating in DDC2
mode.
2) The video cable may be defected or may be
disconnected to cause the DDC communication
failure.
3) Printed wire is broken between I304 pin6 and P302
pin15.
4) R328, R329 is open.
5) I304 pin5 or pin6 is short.
6) Video cable is defected.
5.6.2 Abnormal DDC2 (DVI):
Confirm the output
of serial data on I305 pin6
synchronize SCLK
at TTL level.
OK
Failure Point
1) The host machine isn't communicating in DDC2
mode.
2) The video cable may be defected or may be
disconnected to cause DDC communication
failure.
3) Printed wire is broken between I305 pin6 and P303
pin6.
4) R346, R347 is open.
5) I305 pin5 or pin6 is short.
6) Video cable is defected.
Failure Point
NG
I305 is defected.
23
24
HP L1908W
5. Troubleshooting (continued)
Go to cover page
5.7 Checking the interface circuit of sync signal:
5.7.1 Checking the control circuit of horizontal sync pulse:
Failure Point
Check the
Horizontal sync
signal on I306 pin89
TTL level.
NG
1) Video cable may have failed.
2) Printed wire broke between P302 pin13 and I306
pin89.
3) FB311, R321 is open.
4) R324, C328 is short.
5) I306 is defected.
OK
Proceed to ‘5.8 Checking the resolution
change IC movement’ section.
5.7.2 Checking the control circuit of vertical sync pulse:
Failure Point
Check the vertical
sync signal on I306
pin90 TTL level.
OK
Proceed to ‘5.8 Checking the resolution
change IC movement’ section.
NG
1) Video cable may be defected.
2) Printed wire is broken between P302
pin14 and I306 pin90.
3) FB312, R322 is open.
4) R323, C327 is short
5) I306 is defected.
HP L1908W
5. Troubleshooting (continued)
Go to cover page
5.8 Checking the resolution changed IC movement:
Is there +3.3V supply
on I306 pin2, pin25, pin47, pin53, pin74,
pin82, pin91, pin92, pin101, pin110,
pin116?
NG
Proceed ‘5.9 Checking the DC/DC converter circuit’
section.
NG
Proceed ‘5.9 Checking the DC/DC converter circuit’
section.
OK
Is there +1.8V supply on I306
pin17, pin55, pin70, pin78, pin87,
pin104, pin106, pin118?
OK
Is 14.318MHz clock input
to I306 pin108 and pin109 at TTL
level during Power On?
Is 14.318MHz clock
output from X301 pin1 at
TTL level during Power
On?
NG
NG
Failure Point
OK
X301 failure
OK
Failure Point
Print wire broke between X 301
pin1 and I306 pin108.
Is +5.0V supplied to I306 pin111 at
low level (Reset signal)?
OK
NG
Check if the output of 5.0V
"L" pulse from I307 pin 2.
NG
Is 5.0V supplied to I307
pin3?
Failure Point
I306 is defected.
OK
OK
Failure Point
Failure Point
Print wire broke between I307
pin2 and I306 pin111.
I307 is defected.
25
26
HP L1908W
5. Troubleshooting (continued)
Go to cover page
5.9 Checking the DC/DC converter circuit:
Check if the 5V is output
from P301 pin5, pin6 to I302 pin3.
OK
Does +3.3V on I302 pin 2?
NG
Take off wire harness
connector of P301. Check if the
output of +5.15V between P802 +5.1V
(whichever pin 4,5,6,7) and ground (The
through hole of power board).
OK
Does +1.8V on I303 pin 2?
NG
NG
Is the low resistance
(lower than 5? ) between I302
pin 2 and ground
(P301 pin 1 or pin 9) ?
Is the low resistance
(lower than 5? )
between I303 pin 2 and ground
(P301 pin 1 or pin 9) ?
Yes
Yes
NG
Failure Point
Failure Point
OK
1) I302 defected.
2) The +3.3V circuit been ground
connection.
* Might be I306 defected or by pass
capacitor of power pin of I306 3.3V
defect.
Failure Point
Power board defect, proceed to
“5.10 N0 power ON check.”
Is the low resistance
(lower than 5 ohm)
between I302 pin3 and ground
(P301 pin 1 or pin 9)?
1) I303 defected.
2) The +1.8V circuit been ground
connection.
* Might be I306 defected or by pass
capacitor of power pin of I306 1.8V
defect.
Yes
Failure Point
1) C313 short.
2) I302 is defected.
No
Failure Point
Is the low resistance
(lower than 5 ohm) between
I302 pin2 and ground
(P301 pin1 or pin9)?
Yes
Failure Point
1) I302 defected.
2) The +3.3V circuit been ground
connection.
* Might be I306 defected or by pass
capacitor of power pin of I306 3.3V
defect.
No
1) I302 is defected.
2)Printed wire is broken between I302
pin3 and output of FB301,FB302.
6. Troubleshooting (continued)
HP L1908W
Go to cover page
5.10 No power on:
Failure Point
Check if the output voltage
+5V is correctly
OK
The functions of Power Board is working
successfully.
OK
Check if AC power
cord P801 and signal cables
of P302, P802, P101, P102,
P103, P104 is connected
properly.
Failure Point
NG
Reconnect the P801, P302, P802, P101, P102,
P103, P104 cables and make sure they are firmly
connected.
OK
Failure Point
Check if C 801 has
charged DC140V-330V
NG
Check F801, D802, P801 and repair them if be
damaged
OK
Check if C 807 is over
16V or not.
Failure Point
NG
Check D803, R807, I801, C807, ZD801 and repair
them if be damaged.
OK
Check if I801 pin8
has same pulse
or not.
Failure Point
NG
Check peripheral components of I801 and repair
them if be damaged.
OK
Check if T801 pin1 has
same pulse or not.
Failure Point
NG
Check Q 801, R813 and repair them if be damaged.
OK
Failure Point
Check if peak voltage
of R813 triangle pulse is up to
1.5V or not.
NG
Check if peak voltage of R 813 triangle pulse is up
to 0.85V or not.
OK
Check T801,
D812, C825, C824 have
same short circuit, or the
output +5V is
over load
OK
Check feedback circuit around I803 and
the other component and repair them if be
damaged.
Failure Point
OK
Repair T801, D812, C825, C824 if be damaged.
