AOC L1908W Service Manual

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. ----------------------------------------------------------- 10

Assembly and Disassembly Procedures

05. Troubleshooting---------------------------------------------------------------------------------------- 18

06. Schematics and Layouts------------------------------------------------------------------------------ 30

AppendixI:UsersManual

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.

27th-Jul.-2007

Product Anouncement:

Important Safety Notice

HP L1908W

Go to cover page

This product is certificated to meet RoHS Directive and

Lead-Free produced definition. Using approved critical

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

Using Lead-Free solder to well mounted the parts.!

! The fusion point of Lead-Free solder requested in the

degree of 220 C.°

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.

HP L1908W

Go to cover page

1. Circuit Description

1.1 Power Board Operation Theory:

1.1.1 Line Filter:

It consists of C801, T801, C802, C803, C804,

C808, C809, C815, C819, C820, C825, and

eliminates the high frequency interference to

meet EMI's requirement.

1.1.2 Rec & Filter:

Bridge diodes D812, D813, D814, D815 convert

AC source into pulse DC. This pulse DC is

smoothed and filtered by C805 and R802 which is

an NTC (Negative Thermal Coefficient ) resistor,

and used to reduce inrush current within safe

range.

1.1.3 Power Transformer:

T802 converts energy into square wave given by

power source C805 as a filter on

the secondary winding of bridge rectifier to

generate +5V, +12V, and +22V.

1.1.4 Output:

The square wave from T802 is rectified by D808

D809, D810, then filtered by C817, C818, C824,

C823, C830, C833, C822 to generate +22.5V and

+12V, +5V respectively.

1.1.5 Driver:

Q803 drive T802 through PWM (Pulse-width

modulation) control of I801 for power converted.

1.1.6 FeedBack:

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

at a stable level.

1.1.7 PWM :

(Pulse-width modulation)

1.1.7a Start:

When AC power switch is turned on. C807

is charged a 11V and an initial current

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

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.

capacitor-input

R811 exceed

1.17c Regulation:

If output voltage +22V goes up, the R

terminal of I803 gets more bias,

accordingly photo transistor and photo

diode flow more current. The voltage of

pin2 goes up too, making the pulse width

of pin6 to become narrower. So the output

voltage +22V will be pulled down to a

stable value.

1.1.7d OVP:

If +22.5V goes up too much, the induced

voltage on pin4 of T802 becomes large

also. Suppose that voltage is over 20V,

the pulse train at pin6 goes down to zero,

shutting the Q803 off immediately.

1.1.7f SCP:

If output terminal is short to ground, photo

transistor does not conduct, hence I802

does not conduct either. Then oscillation

of I801 is stop, shutting Q803 off

Power Board Block Diagram

Rec. & FilterLine Fil ter

PWM

Power

Transformer

Driver

Feedback

1.2 Inverter Circuit:

This unit operates on an output voltage of 22V given by

power source.

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.

Output Rec. &

Filter

1. Circuit Description (continued)

HP L1908W

Go to cover page

1.2.2b OSC:

When I101 enabled, C104, R118, R107 (pin13

of I101) determine the operating frequency.

1.2.2c SST:

C106 (pin12 of I101) provides soft start

function.

1.2.2d Ignition:

IC provides higher operating frequency

internally for more striking voltage until

regulation of feedback of lamp current. And it

provides 2 second striking time.

1.2.2e Dimming control:

The external PWM voltage of R136 and C111

control the duty pulse of burst-mode to drive

and perform a wide dimming control for the

CCFL. The burst-mode frequency is

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.

1.2.5 Feedback:

D116, D117, D120, D121, R111, R130 detect the

lamp current for negative feedback and

regulation.

Inverter Board Block Diagram

VCC

VDD

Half-bridge

Switching

ON/OFF

Brightness

Control

Control IC: OZ9938

Enable

OSC

SST

Dimming

Control

Output Driver

Protection

Ignition

Regulation

1.3 Interface Operation:

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 control.

