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BenQ
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L1908W
Service Manual
115 pgs2.26 Mb0

BenQ L1908W, L1908WM, L1908WI Service Manual

19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
Service
Service
Service
Horizontal Frequency
TABLE OF CONTENTS
Description Page Description Page
Table Of Contents.......……..............................…........1
Revision List.…........................................……......2
1. Monitor Specification..............................………........4
2. LCD Monitor Description…………………………….......7
3. Operation Instruction…………...............……................8
3.1. General Instructions...........................…....................8
3.2. Control Button…………….…..............……................8
3.3 Adjusting the Picture...........................…....................9
4. Input/Output Specification............…………….............13
4.1. Input Signal Connector............…………..................13
4.2. Factory Preset Display Modes......………................14
5. Panel Specification.....………………...........................15
5.1. General Feature…….....………………….................15
5.2. Optical Characteristics…………………..…………17
5.3 Parameter guide line for CCFL Inverter…………20
6. Block Diagram……...................…………................22
6.1 Software Flow Chart………………………………...22
6.2.Electrical Block Diagram……………..….......24
7. Schematic……………......................................26
8.PCB Layout..…….......................................35
8.1. Main Board………........................................35
8.2. Power Board….......................................37
9. Maintainability……….......................................40
9.1. Equipments and Tools Requirement..............40
9.2. Trouble Shooting………..............................41
10 White-Balance, Luminance adjustment...51
11. Monitor Exploded View………………..…....….......53
12. BOM List………………………………..……………54
13. Different Parts List…....................................66
SAFETY NOTICE
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS
AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING ELECTRONIC
EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
1
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
Revision List
Version Date Revision History TPV Model Name
T98AGHDKW9HPNNE
T98AGHDBW9HPNNE
T98MGHDKW9HPNNE
A00 Mar.-26-2008
Add L1908wm MODEL In Item 13
Add L1908wi MODEL In Item 13
Add Second Panel list in Item 5
Add L1908w MODEL In Item 13
Add L1908wm MODEL In Item 13
A01 Apr.-18-2008
Initial release
T98AGHDDW9HPNNE
T98MGHDTW9HPNNE
T98SGHDTW9HPNNE
T98SGHDBW9HPNNE
T98SGHDKW9HPDNE
T98MGHDLW9HPDNE
T98MGHDKW91HNNE
M190PW01 V0
M190A1-L07 C2
LTM190M2-L31
T98MGHDBW9HPNNE
T98AGHDDW9HPDNE
T98AGHDBW91HNNE
T98SGHDBW91HNNE
T98MGHDBW9HPNNE
T98AGHDBW91HNNE
Add L1908wi MODEL In Item 13
Add Second Panel list in Item 5 LM190WX1-TLE1
A02 Nov.-05-2008
Add L1908w MODEL In Item 13
Add L1908wi MODEL In Item 13
T98SGHDBW91HNNE
T98MGHDBW9HPNNE
T98SGHDKW91HNNE
T98GGHDKW9HPNNE
T98SGHDKW9HPN1E
T98MGHDBW91HNCE
T98SGHDBW9HPN1E
T98MGHDBW9HPNCE
T98MGHDTW9HPNCE
T98GGHDBW91HNNE
T98SGHDBW91HN1E
T98MGHDBW91HNNE
T98SGHDKW91HN1E
T98AGHDKW91HNNE
T98MGHDKW91HNCE
Add L1908wm MODEL In Item 13
2
T98AGHDKW9HPDNE
T98MGHDKW9HPDNE
T98AGHDLW9HPDNE
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
T98SGHDLW9HPDNE
T98AGHDTW9HPDNE
T98MGHDTW9HPDNE
T98SGHDTW9HPDNE
T98SGHDKW9HPD1E
T98MGHDDW9HPDNE
T98SGHDLW9HPD1E
T98GGHDKW9HPNNE
Add L1908w MODEL In Item 13
A03 Dec.-04-08
Add L1908wi MODEL In Item 13
Add L1908wm MODEL In Item 13
T98AGHDBW9HPNCE
T98SMRDKW9HPNNE
T98SMRDBW9HPNNE
T98AGHDBW91HNCE
T98SMRDKW91HNNE
T98AGHDKW9HPDNE
T98MGHDLW9HPDCE
3
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
1. Monitor Specification
4
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
5
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
6
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
(
2. LCD Monitor Description
The LCD Monitor will contain main board, power board, a key board which house the flat panel control logic, brightness
control logic and DDC.
The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips each
voltage.
Power Board
Include adapter board)
AC-IN
110V-240V
Monitor Block Diagram
CCFT Drive.
Main Board
Keyboard
Flat Panel and
CCFL backlight
RS232 Connector
For white balance
adjustment in
factory mode
Video signal, DDC
HOST Computer
7
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
3. Operation Instructions
3.1 General Instructions
Press the power button to turn the monitor on or off. The other control buttons are located at front of the panel. By
changing these settings, the picture can be adjusted to your personal performance.