27
28
HP L1908W
5. Troubleshooting (continued)
Go to cover page
5.11 Checking inverter board circuit:
Check 22V output
pin is around 20V; on/off
pin is over 3V; brightness pin is in the
range of 0V and
3.2V.
Failure Point
OK
The functions of Inverter Board is working successfully.
OK
Failure Point
Check if I101 pin6 is 5V.
NG
Check R105, C112 and repair them if be damaged.
OK
Failure Point
Check if P101, P102, P103,
P104 is connected properly.
NG
Check CCFL and repair them if be damaged.
OK
Check if I101 pin4, pin5 has triangle
pulse.
Failure Point
NG
Check I101 and repair them if be damaged.
OK
Failure Point
Check if I101 pin1 has
soft start edge up to 2.4V.
NG
Repair I101.
OK
Failure Point
Check if T801 pin1 has
same pulse or not.
NG
Check Q801, R813 and repair them if be damaged.
OK
Check if I101 pin8
has pulse up to 1.2V from output
detection.
Failure Point
NG
Check D102, D103, D107, D108, D114, D115, D112,
D113 and repair them if be damaged.
OK
Check if half bridge
circuit (Q104, Q105, Q106, Q107,
Q108) is
working fine.
OK
Check if transformers of T101, T102 are
working fine.
Failure Point
OK
Repair Q104, Q105, Q106, Q107, Q108 if be damaged.
HP L1908W
5. Troubleshooting (continued)
29
Go to cover page
5.12. Abnormal Audio Output:
Failure Point
Check if the audio signal supplied
to I310 pin 4,5,7 and 8.
1) Check if audio cable is connected to P309.
2) Check if FB318, R386 or C394 open/short.
3) Check if FB319, R387 or C398 open/short.
4) Check if C395, C396 open/short.
2) Check if printed wire is broken between P309
pin2 (pin3) and C398 (C394).
3) Check if I310 defect.
NG
OK
Failure Point
Check if the +5.35V is
Supplied to I310 pin 3, pin 6
and pin 9.
NG
1) Check if FB321 defect.
2) Check if printed wire is broken between P301
pin7 (pin8) and FB321.
3) Check if I310 defect.
* The circuit been ground connection on
pin3, pin6, and pin9.
OK
Failure Point
Check if the logic H level on the
I310 pin 14.
NG
Failure Point
Check if the logic High level
on I306 pin 51.
OK
1) Check if R390, R391, R392 open.
2) Check if C400 short.
3) Check if Q309 defected.
4) Check if printed wire is broken between Q309
and I310 pin14.
5) Check if I310 defect.
* The circuit been ground connection on pin3
or pin 6 or pin 9.
NG
OK
I306 defected.
Check if the lower than 0.5V
on the I310 pin 18 while volume
at default setting.
NG
Yes
NG
1) Check if printed wire is broken between I310
pin2, pin20, pin10, pin12, and P310 pin4, pin3,
pin2, pin1.
2) Check if I310 defect.
3) Check if wire harness is broken.
4) Check if the speaker defected.
Check if the PWM pulse on
I306 pin 56.
Failure Point
Yes
1) Check if R393, R394, R395, R396, C405
open/short.
2) Check if Q310 defected.
3) Check if printed wire is broken between Q310
and I306 pin 56.
5) Check if I310 defect.
6. Schematics and Layouts:
1
AC-IN
To Speaker
2 x 2W
Speaker
2
2
3
4
4
5
CCFL Wire
+5V DC Power
I302
LDO
I303
I301
6
(Switch LCD
Panel
Power)
+1.8V Main
Power
(DVI EDID)
6
7
7
TMDS
+5V Panel
Power
Digital
Video
Input
P303 DVI-D
I305 24LC02
DDC_SCL_DVI
DDC_SDA_DVI
LDO
5
+3.3V Main
Power
Brightness,Invter On/Off
+3.3V Main
Power
+5V DC power
P301
(Connect to Power Board)
Power Board
Audio
Source
3
(AUDIO Source)
P309 Audio Input
I310 Audio AMP
(TDA6021A4)
P310 Audio Output
+5V DC power
for audio
6.1 HP_L1908W_BLOCK DIAGRAM
A
B
C
D
E
F
G
1
8
LCD Module
P306 LVDS output
LVDS
I306
Scaler
Gm5726H
8
R,G,B,Hs,Vs
9
10
11
11
12
12
P307 & P308
Function Key Input
& LED output
Interface Board
24LC16B
I308
EEPROM
I309
Serial Flash ROM
I307 Reset IC
I304 24LC02
10
DDC_SCL_VGA,
DDC_SDA_VGA
(VGA EDID)
P302 DSUB
Analog
Video
Input
9
PCB No.
13
Function
Key
Board
13
A
B
C
D
E
F
G
HP L1908W
Go to cover page
30
8
3
C819
R802
4
1
GND-1
1
+
2
C
1
A
C808
4
D801
GBLA08
R814
5
0.01u/1KV
C805
+
C815
0.01uF
1KV
GND-1
6
C806
D804
2
2
R805
100K/2W
7
D803
PR1007G
L803
BEAD/6mm
GND-1
C810
100P
1KV X7R
R811
0.27/2W
GND-1
R851
Q803
7N65C
1N4937
1
0.01uF/630V
R803 1W
0.51 MOF
R804
15K
1
D812
R824
4.7K 1%
R853
1.5K
R163
220K
7
2
1
4
5
3
T802
ER28
10
L804
Q102
3904
8
GND
JUMPER WIRE
9
7
6
C802
3300P/250V
C832
3
1
8
3
1
D113
2
2
+
9
+
GND
GND
+
GND-2
10
C817
NC
+
GND
.
2
.8
4
10
C122
10UF
1206
3
1
EEL22
.
6
.
