19" LCD Color Monitor |
HP L1908w / L1908wm / L1908wi |
Service
Service
Service
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Horizontal Frequency |
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2483 kHz |
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TABLE OF CONTENTS |
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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
10White-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 |
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Revision List |
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Version |
Date |
Revision History |
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T98AGHDKW9HPNNE |
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T98AGHDBW9HPNNE |
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T98MGHDKW9HPNNE |
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Initial release |
T98AGHDDW9HPNNE |
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T98MGHDTW9HPNNE |
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T98SGHDTW9HPNNE |
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A00 |
Mar.-26-2008 |
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T98SGHDBW9HPNNE |
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T98SGHDKW9HPDNE |
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Add L1908wm MODEL In Item 13 |
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T98MGHDLW9HPDNE |
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T98MGHDKW91HNNE |
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Add L1908wi MODEL In Item 13 |
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M190PW01 V0 |
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Add Second Panel list in Item 5 |
M190A1-L07 C2 |
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LTM190M2-L31 |
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T98MGHDBW9HPNNE |
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Add L1908w MODEL In Item 13 |
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T98AGHDDW9HPDNE |
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Add L1908wm MODEL In Item 13 |
T98AGHDBW91HNNE |
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T98SGHDBW91HNNE |
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A01 |
Apr.-18-2008 |
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T98MGHDBW9HPNNE |
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T98AGHDBW91HNNE |
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Add L1908wi MODEL In Item 13 |
T98SGHDBW91HNNE |
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T98MGHDBW9HPNNE |
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T98SGHDKW91HNNE |
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Add Second Panel list in Item 5 |
LM190WX1-TLE1 |
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A02 |
Nov.-05-2008 |
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T98GGHDKW9HPNNE |
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T98SGHDKW9HPN1E |
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Add L1908w MODEL In Item 13 |
T98MGHDBW91HNCE |
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T98SGHDBW9HPN1E |
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T98MGHDBW9HPNCE |
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T98MGHDTW9HPNCE |
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T98GGHDBW91HNNE |
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T98SGHDBW91HN1E |
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Add L1908wi MODEL In Item 13 |
T98MGHDBW91HNNE |
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T98SGHDKW91HN1E |
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T98AGHDKW91HNNE |
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T98MGHDKW91HNCE |
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T98AGHDKW9HPDNE |
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Add L1908wm MODEL In Item 13 |
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T98MGHDKW9HPDNE |
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T98AGHDLW9HPDNE |
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2
19" LCD Color Monitor |
HP L1908w / L1908wm / L1908wi |
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T98SGHDLW9HPDNE |
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T98AGHDTW9HPDNE |
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T98MGHDTW9HPDNE |
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T98SGHDTW9HPDNE |
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T98SGHDKW9HPD1E |
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T98MGHDDW9HPDNE |
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T98SGHDLW9HPD1E |
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T98GGHDKW9HPNNE |
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Add L1908w MODEL In Item 13 |
T98AGHDBW9HPNCE |
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T98SMRDKW9HPNNE |
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A03 |
Dec.-04-08 |
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T98SMRDBW9HPNNE |
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T98AGHDBW91HNCE |
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Add L1908wi MODEL In Item 13 |
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T98SMRDKW91HNNE |
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T98AGHDKW9HPDNE |
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Add L1908wm MODEL In Item 13 |
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T98MGHDLW9HPDCE |
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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.
Monitor Block Diagram
CCFT Drive. |
Flat Panel and |
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CCFL backlight |
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Power Board |
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Main Board |
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RS232 Connector |
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(Include adapter board) |
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For white balance |
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adjustment in |
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factory mode |
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Keyboard |
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AC-IN |
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Video signal, DDC |
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HOST Computer |
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110V-240V |
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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.
3.2Control 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
4.1Input Signal Connector
4.1.1D-SUB connector
Pin |
Signal |
Pin |
Signal |
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1 |
Red Video |
9 |
3.3/+5 V (from PC) |
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2 |
Green Video |
10 |
Sync Ground |
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3 |
Blue Video |
11 |
None |
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4 |
None |
12 |
DDC Data |
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5 |
Ground (DDC Return) |
13 |
Horizontal Sync |
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6 |
Red GND |
14 |
Vertical Sync |
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7 |
Green GND |
15 |
DDC Clock |
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8 |
Blue GND |
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VGA connector layout
PIN 1 |
PIN 5 |
PIN 11 |
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4.1.2 DVI connector (Only for L1908wm)
PI N NO. |
DESCRIPTION |
PI N NO. |
DESCRIPTION |
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1. |
TMDS data 2 |
13. |
TMDS data 3 |
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2. |
TMDS data 2 |
14. |
5V Power |
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3. |
TMDS data 2/4 Shield |
15. |
GND(return for +5v,hsync,vsync) |
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4. |
TMDS data 4 |
16. |
Hot Plug Detect |
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5. |
TMDS data 4 |
17. |
TMDS data 0 |
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6. |
DDC Clock |
18. |
TMDS data 0 |
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7. |
DDC Data |
19. |
TMDS data 0/5 Shield |
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8. |
Analog Vertical Sync |
20. |
TMDS data 5 |
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9. |
TMDS data 1 |
21. |
TMDS data 5 |
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10. |
TMDS data 1 |
22. |
TMDS Clock Shield |
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11. |
TMDS data 1/3 Shield |
23. |
TMDS Clock + |
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12. |
TMDS data 3 |
24. |
TMDS Clock |
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24 - Pin Color Display Signal Cable
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 
3
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4
5 |
N |
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Y |
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6 |
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N
7 8
Y
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N |
11 |
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Y |
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N |
12 |
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13 |
N |
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Y |
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Y |
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14 |
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15 |
N |
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16 |
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Y |
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17 |
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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?
23
19" LCD Color Monitor |
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HP L1908w / L1908wm / L1908wi |
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6.2 Electrical Block Diagram |
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6.2.1 Scalar Board |
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Panel Interface |
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(P306) |
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EPR_SDA |
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EEPROM |
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EPR SCL |
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Scalar GM5726H-LF-AB |
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(I308) |
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(Include ADC OSD MCU) |
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(I309) |
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H sync |
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V sync |
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RGB |
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D-Sub Connector |
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Crystal |
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(P302) |
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X301 |
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14.318Mhz |
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DB15_SDA, |
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DB15 SCL |
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EEPROM |
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M24C02 |
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(I304) |
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24
19" LCD Color Monitor |
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HP L1908w / L1908wm / L1908wi |
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6.2.2 Inverter / Power Board |
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AC input |
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Bridge |
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Rectifier |
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EMI filter |
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Transformer |
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Rectifier |
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diodes |
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and Filter |
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Start Circuit |
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12V |
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Over |
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Feedback |
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PWM |
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Circuit |
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Voltage |
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5V |
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Control IC |
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G |
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Protect |
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ON/OFF
LC |
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Transformer |
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MOSFET |
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Resonance |
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Lamp
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Over |
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ON/OFF |
Feedback |
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PWM |
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Circuit |
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Voltage |
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Control |
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Control IC |
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DIM |
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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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