GM5726H (GM5766H)

1.3.2b I302, 3-terminal regulator:

A 3.3V power supply for I306 scaler IC

GM5726H (GM5766H)

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)

from the 3.3V source (I302).

Transformer Lamp

Detection

Feedback

and I308 EEPROM

, it is generated

HP L1908W

Go to cover page

1. Circuit Description (continued)

1.3.2d Q302, I301:

The circuitry is functions of ON/OFF control

capable of initial the LCD module power on or

shut its power off (PANELVCC_EN) is

performed for power ON/OFF and also for the

power saving sequence. It supports 5V to

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

performed for black light power ON/OFF and

also for the power saving sequence. The

BKLT_EN signal is generated from I306

scaler IC

3.2f Q301, R301, R302, R304:

Adjusting backlight luminance of LCD

module, it s adjusted back light luminance

control (BKLT_ADJ) is performed for the back

light luminance. The BKLT_ADJ signal is

generated from I306 scaler IC

(GM5766H)

1.3.3 VGA & DDC interface (Circuit diagram sheet 4 of 8):

This sheet has RGB analog video and H/V sync

signals input from VGA connector.The RGB analog

video signals input through AC-coupled, analog

video signal is used to clamp the black level at 0V.

And H/V sync to scaler. Support EDID plug & play

function for analog video. It is to support VESA

DDC/CI interface for analog video.

1.3.3a P302 connector:

The RGB analog video and H/V sync input

signals to I306 scaler Gm5726H (Gm5766H).

The VESA DDC/CI function is through IIC bus

to I306 scaler IC .

1.3.3b I304, EDID EEPROM (24LC02B):

The I304 is support EDID information of the

VESA standard for VGA interface and support

plug and play for the PC host.

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

for DVI V1.0 standard. And support EDID plug&play

function for digital video. It supports VESA DDC/CI

interface, and support HDCP function.

GM5726H

GM5726H (GM5766H)

1.3.4a P303 connector:

P303 is DVI-D connector for DDWG standard,

it has digital video signals (TMDS) to I306

scaler IC . The VESA

DDC/CI function is through I2C bus to I306

GM5726H (GM5766H)

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):

The I306 is all-in-one LCD

monitor controller. It leverages Genesis patented

advanced image-processing technology as well as a

proven integrated ADC/PLL. Furthermore, it

integrates HDCP function, a micro-controller, an

OSD controller, and dual LVDS.

The RGB analog video signal from video input circuit

enter to incorporated A/D converted block (ADC) into

the digital data for analog video signal. The TMDS

digital signals input (with HDCP) entered from the

DVI-D connector is converted into the digital data.

Based on this conversion, this device performs

interpolation during pixel extension. These

interpolation digital data are transformed to LVDS

signal. The I306 source voltage is 3.3V and 1.8V, the

device clock source frequency is 14.318 MHz. And

support DDC/CI interface of VESAand function key

operation.

3.5a I308 EEPROM (24LC16B):

1.3.5b I309 SPI Flash ROM:

1.3.5c I307 Microprocessor Supervisory Circuit:

GM5726H (GM5766H)

The control data and parameter, and OSD

related setting, and other service data, to be

stored in I308. The contents of which are

updated as required.

The firmware program running from I309

external SPI flash ROM, contains firmware

code and data for all firmware function. The

device is 2Mbits of flash ROM.

The function of this device is to assert a reset

to I306 scaler GM5726H (GM5766H), when

either the power supply dropped down.

GM5726H (GM5766H)

. And it supports HDCP

1. Circuit Description (continued)

HP L1908W

Go to cover page

1.3.5d X301 14.318MHz:

It generates reference clock input for I306

scaler.

1.3.5e ISP and DDC/CI function:

The DDC/CI is VESA standard for the host PC

system, it can through I2C bus to control LCD

monitor. Enter I306 pin64 DDC_SCL_A and

pin65DDC_SDA_A of the VGA port. Enter I306

pin66 DDC_SCL_D pin67 DDC_SDA_D of the

DVI-D port. It use ISP function when change

new firmware to I309 SPI flash ROM, it used

IIC bus from VGA or DVI-D port through I306

to I309 SPI flash ROM.