7 T101 5
C191
220P
0805
C822
1000U/10V
GND
C123
10UF
1206
D101
SB140
R130
470 1%
C134
10UF
1206
+
C818
470U/35V
C831
0.1uF
0805
+22V
C125
470uF/35V
STPF1020CT
C816
1000P
500V X7R
2
C821
1000P
100V X7R
SRF1045C
D810
D809
3
1
+
C124
470uF/35V
GND
Q104
AOD413
1
C192
220P
0805
C128
0.022uF
9
GND
R131
33
D102
SB140
GND
1N4148
1
D112 1N4148
1
2
D141
22B
Q105
AOD454
1
3906
12K
R128
1
GND
3
Q103
1
1000P/250V
GND-1
2
2
R852
100
Q101
2N7002
GND
33
R133
1
R134
2K/0805
R132
2K/0805
33K 1%
1N4148
1
R827
33K 1%
C811
0.22uF
R807 3.9
VR801
10K
GND
R107
5.6K
C104
330P
GND-2
C161
68P
R118
56K
120K/0805
R829
R815
4.7K/MOF
D806
1N4148
1
2
R813
100/MOF
R819
1K/MOF
R823
270
C827
0.01uF
C106
0.047uF
3
R
I803
AP431
R825
1K
22/MOF
GND
R106
R104
510K
GND
+
R826
1K
R830
68K/0805
+
C809
0.01u/1KV
SCK083
C820
2200P/250V-Y
GND-1
GND
C825
2200P/250V-Y
C807
82uF/35V
-
T801
ET-20
7
GND-1
I802
2
C103
GND-2
+
2
C803
*
*
DRAIN
I801
HV SPACE
6
4
3
GND
C828
2.2uF/50V
LTV817
16
15
14
13
12
11
10
9
C131
1000P
6
GND
C814
0.1uF
0805
L802
10U
C824
1000U/10V
11
D811
22B
1
+
GND
C112
10P/3KV
R116
3M 1/4W
R115
3.3K 1%
GND
R828
1K
2
12
+22V
910/2W
R818
GND
GND
GND
GND
C118
5P/3KV
C119
470P
X7R
GND
BRI
ON-OFF
R138
100/0805
D116
2
1N4148
1
13
P802
1
2
1
2
1
2
1
2
P101
2P
P102
2P
R137
1K/0805
2
1
2
1
P104
2P
P103
2P
R141
1K/0805
GND
D117
1N4148
1
2
3
4
5
6
7
8
9
10
GND
1
2
1
2
R139
1K/0805
R142
1K/0805
GND
6832177300P01
13
GND
D121
1N4148
D120
1N4148
1
2
R140
100/0805
R111
470 1%
GND
C115
470P
X7R
C114
5P/3KV
GND
+5V
GND
Q806
3904
12
R122
15K 1%
R121
100K 1%
C109
0.022uF
15K 1%
R119
100K 1%
R117
C823
1000U/10V
GND
R817
1K
1N4148
1
GND
R126
3.3K 1%
R125
3M 1/4W
C116
10P/3KV
D108
2
D107 1N4148
1
2
GND
R840
68K
0805
D106
1N4148
1
2
D114
1N4148
1
2
R120
12K
D109
1N4148
1
2
D118
1N4148
1
2
11
3
1
C801
VCC
GDRV
5
+
PGND
GND-1
I101
DRV2
GNDA
CT
NC
ENA
LCT
SSTCMP
OZ9938
R151
39K
100U/450V
F801
R822
300K
0805
C804
GND
GND
1
IS
C826
DRV1
VDDA
TIMER
DIM
ISEN
VSEN
OVPT
NC
0.1U/275V
3.15AL250V
R821
300K
0805
R820
300K
0805
2
PRCT
VCC
3
CTRL
VCC
8
7
6
5
4
3
2
1
4.75K 1%
R806
TEA1530
4
R816
0
C812
33nF
GND-1
3
1
3
2
GND
1
C829
+
R808
13K
C101
0.1uF
R102
30.1K
1
L
G
N
P801
D807
18B
R809
100K
+
GND-2
10K
R113
+ C110
R103
18K
4
C130
1000P
GND-2
R151:39K~75K
(7.5mA~6.5mA)
5
1
3
2
6.2 HP_L1908W_SCHEMATICS_POWER BOARD
A
B
C813
0.22uF
GND-1
BRI
22
C102
R105
ON-OFF
+5V
R136
10K
C111
1000P
GND-2
GND-2
R135
1M
1
4
2
3
1
PCB No.
1
1
2
0.1U/275V
1uF/50V
2
GND-2
1
1uF/50V
2
3
3
2
1
2
C
D
E
GND-2
R101
10K
C105
1000P
GND-2
2
2
3
2
2
3
2
1
2
F
G
1
150K 1%
GND-2
1
2
1
22uF/50V
2
2.2uF/50V
2
2.2uF/50V
1
2
A
B
C
D
E
F
G
HP L1908W
Go to cover page
31
VDD
NC
VCC5V
VCC5V
VCC5V
6.AUDIO
VDD
DDC_WPn
DVI_DETn
HDCP_HPDn
RX2+
RX2RX1+
RX1RX0+
RX0RXC+
RXC-
AUDIO_EN
VOLUME
6.AUDIO
2
2
3.DVI & DDC INTERFACE
DDC_SCL_DVI
DDC_SDA_DVI
VCC5V
3.DVI & DDC INTERFACE
2.VGA & DDC INTERFACE
DDC_WPn
VGA_DETn
DDC_SCL_VGA
DDC_SDA_VGA
HS_IN
VS_IN
RIN
GNDR
GIN
GNDG
BIN
GNDB
2.VGA & DDC INTERFACE
1
4
RIN
GNDR
GIN
GNDG
BIN
GNDB
DDC_SCL_VGA
DDC_SDA_VGA
RIN
GNDR