The power cord should be connected and insert to adaptor.
-
Connect the video cable from the monitor to the computer VGA card.
-
- Press the power button to turn on the monitor, the power indicator will light up to Green.
3.2 Control Button
8
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
3.3 Adjust the Picture
9
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
10
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
11
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
12
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
4. Input/Output Specification
4.1 Input Signal Connector
4.1.1 D-SUB connector
Pin Signal Pin Signal
1 Red Video 9 3.3/+5 V (from PC)
2 Green Video 10 Sync Ground
3 Blue Video 11 None
4 None 12 DDC Data
5 Ground (DDC Return) 13 Horizontal Sync
6 Red GND 14 Vertical Sync
7 Green GND 15 DDC Clock
8 Blue GND
VGA connector layout
PIN 1
PIN 11
4.1.2 DVI connector (Only for L1908wm)
PI N NO. DESCRIPTION PI N NO. DESCRIPTION
1.
2.
3.
4.
5.
6.
7.
TMDS data 2－
TMDS data 2＋
TMDS data 2/4 Shield
TMDS data 4－
TMDS data 4＋
DDC Clock
DDC Data 19. TMDS data 0/5 Shield
PIN 5
13.
14.
15.
16.
17.
18.
TMDS data 3＋
＋5V Power
GND(return for +5v,hsync,vsync)
Hot Plug Detect
TMDS data 0－
TMDS data 0＋
8.
9.
10.
11.
12.
Analog Vertical Sync 20.
TMDS data 1－
TMDS data 1＋
TMDS data 1/3 Shield 23. TMDS Clock +
TMDS data 3－
24 - Pin Color Display Signal Cable
21.
22. TMDS Clock Shield
24.
TMDS data 5－
TMDS data 5＋
TMDS Clock －
13
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
4.2 Factory Preset Display Modes
14
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
5. Panel Specification
5.1 General Feature
M190PW01 V0
M190A1-L07 C2
LTM190M2-L31
15
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
LM190WX1-TLE1
16
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
5.2 Optical Characteristics
M190PW01 V0
M190A1-L07 C2
17
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
LTM190M2-L31
18
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
LM190WX1-TLE1
19
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
5.3 Parameter guide line for CCFL Inverter
1.TFT LCD Module:
M190PW01 V0
M190A1-L07 C2
LTM190M2-L31
LM190WX1-TLE1
20
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
2.Back Light Unit:
M190PW01 V0
M190A1-L07 C2
LTM190M2-L31
LM190WX1-TLE1
21
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
6. Block diagram
6. 1 Software Flow Chart
1
Y
2
N
3
4
5
N
Y
6
N
7
8
Y
9
10
N
11
12
Y
13
N
N
Y
14
15
Y
N
16
Y
17
18
N
19
Y
22
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
REMARK:
1) MCU initialize.
2) Is the EEprom blank?
3) Program the EEprom by default values.
4) Get the PWM value of brightness from EEprom.
5) Is the power key pressed?
6) Clear all global flags.
7) Are the AUTO and SELECT keys pressed?
8) Enter factory mode.
9) Save the power key status into EEprom.
Turn on the LED and set it to green color.
Scalar initialize.
10) In standby mode?
11) Update the lifetime of back light.
12) Check the analog port, are they’re any signals coming?
13) Does the scalar send out an interrupt request?
14) Wake up the scalar.
15) Are there any signals coming from analog port?
16) Display "No connection Check Signal Cable" message. And go into standby mode after the message
disappear.
17) Program the scalar to be able to show the coming mode.
18) Process the OSD display.
19) Read the keyboard. Is the power key pressed?
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19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
6.2 Electrical Block Diagram
6.2.1 Scalar Board
EEPROM
(I308)
EPR_SDA
EPR SCL
H sync
V sync
D-Sub Connector
RGB
(P302)
DB15_SDA,
DB15 SCL
Panel Interface
(P306)
Scalar GM5726H-LF-AB
(Include ADC、OSD、MCU)
(I309)
Crystal
X301
14.318Mhz
EEPROM
M24C02
(I304)
24
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
6.2.2 Inverter / Power Board
AC input
EMI filter
Bridge
Rectifier
and Filter
Start Circuit
PWM
Control IC
Transformer
Over
Voltage
Protect
Rectifier
diodes
12V
Feedback
Circuit
5V
Lamp
LC
Resonance
Transformer
MOSFET
Feedback
Circuit
Over
Voltage
PWM
Control IC
ON/OFF
Control
DIM
ON/OFF
25
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
7. Schematic
POWER BOARD
26
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
INTERFACE BOARD TOP
27
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
INTERFACE BD_POWER
28
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
INTERFACE BD_ VGA＆DDC INTERFACE
IC901
29
19" LCD Color Monitor HP L1908w / L1908wm / L1908wi
SCALER GM5726H
30
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