1.3.5f The power save sequence function:

First I306 pin49 (BKLT_EN) set Low to disable

LCD module back light power, delay of some

time, then I306 pin127 (PANELVCC_EN) set

Low to disable LCD module power, then I306

enter to power down mode.

1.3.6 Key & Panel interface (Circuit diagrams sheet 7of 8):

1.3.6a P306 connector:

It is LVDS bus, it is from I306 scaler to LCD

panel module. The P306 output voltage is 5V.

1.3.6b P307 and P308 connector:

The P307/P308 has support keypad function.

Control is given effect for the push switch to be

used when the user changes the parameters,

in order to modify the respective setting

values. Whether the switch has been pressed

is identified with the switch input level change

of I306. Relate ports of I306 based on Table 1.

Each parameter is stored in the I308EEPROM,

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.

Table 1 Related ports of I306

Pin No. I/O Signal name Function Remarks

Pin 113 I KEY_POWER Soft power s witch input Power k ey

Pin 115 I KEY_MENU Enter OSD s witc h input Enter O SD 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 func tion

1.3.7 Audio (Circuit diagrams sheet 8of 8):

1.3.7a P309 connector:

The P309 is audio signal input from the audio

source.

1.3.7b P310 connector:

The P310 is audio output to speaker and

support 2Wx2speakers.

1.3.7c I310 TPA6021A4:

The I310 is 2x2W stereo audio amplifier, it is

an integrated class-AB dual output amplifier.

1.3.7d Q309:

Power down and mute control for Audio

ON/OFF control (AUDIO_EN) is performed for

standby mode and mute function. It supports

5V to audio IC power. The AUDIO_EN signal is

generated from I306.

1.3.7e R394, Q310, volume control for Audio:

Volume control (volume) is performed for

audio output signal power. The volume signal

is generated from I306.

1.3.8 Others:

1.3.8a Detection of POWER ON status:

The I306 is identified the ON status of two

modes for the power supplies. The

identification is made when the power supply

is turn off. For example, if the power supply is

turn off with the POWER key switch, the

POWER key switch must be turn on when

active the power supply again. If the power

supply turned off by the pulling out the power

cord, then this power supply can to be turned

on by connecting the power cord, without

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

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.

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

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.

- If there is no horizontal sync signal input

- If there is no vertical sync signal input.

- If the horizontal sync signal is outside the measuring

range of I306.

- If the vertical sync signal is outside the measuring

range of I306.

Table 3 the Hsync,Vsync distinction

Indication

resolution

640 x 480

720 x 400

800 x 600

832 x 624

1024 x 768

1152x720

1152 x 870

1152 x 900

1280x768

1280x960

1280 x 1024

1440x900

Distinction Hsync Distinction Vsync The fixed

30.5KHz≦fH≦32.5KHz 59Hz≦fV≦61Hz

36.5KHz≦fH≦38.5KHz 74Hz≦fV≦76Hz

30.5KHz≦fH≦32.5KHz 69Hz≦fV≦71Hz

36.9KHz≦fH≦38.9KHz 59.3Hz≦fV≦61.3Hz

45.9KHz≦fH≦47.9KHz 74Hz≦fV≦76Hz

48.7KHz≦fH≦50.7KHz 73.5Hz≦fV≦75.5Hz

47.4KHz≦fH≦49.4KHz 59Hz≦fV≦61Hz

59KHz≦fH≦61KHz 74Hz≦fV≦76Hz

43.9KHz≦fH≦45.9KHz 59Hz≦fV≦61Hz

67.7KHz≦fH≦69.7KHz 74Hz≦fV≦76Hz

70.7KHz≦fH≦72.7KHz 75Hz≦fV≦77Hz

46.4KHz≦fH≦48.4KHz 59Hz≦fV≦61Hz

59KHz≦fH≦61KHz 59Hz≦fV≦61Hz

62.9KHz≦fH≦64.9KHz 59Hz≦fV≦61Hz

79KHz≦fH≦81KHz 74Hz≦fV≦76Hz

55KHz≦fH≦57KHz 59Hz≦fV≦61Hz

1.3.8c Power ON sequence

When the POWER key switch is pressed, the

POWER key switch signal is turned H . When this

H potential is detected, the CPU begins to

establish the respective power supplies according

to the sequence show below.