GIN
GNDG
BIN
GNDB
DDC_SCL_VGA
DDC_SDA_VGA
DDC_WPn
VGA_DETn
DVI_DETn
HDCP_HPDn
RX2+
RX2RX1+
RX1RX0+
RX0RXC+
RXC-
AUDIO_EN
VOLUME
AUDIO_EN
DDC_SCL_DVI
DDC_SDA_DVI
VOLUME
DDC_SCL_DVI
DDC_SDA_DVI
RX2+
RX2RX1+
RX1RX0+
RX0RXC+
RXC-
DDC_WPn
DVI_DETn
HDCP_HPDn
DDC_WPn
VGA_DETn
HS_IN
VS_IN
4
HS_IN
VS_IN
3
3
6.3 HP_L1908W_SCHEMATICS_INTERFACE BOARD TOP
A
B
C
D
E
F
G
NC
1
5
4.SCALER GM5726H
RIN
GNDR
GIN
GNDG
BIN
GNDB
HS_IN
VS_IN
DDC_SCL_VGA
DDC_SDA_VGA
DDC_WPn
VGA_DETn
DVI_DETn
HDCP_HPDn
RX2+
RX2RX1+
RX1RX0+
RX0RXC+
RXC-
DDC_SCL_DVI
DDC_SDA_DVI
AUDIO_EN
VOLUME
5
6
6
7
7
8
CH3P_LV_E
CH3N_LV_E
CH2P_LV_E
CH2N_LV_E
CH1P_LV_E
CH1N_LV_E
CH0P_LV_E
CH0N_LV_E
CLKP_LV_E
CLKN_LV_E
CH3P_LV_O
CH3N_LV_O
CH2P_LV_O
CH2N_LV_O
CH1P_LV_O
CH1N_LV_O
CH0P_LV_O
CH0N_LV_O
CLKP_LV_O
CLKN_LV_O
LED_B
LED_A
LBADC_IN1
LBADC_IN2
PWR_KEYn
BKLT_ADJ
BKLT_EN
PANELVCC_EN
VCC5V
VCC3V3
VCC1V8
3V3_DVDD1
4.SCALER GM5726H
8
10
CH3P_LV_E
CH3N_LV_E
CH2P_LV_E
CH2N_LV_E
CH1P_LV_E
CH1N_LV_E
CH0P_LV_E
CH0N_LV_E
CLKP_LV_E
CLKN_LV_E
CH3P_LV_O
CH3N_LV_O
CH2P_LV_O
CH2N_LV_O
CH1P_LV_O
CH1N_LV_O
CH0P_LV_O
CH0N_LV_O
CLKP_LV_O
CLKN_LV_O
1.POWER
BKLT_ADJ
BKLT_EN
PANELVCC_EN
12
VCC5V
VCC3V3
VCC1V8
VLCD
VDD
1.POWER
12
VCC5V
13
3V3_DVDD1
VLCD
VLCD
VDD
6832176900P02
13
VCC1V8
VCC3V3
VCC5V
5.KEY & PANEL INTERFACE
3V3_DVDD1
LED_B
LED_A
VLCD
LBADC_IN1
LBADC_IN2
PWR_KEYn
VCC5V
5.KEY & PANEL INTERFACE
11
CH3P_LV_E
CH3N_LV_E
CH2P_LV_E
CH2N_LV_E
CH1P_LV_E
CH1N_LV_E
CH0P_LV_E
CH0N_LV_E
CLKP_LV_E
CLKN_LV_E
9
CH3P_LV_E
CH3N_LV_E
CH2P_LV_E
CH2N_LV_E
CH1P_LV_E
CH1N_LV_E
CH0P_LV_E
CH0N_LV_E
CLKP_LV_E
CLKN_LV_E
11
BKLT_ADJ
BKLT_EN
PANELVCC_EN
LED_B
LED_A
LBADC_IN1
LBADC_IN2
PWR_KEYn
CH3P_LV_O
CH3N_LV_O
CH2P_LV_O
CH2N_LV_O
CH1P_LV_O
CH1N_LV_O
CH0P_LV_O
CH0N_LV_O
CLKP_LV_O
CLKN_LV_O
10
CH3P_LV_O
CH3N_LV_O
CH2P_LV_O
CH2N_LV_O
CH1P_LV_O
CH1N_LV_O
CH0P_LV_O
CH0N_LV_O
CLKP_LV_O
CLKN_LV_O
LED_B
LED_A
LBADC_IN1
LBADC_IN2
PWR_KEYn
BKLT_ADJ
BKLT_EN
PANELVCC_EN
VCC5V
VCC3V3
3V3_DVDD1
VCC1V8
9
PCB No.
A
B
C
D
E
F
G
HP L1908W
Go to cover page
32
2
VDD
3
C302
10uF/16V(NC)
C303
4
0.
1uF
5
C307
6
100uF/16V
VDD
VCC5V
C306
R307
10K
VOUT
4
2
6
B
C
Q302
MMBT3904
VIN
TAB
I302
ADJ
AIC1084-33CM
5
T14
0.
1uF
T17
1
3
TO-263
2
C305
PBY160808T-600Y-S
R309
2K4
VCC5V
C313
10uF/16V
4
18K(NC)
R303
7
C304
T4
0.
1uF(NC)
R306
T8
C308
10K(NC)
T15
0.
1uF
T11
C309
0.
1uF
8
R302
10K
C310
10uF/16V
VCC3V3
9
T5
D
S
3
1
VCC5V
10
R301
1K
2
VIN
TAB
VOUT
10
AIC1117-18PE
ADJ
I303
TO-252
3
Q301
MMBT3904
G
I301
AO3401
9
2
C315
VCC3V3
C314
8
10uF/16V
7
100uF/16V
VCC3V3
R308
47K
T18
E
0.
1uF
VCC5V
C301
T10
T16
FB303
PBY160808T-600Y-S
PBY160808T-600Y-S
0.
1uF
T1
6.4 HP_L1908W_SCHEMATICS_INTERFACE BD_POWER
1
T3
Note:VDD for the audio power
T2
FB301
FB302
BACKLIGHT_ADJ
BACKLIGHT_EN
VCC5V
PANELVCC_EN
3
3
1
A
P301
9
8
7
6
5
4
3
2
1
JWT-A2001WR2-9P
PANELVCC_EN
2
1
B
C
D
E
F
G
1
3
1
11
R304
4K7
R305
100
FB304
T7
T9
12
T13
BKLT_ADJ
BKLT_EN
VLCD
C312
PBY160808T-600Y-S
0.
1uF
VCC1V8
VCC1V8
C311
T19
C316
100uF/16V
12
VLCD
BKLT_EN
BKLT_ADJ
13
13
6832176900P02
0.
1uF
T12
T6
2
4
11
PCB No.
A
B
C
D
E
F
G
HP L1908W
Go to cover page
33
A
B
C
D
E
F
3
T20
C322
0.1uF
T21
5
3
D303
MMBD7000
VCC5V
1K
FB311
VGA_5V
VCC5V
T50
C330
0.1uF
D309
MMSZ5232B
5
2
T22
6
7
T25
FB306
8
SBK160808T-600Y-S
RED_IN
9
GREEN_IN
T24
SBK160808T-600Y-S
T23
FB308
0
0
FB305
FB307
BLUE_IN
R315
SBK160808T-600Y-S
R314
75/1%
FB310
R313
75/1%
T26
T33
T38
R310
10
75/1%
T27
11
C317
C318
10nF
12
T28
RIN
GIN
GNDR
GNDG
10nF
10nF
10nF
100
C319
R311
C320
T32
75/1%
T31
100
T30
R312
T29
R316
BIN
T37
10nF
T36
C324
GNDB
T35
75/1%
10nF
T34
R317
C325
T40
100
T39
VGA_DETn
R318
T45
T48
T54
100pF
C328
HS IN
T53
100
C327
10K
R325
100pF
T51
2
2K4
11
T57
PCB No.
12
DDC_SCL_VGA
DDC_SDA_VGA
DDC_WPn
R321
DDC5V_A
I304
VCC
WP
SCL
SDA
Q303
MMBT3904
R330
VS IN
8
7
6
5
24C02
10
T56
100
T49
8
9
R322
1
2
3
4
0
75/1%
VCC5V
R319
10K
T47
A0
A1
A2
GND
FB309
T42
R324
C326
2K4
0.1uF
D306
D304
MMSZ5232B
MMSZ5232B
R323
T44
2K4
C329
D305
0.1uF
MMSZ5232B
D308
DDC_SCL_VGA
DDC_SDA_VGA
DDC_SCL_VGA
DDC_SDA_VGA
MMSZ5232B
C332
R327
47pF
12K
C331
R326
47pF
7
12K
D310
6
MMSZ5232B
D307
BAT54C
C323
0.1uF
1
4
4
47
47
SBK160808T-451Y-S
SBK160808T-451Y-S
FB312
R320
VCC5V
D302
MMBD7000
3
2
2
C321
0.1uF
T41
T43
T46
VCC5V
R328
R329
1
1
D301
MMBD7000
VCC5V
T55
T52
VGA_CONn
3
2
VGA_RED
VGA_5V
VGA_GREEN
VGA_CONn
VGA_BLUE
VGA_HSYNC
VGA_SDA
VGA_VSYNC
VGA_SCL
VGA_SCL
VGA_SDA
1
P302
1
9
2
10
3
11
4
12
5
13
6
14
7
15
8
CONNECTOR DB15
2
3
6.5 HP_L1908W_SCHEMATICS_INTERFACE BD_VGA & DDC INTERFACE
G
1
3
1
17
16
13
RIN
GNDR
GIN
GNDG
BIN
GNDB
VGA_DETn
HS_IN
VS_IN
DDC_WPn
DDC_SCL_VGA
DDC_SDA_VGA
13
6832176900P02
A
B
C
D
E
F
G
HP L1908W
Go to cover page
34
2
DVI_RX2DVI_RX2+
DVI_SCL
DVI_SDA
DVI_RX1DVI_RX1+
DVI_5V
DVI_CONn
DVI_HP
DVI_RX0DVI_RX0+
DVI_RXC+
DVI_RXC-
3
T58
T65
T66
T67
T72
T76
T68
VCC5V
R346
R347
4
VCC5V
C333
0.1uF(NC)
T69
5
VCC5V
C334
0.1uF(NC)
C344
D312
MMBD7000(NC)
R337
2
T70
T73
Q305
MMBT3904(NC)
DDC5V_D
D323
D320
BAT54C(NC)
5
MMSZ5232B(NC)MMSZ5232B(NC)
D322
DVI_5V
VCC5V
T63
1
0.1uF(NC)1K(NC) 0.1uF(NC)
C343
DVI_5V
D311
MMBD7000(NC)
1
47(NC)
47(NC)
2
3
6.6 HP_L1908W_SCHEMATICS_INTERFACE BD_SCALER GM5726H
1
P303
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
C1
C2
C3
C4
C5
T82
T83
4
6
VCC5V
C335
0.1uF(NC)
D313
MMBD7000(NC)
VCC5V
C339
0.1uF(NC)
D316
MMBD7000(NC)
T176
7
C336
0.1uF(NC)
R336
8
9
10
11
T61
12
T62
RX2RX2+
T60
10/1%(NC)
10/1%(NC)
T59
R332
R333
10K(NC)
DVI_RX2DVI_RX2+
DDC_WPn
HDCP_HPDn
RXC+
RXC-
RX0RX0+
DVI_DETn
RX1RX1+
T75
T77
2K4(NC)
DDC_SCL_DVI
DDC_SDA_DVI
PCB No.
12
T81
10/1%(NC)
10/1%(NC)
R345
R334
R335
C338
T64
0.1uF(NC)
T74
T71
D315
T80
10/1%(NC)
10/1%(NC)
10/1%(NC)
10/1%(NC)
MMSZ5232B(NC)
R338
R339
R340
R341
R344
10K(NC)
2
T85
T84
Q304
MMBT3904(NC)
10
11
DVI_RX1DVI_RX1+
VCC5V
C342
0.1uF(NC)
D319
MMBD7000(NC)
DVI_RX0DVI_RX0+
DVI_RXC+
DVI_RXC-
DDC5V_D
1
2
3
4
T79
9
A0
A1
A2
GND
24C02(NC)
VCC
WP
SCL
SDA
I305
D318
MMBD7000(NC)
T101
T78
8
7
6
5
R331
VCC5V
VCC5V
C341
0.1uF(NC)
1K(NC)
100uF/16V(NC)
C337
VCC5V
D314
MMBD7000(NC)
DVI_CONn
VCC5V
C340
0.1uF(NC)
D317
MMBD7000(NC)
D321
2K4(NC)
R343
MMSZ5232B(NC)0.1uF(NC)
R361
R342
12K(NC)
C345
12K(NC)
C347
DDC_SCL_DVI
DDC_SDA_DVI
C346
DDC_SCL_DVI
DDC_SDA_DVI
8
47pF(NC)
7
47pF(NC)
6
1
RX2RX2+
GND
RX4RX4+
SCL
SDA
VS
RX1RX1+
GND
RX3RX3+
5V
GND
HP
RX0RX0+
GND
RX5RX5+
GND
RXC+
RXCRED
GRN
BLU
HS
GND
DVI_SCL
DVI_SDA
3
2
3
1
A
27
29
31
32
30
28
DVI-D(NC)
2
2
3
1
1
2
3
2
3
1
1
2
3
2
3
B
C
D
E
F
G
1
3
1
3
1
2
3
13
RX2RX2+
RX1RX1+
DVI_DETn
RX0RX0+
RXC+
RXC-
HDCP_HPDn
DDC_WPn
DDC_SCL_DVI
DDC_SDA_DVI
13
6832176900P02
A
B
C
D
E
F
G