mode

Table 2 video model

Band W idth

(KHz )

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 - -

8 1024x768 (75Hz) 60.023 78.75 - -

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 - +

(M H z)

Po lar ityM o d e Reso lu tio n H-F r eq

Power Key

296ms

LED Green

PANELVCC_EN

BKLT_EN

AUDIO_EN

516ms

825ms

3.68s

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 potential is detected,

the CPU begins to turn off the respective power

supplies according to sequence show below.

Power Key

140ms

LED Green

460ms

PANELVCC_EN

157ms

BKLT_EN

AUDIO_EN

140ms

1. Circuit Description (continued)

HP L1908W

Go to cover page

1. 3.8e List of I/O Pin Assignments of the I306:

Pin No. Port Signal Name

113 LBADC _IN3 PWR_KEYn H O N/OF F 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_DO WNn H O SD down/ minus enable when is 2.0V

86 GPIO31 HDCP_HPDn L DVI HPD enable when is L

122 G PIO10 SC L H EEPR OM cloc k signal of IIC bus

123 G PIO11 SD A H EEPROM data signal of IIC bus

50 GPO4 BKLT_ADJ - Backlight br ightnes s control

124 G PIO12 D DC_WPn L DDC EEPROM write p rotect ion when is L

51 GPO0 AUDIO_EN L Audio enable when is H

56 GPO1 VOLUME L Audio v olume

121 GPIO9 VG A_DETn H VGA cable c onnected when is L

120 GPIO8 DVI_DETn H DVI cable connec ted when is L

58 GPO3 UART_DO H UART interface data O UT

57 GPO2 UART_DI H UART interface dat a IN

127 PPWR PANELVCC_EN L Panel power enable when is H

49 PBIAS BKLT_EN L Back light power enable when is H

64 GPIO16 DDC_SCL_VGA H DDC/CI interfac e for VGA

65 GPIO17 DDC_SDA_VGA H DDC/ CI interface for VG A

66 GPIO18 DDC_SCL_DVI H DDC /CI interface for D VI

67 GPIO19 DDC_SDA_DVI H DDC/CI interface for DVI

Initial

Setting

Function

1.3.9 Miscellaneous:

1.3.9a Connector Pin Assignments:

VGA Analog Connector Pinout

PIN MNEMONIC SIGNAL 1 RV Red Video 2 GV Green Video 3 BV Blue V ide o 4 NC None 5 GND Ground (DDC Return) 6RG RedGND 7 GG Green GND 8BG BlueGND 9 +3.3/+5 V +3.3/+5 V (from PC) 10 SG Sync Ground 11 NC None 12 SDA DDC Data 13 HS Horizontal Sync 14 VS Vertical Sync 15 SCL DDC Clock

1.3.9b LED Indicator:

Full Power - HP branded models Green

Sleep - all models Amber

Sleep Timer activated Sleep Mode Flashing Amber (0.5 Hz)

1.3.9c Factory Preset Display Modes:

V-

Pola rit y

Pix el Cl k

(MHz)

Source

CVT 0.83MA

DVT 16:10

Preset

NOTE: Modes 13 thru 15 are support ed with scaled down video pri mari ly t o support navigat ion to a support ed ti ming mode.