HP L1908W
Go to cover page
35
A
B
C
2
T87
VCC3V3
3
3V3_AVDD
C358
4
C359
T88
6.7 HP_L1908W_SCHEMATICS_INTERFACE BD_SCALER
1
3V3_RPLL
FB315
VCC3V3
FB314
C357
0.1uF
C360
0.1uF
C361
0.1uF
5
VCC3V3
FB313
C352
C353
C354
7
C351
0.1uF
6
C350
0.1uF
T86
C349
0.1uF
FB323
8
X301
14.318MHZ
T91
3V3_DVDD1
PBY160808T-301Y-S
C348
0.1uF
3V3_DVDD
PBY160808T-301Y-S
0.1uF
10pF
0.1uF
C362
3V3_RPLL
10uF/16V
1
C372
9
XTAL
TCLK
I306
3V3_DVDD1
108
109
3V3_AVDD
3V3_RPLL
RED+
REDGREEN+
GREENBLUE+
BLUE-
HSYNC
VSYNC
RESETn
RVDD_33
3
2
DDC_SCL_VGA/GPIO_16
DDC_SDA_VGA/GPIO_17
3
DDC_SCL_DVI/GPIO_18
DDC_SDA_DVI/GPIO_19
1
2
RX2+
RX2RX1+
RX1RX0+
RX0RXC+
RXC-
3
2
REXT
3
2
GPO_5/PWM1
GPO_4/PWM0
GPO_3
GPO_2
GPO_1/PWM3
GPO_0/PWM2
10
3V3_DVDD
1
PWR_KEYn
LBADC_IN2
LBADC_IN1
11
1V8_CVDD
11
1V8_AVDD
12
120
121
122
123
124
125
126
128
3
4
5
6
7
8
9
10
11
12
13
14
15
16
19
20
85
86
21
22
23
24
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
127
49
105
DVI_DETn
VGA_DETn
SCL
SDA
DDC_WPn
LED_A
LED_B
CH3P_LV_E
CH3N_LV_E
CLKP_LV_E
CLKN_LV_E
CH2P_LV_E
CH2N_LV_E
CH1P_LV_E
CH1N_LV_E
CH0P_LV_E
CH0N_LV_E
HDCP_HPDn
CH3P_LV_O
CH3N_LV_O
CLKP_LV_O
CLKN_LV_O
CH2P_LV_O
CH2N_LV_O
CH1P_LV_O
CH1N_LV_O
CH0P_LV_O
CH0N_LV_O
PANELVCC_EN
BKLT_EN
R369
C383
13
DVI_DETn
VGA_DETn
DDC_WPn
LED_A
LED_B
CH3P_LV_E
CH3N_LV_E
CLKP_LV_E
CLKN_LV_E
CH2P_LV_E
CH2N_LV_E
CH1P_LV_E
CH1N_LV_E
CH0P_LV_E
CH0N_LV_E
HDCP_HPDn
CH3P_LV_O
CH3N_LV_O
CLKP_LV_O
CLKN_LV_O
CH2P_LV_O
CH2N_LV_O
CH1P_LV_O
CH1N_LV_O
CH0P_LV_O
CH0N_LV_O
C382
0.1uF
PANELVCC_EN
BKLT_EN
R368
820K
LBADC_IN1
LBADC_IN2
PWR_KEYn
C381
0.1uF
115
114
113
112
R367
820K
6832176900P02
13
0.1uF
PCB No.
12
820K
LBADC_IN1/GPIO_20
LBADC_IN2/GPIO_21
LBADC_IN3/GPIO_22
LBADC_VSS
VBUFC_RPLL
PPWR
PBIAS
GPIO_24
GPIO_25
GPIO_26
GPIO_27
GPIO_28
IR_IN/GPIO_29
PD16/GPO36
PD17/GPO37
PD18/GPO38
PD19/GPO39
CH3P_LV_O/PD20
CH3N_LV_O/PD21
CLKP_LV_O/PD22
CLKN_LV_O/PD23
CH2P_LV_O/DEN
CH2N_LV_O/DHS
CH1P_LV_O/DVS
CH1N_LV_O/DCLK
CH0P_LV_O
CH0N_LV_O
PD10/V_FIELD
PD11
GPIO_30
GPIO_31
PD12/GPO32
PD13/GPO33
PD14/GPO34
PD14/GPO35
VCLK_IN
VHS_IN
VVS_IN
VDE_IN
CH3P_LV_E/PD0
CH3N_LV_E/PD1
CLKP_LV_E/PD2
CLKN_LV_E/PD3
CH2P_LV_E/PD4
CH2N_LV_E/PD5
CH1P_LV_E/PD6
CH1N_LV_E/PD7
CH0N_LV_E/PD8
CH0N_LV_E/PD9
GPIO_8/VDATA[0]
GPIO_9/VDATA[1]
GPIO_10/VDATA[2]
GPIO_11/DATA[3]
GPIO_12/VDATA[4]
GPIO_13/VDATA[5]
GPIO_14/VDATA[6]
GPIO_15/VDATA[7]
106
PBY160808T-301Y-S
0.1uF
C371
T90
C370
XTAL
TCLK
72
73
75
76
80
81
83
84
69
RX2+
RX2RX1+
RX1RX0+
RX0RXC+
RXCREXT
119
50
58
57
56
51
PWR_KEYn
LBADC_IN2
LBADC_IN1
VDD_RPLL_18
C356
10uF/16V
1V8_AVDD
C369
0.1uF
FB317
PBY160808T-301Y-S
VCC1V8
C368
10pF
99
100
96
97
93
94
250/1%
R358
SPI_CSn
SPI_CLK
SPI_DI
SPI_DO
VDD_OUT_33 2
VDD_OUT_33 25
VDD_OUT_33 47
10
104
C355
10uF/16V
VCC1V8
C367
T89
C366
1V8_CVDD
C365
C373
RIN
GNDR
GIN
GNDG
BIN
GNDB
89
90
T92
RIN
GNDR
GIN
GNDG
BIN
GNDB
HS_IN
VS_IN
63
111
IC_RESETn
T96
HS_IN
VS_IN
C377
0.1uF
C376
3V3_DVDD
R350
IC_RESETn
C375
100pF
3V3_AVDD
2K4
59
60
61
62
gm5726H
PQFP-128
9
53
91
PBY160808T-301Y-S
FB316
C364
HS_IN
VS_IN
RIN
GNDR
GIN
GNDG
BIN
GNDB
C363
VCC3V3
R348
2K4
T93
0.1uF
VCC5V
C374
0.1uF
T177
T94
0.1uF
3
1
2
0.1uF
I307
T178
STL8110GNL463 (FNLH)
GND
RST
0.1uF
VCC5V
VCC
10uF/16V
R398
0.1uF
R397
I312
CEN7002A
RX2+
RX2RX1+
RX1RX0+
RX0RXC+
RXC-
3V3_DVDD
R357
T97
2K4
R352
R356
2K4(NC)
2K4
R351
R355
GPO_5
BKLT_ADJ
UART_DO
UART_DI
VOLUME
AUDIO_EN
2K4
2K4
VCC3V3
64
65
RX2+
RX2RX1+
RX1RX0+
RX0RXC+
RXC-
VOLUME
AUDIO_EN
R354
SPI_CSn
SPI_CLK
SPI_DI
SPI_DO
2K4
H:Use ATMEL SPI ROM,L:Use Standard SPI ROM.
T95
R353
R362
H:J-TAG port disable,L:J-TAG port enable.
10/1%
PIN 50
H:Use OSC,L:Use Xtal.
8
2K4(NC)
C380
10K
T181
0.1uF
T102
R349
PIN 51
H:Internal ROM off,L:Internal ROM on.
SPI_HOLDn
SPI_CLK_IN
SPI_DO
PIN 56
Set to low.
VCC
HOLD#
SCK
SI
T108
PIN 57
T109
PIN 58
H:UART on GPO,L:UART on DDC.
7
PIN 119
6
0.1uF
SCL_VGA
SDA_VGA
I309
CE#
SO
WP#
GND
SST25VF020A
BKLT_ADJ
SCL_VGA
SDA_VGA
T179
BKLT_ADJ
66
67
R402
2K4
SPI_CSn
SPI_DI
SPI_WPn
R363
T99
T98
SCL_DVI
SDA_DVI
4K7
T180
UART_DO
UART_DI
T103
10K
R364
3V3_DVDD
4
VOLUME
AUDIO_EN
SCL_DVI
SDA_DVI
R401
1
2
3
P304
T107
SCL
SDA
JWT-A2001WV2-03(NC)
4K7
T106
I314
CEN7002A
150(NC)
100
100
3
T100
150(NC)
4K7
0.1uF
R400
R360
4K7
0.1uF
3V3_DVDD
I311
CEN7002A
150(NC)
3V3_DVDD
I313
CEN7002A
4K7
150(NC)
R359
R404
4K7
8
7
6
5
0.1uF
R399
DDC_SDA_VGA
DDC_SCL_DVI
R403
VCC3V3
C379
T105
R365
R366
0.1uF
T104
5
1
2
3
4
10uF/16V
DDC_SCL_VGA
PBY160808T-301Y-S
VCC1V8
DDC_SCL_VGA
DDC_SDA_VGA
DDC_SCL_DVI
8
7
6
5
DDC_SDA_DVI
VCC
WP
SCL
SDA
VCC3V3
A0
A1
A2
GND
I308
DDC_SDA_DVI
1
2
3
4
24LC16B
2
AVDD_ADC_18
CRVSS
CRVSS
CRVSS
CRVSS
CRVSS
78
70
18
52
54
88
117
AVDD_DVI_18
AVDD_DVI_18
AVSS_BIAS
82
74
AVSS_ADC
AVSS_ADC
AVSS_ADC
AVSS_ADC
118
87
55
17
1
AVDD_DVI_33
AVDD_DVI_33
95
98
102
103
CVDD_18
CVDD_18
CVDD_18
CVDD_18
VSS_OUT
VSS_OUT
101
92
AVSS_DVI
AVSS_DVI
AVSS_DVI
AVSS_DVI
D
E
F
G
1
LBADC_VDD_33 116
26
48
110
AVDD_ADC_33
AVDD_ADC_33
68
71
77
79
RVDD_33
RVDD_33
107 AVSS_RPLL
AVDD_RPLL_33
A
B
C
D
E
F
G
HP L1908W
Go to cover page
36
1
1
LBADC_IN2
LBADC_IN1
PWR_KEYn
LED_A
LED_B
2
T131
T133
T140
T141
T147
2K4
R374
2K4
R372
T134
T132
VCC5V
3
3
2
2
4
VCC5V
R370
10K
10K
R371
4
Q308
MMBT3904
VCC5V
Q307
MMBT3904
2
T130
CH3P_LV_E
CH3N_LV_E
CLKP_LV_E
CLKN_LV_E
CH2P_LV_E
CH2N_LV_E
CH1P_LV_E
CH1N_LV_E
CH0P_LV_E
CH0N_LV_E
CH3P_LV_O
CH3N_LV_O
CLKP_LV_O
CLKN_LV_O
CH2P_LV_O
CH2N_LV_O
CH1P_LV_O
CH1N_LV_O
CH0P_LV_O
CH0N_LV_O
T136
6
R380
100
100
10K
CH3P_LV_E
CH3N_LV_E
CLKP_LV_E
CLKN_LV_E
CH2P_LV_E
CH2N_LV_E
CH1P_LV_E
CH1N_LV_E
CH0P_LV_E
CH0N_LV_E
CH3P_LV_O
CH3N_LV_O
CLKP_LV_O
CLKN_LV_O
7
T115
T120
R378
10K
R379
T110
T125
LED_BLUE
LED_AMBER
10K
3V3_DVDD1
CH2P_LV_O
CH2N_LV_O
CH1P_LV_O
CH1N_LV_O
CH0P_LV_O
CH0N_LV_O
T142
R373
3V3_DVDD1
R383
3V3_DVDD1
LBADC_IN2
T116
T121
R375
R376
R377
8
T111
T126
T117
T122
T112
T127
9
T118
T123
T113
T128
VLCD
T119
T124
10
T114
VLCD
P306
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
11
CVILUX-CF25302D0R0
T129
USE FFC WIRE FOR LVDS INTERFACE
,P308
T139
C386
T138
0.1uF
BLUE_LED
AMBER_LED
KEY_PWRn
C385
KEY_MENUn
KEY_DOWNn
KEY_UPn
T146
0.1uF
T145
C384
T144
0.1uF
T137
Del R385,C389,T143,P307
200
75/1%
1K
27K
15K
27K
C392
R381
R382
R384
0.1uF
T148
C391
POWER
0.1uF
DOWN
0.3V
11
C390
2.00V
10
0.1uF
9
C388
1.63V
8
0.1uF
MENU /UP
2.46V
7
C387
5
0.1uF
6
LBADC_IN1
T135
Q306
MMBT3906
5
6.8 HP_L1908W_SCHEMATICS_INTERFACE BD_KEY & PANEL INTERFACE
A
LED_B
LED_A
PWR_KEYn
LBADC_IN1
LBADC_IN2
2
1
3
B
C
D
E
F
G
1
12
Add
P311
KEY_PWRn
AMBER_LED
BLUE_LED
KEY_MENUn
KEY_DOWNn
KEY_UPn
12
PCB No.