Pix el

Format

1 640 x 480 31. 47 - 59.94 - 25.175 VGA

2 640 x 480 37. 5 - 75 - 31. 5 VGA

3 720 x 400 31. 47 - 70.08 + 28. 321 VGA

4 800 x 600 37. 88 + 60. 32 + 40 VESA

5 800 x 600 46. 88 + 75 + 49.5 VESA

6 832 x 624 49. 72 74.55 57.283 MAC

7 1024 x 768 48.36 - 60 - 65 VESA

8 1024 x 768 60.02 - 75. 03 - 78. 75 VESA

9 1152 x 720 44.86 - 60 + 66.75

10 1152 x 870 68.68 75.06 100 MAC

11 1152 x 900 61.8 65.96 92.978 SUN

12 1280 x 768 47.396 + 60 - 68.25 CVT 0.98M9-R

13 1280 x 960 60 60 108 VESA

14 1280 x 1024 63.98 + 60.02 + 108 VESA

15 1280 x 1024 79.98 + 75.02 + 135 VESA

16 1440 x 900 55.94 - 59. 89 + 106.5 CVT 1. 30MA

H-Fr eq

(kHz)H-Pola rit y

V-Fr eq

(Hz)

PI N 1

PI N 11

PI N 5

PI N 9

HP L1908W

Go to cover page

2. Packing Exploded Drawing

The Pape r m ust on top of USER'SMANUAL in orde r to p ro t ect M ANU AL

3. Product Exploded Drawing

HP L1908W

Go to cover page

HP L1908W

Go to cover page

4.1 Assembly Procedures:

Connect the cable between power board(P802) and

interface board (P301)

P301

4. Assembly and Disassembly Procedures

Use a Phillips-head screwdriver screwed the No.1~4

screws till that power board and bracket chassis base

firmly attached.

(No1 screw size=M4x8; No2~4 screw size=M3x6;

Torque=8~10KGFxCM).

P802

Connect FFC cable into interface board

Connect function key cable into interface

board(P307)

Connect speaker cable into interface board(P310)

SPEAKER

CABLE

FFC

FUNCTION KEY

CABLE

Use a Phillips-head screwdriver screwed the

No.1~4 screws till that interface board and bracket

chassis base firmly attached.

(No1~4 screw size=M3x6; Torque=8~10KGFxCM).

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.

Use PVC tape to stick the speaker cable

4. Assembly and Disassembly Procedures (continued)

HP L1908W

Go to cover page

Take the speaker cable out of the hole shown as

photo

Turn the monitor faced down and put it on the

Bracket Chassis module till both parts firmly

attached

Take lamp cables out from the holes shown as the

photo.

S10

Connect FFC cable to LCD panel. There are two

locks over here when plugging in should be

noticed

LOCK

Plug in parallel direction

Connect the FFC cable to the connector of the LCD

panel.

S11

Angel < 5 degrees

Plug 8 lamp cables to the connectors of power

board.(Both of right and left sides)

HP L1908W

Go to cover page

4. Assembly and Disassembly Procedures (continued)

S12

S13

Use a Phillips-head screwdriver screwed the No.1~4

screws on both side and assemble the LCD panel

and bracket chassis module.

(No1~4 screw size=M3x5; Torque=2.5~3KGFxCM).

Use a Phillips-head screwdriver screwed the

No.1~2 screws.

(No1~2 screw size=M3x10; Torque=4~6KGFxCM).

S16

S17

Connect function key cable into key function cable (P600)

Put the previous assembled module on the front bezel

Use a Phillips-head screwdriver screwed the

No.1~4 screws.

No1~4 screw size=M2x3.3Torque=0.8~1.2KGFxCM

S14

S15

Use a Hex-head screwdriver screwed the

bracket chassis

(No.1~4 Hex Nut screws

Size=M3x8;Torque=5~7KGFxCM).

Use a Phillips-head screwdriver screwed the bracket

chassis No.1 screw.

(No1 screw size=M3x4; Torque=4~6KGFxCM).

S18

S19

Use a Phillips-head screwdriver screwed the

No.1~4 screws.

(No1~4 screw size=M3x6; Torque=6~8KGFxCM).

Fix speaker line with hook shown as photo

+ 30 hidden pages