13
P311
CON8
6832176900P02
13
FFC 8Pin
1
2
3
4
5
6
7
8
9
10
3
1
3
1
A
B
C
D
E
F
G
HP L1908W
Go to cover page
37
1
P309
PH-JACK-3P (Green)(NC)
3
2
1
COLOR IS GREEN
AUDIO_EN
VOLUME
T149
T157
FB320
AUDIO_EN
VOLUME
2
2
T167
R392
T174
R395
C395
3
10nF(NC)
D325
2
T168
T175
2
4
FB318
T150
PBY160808T-301Y-S(NC)
5
T151
R386
R387
1K(NC)
1K(NC)
C405
T173
0.1uF(NC)
C400
T166
6
AUDIO_IN_L
VDD
AUDIO_IN_R
R389
R388
T159
100(NC)
FB319
PBY160808T-301Y-S(NC)
C396
T165
R391
51K(NC)
5
120K(NC) 0.1uF(NC)
R396
47K(NC) 47K(NC)
R390
47K(NC)
Q309
R394
T172
MMBT3906(NC)
R393
2K4(NC)
4
6
10nF(NC)
VDD
VDD
Q310
MMBT3904(NC)
3
2K4(NC)
VDD
2K4(NC)
PBY160808T-301Y-S(NC)
EGA10603V05A1(NC)
EGA10603V05A1(NC)
D324
6.9 HP_L1908W_SCHEMATICS_AUDIO
A
B
C
D
E
F
G
1
1
3
3
1
7
T156
T160
0.47uF/0805(NC)
8
C393
0.47uF/0805(NC)
T152
C394
T158
0.47uF/0805(NC)
0.47uF/0805(NC)
0.3V~3.6V
C403
T153
9
AMP_IN_LAMP_IN_L+
AMP_IN_RAMP_IN_R+
T163
AMP_STBYn
9
LOUT+ 12
LOUT- 10
10
7 LIN8 LIN+
ROUT+ 20
ROUT- 2
I310
5 RIN4 RIN+
AGND 17
PW_GND 1
PW_GND 11
NC 13
FADE 15
SE/BEL 19
14 SHUTDOWN
6 VDD
3 PVDD
9 PVDD
T170
FB322
10
0(NC)
TPA6021A4(NC)
16 BYPASS
AMP_VOLUME 18
VOL
AMP_PASS
C404
0.47uF/0805(NC)
C399
T164
C397
C398
C402
8
100uF/16V(NC0).47uF/0805(NC)0.47uF/0805(NC)0.47uF/0805(NC)
C401
AMP_5V
FB321
T169
PBY160808T-600Y-S(NC)
7
OUT_L+
OUT_L-
OUT_R+
OUT_R-
T171
11
11
T154
T161
12
T155
T162
12
PCB No.
OUT_L+
OUT_LOUT_ROUT_R+
P310
13
1
2
3
4
JWT-A2001WV2-04(NC)
13
6832176900P02
A
B
C
D
E
F
G
HP L1908W
Go to cover page
38
P600
1
2
3
4
5
6
7
8
1
1
2
KEY_POWERn
LED_AMBER
LED_GREEN
KEY_MENUn
KEY_DOWNn
KEY_UPn
2
3
3
S604 1
3
4
2
4
2
4
2
4
2
4
4
UP KEY
S603 1
3
DOWN KEY
S602 1
3
MENU KEY
S601 1
3
POWER KEY
6.10 HP_L1908W_SCHEMATICS_FUNCTION_KEY_BD
A
B
C
D
E
F
G
10
9
5
6
7
8
-
LED_AMBER
MENU
8
LED_AMBER
7
LED_GREEN
6
LED_GREEN
KEY_POWERn
KEY_MENUn
KEY_DOWNn
KEY_UPn
5
9
9
C612
0.1uF
C611
11
LED_AMBER
4
D601
2
LED_GREEN
3
+
11
Delete R608
LED
1
10
0.1uF
10
12
12
13
13
6832192800P0B
POWER
PCB No.
A
B
C
D
E
F
G
HP L1908W
Go to cover page
39
3
6.11 HP_L1908W_LAYOUTS_POWER BOARD
2
4
5
6
7
8
9
10
11
12
13
A
1
A
13
B
12
B
11
C
10
C
9
D
8
D
7
E
6
E
5
F
4
F
3
G
2
G
1
PCB No.
HP L1908W
Go to cover page
40
3
6.12 HP_L1908W_LAYOUTS_INTERFACE BOARD
2
4
5
6
7
8
9
10
11
12
13
A
1
A
13
B
12
B
11
C
10
C
9
D
8
D
7
E
6
E
5
F
4
F
3
G
2
G
1
PCB No.
HP L1908W
Go to cover page
41
3
4
6.13 HP_L1908W_LAYOUTS_FUNCTION KEY BOARD AND USB BOARD
2
5
6
7
8
9
10
11
12
13
A
1
A
13
B
12
B
11
C
10
C
9
D
8
D
7
E
6
E
5
F
4
F
3
G
2
G
1
PCB No.
HP L1908W
Go to cover page
42
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