AOC 919sz Service Manual
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33 8. Maintainability 8.1 Equipments and Tools Requirement 1. Voltmeter. 2. Oscilloscope. 3. Pattern Generator. 4. DDC Tool with an IBM Compatible Computer. 5. Alignment Tool. 6. LCD Color Analyzer. 7. Service Manual. 8. User Manual.
34 8.2 Trouble Shooting 1. No Power OK NG No power Check power cable is tightened? Check Power “On/Off” is “On”? Re-plug the power cable Replace main board and check connections Check the LED indicate is OK? Check the AC power Replace the power board and check connections OK NG OK NG NG Turn on the Power “On/Off” switch Replace key board and check connections NG
35 2. No Video (Power LED Green) No Video (Power LED Green) Press the power button is OK? Check the LVDS/FFC cable or panel The end NG OK OK NG Replace the main board Replace the power board and connection Replace the LVDS/FFC cable or panel NG The end Replace the key board NG OK Replace the main board and connection OK
36 3. DIM OK The end OK The end OK The end DIM (image overlap, focus or flicker) Reset in factory mode Set to the optimal frequency, select the recommended fre quency Pull out signal cable and check “Self Test Feature Check” is ok? Check the signal cable and the PC Readjust the phase and pixel clock in the user mode Replace the main board Replace the panel NG NG NG OK NG NG OK The end OK NG
37 4. Color is not optimal NG Color is not optimal Miss color Color shift Replace the signal cable Pull out the signal cable and check the screen color display is normal? The end Replace the signal cable or PC Reset the factory mode In the user mode, set the “color settings” until customer satisfy Replace the main board NG OK NG OK NG
38
9. White- Balance, Luminance Adjustment
Approximately 30 minutes should be allowed for warm up before proceeding white balance adjustment.
How to setting MEM channel you can reference to chroma 7120 user guide or simpl use “SC” key and “NEXT” Key
to modify xyY value and use “ID” key to modify the TEXT description Following is the procedure to do white-balance
adjust .
2. Setting the color temp. you want
A. MEM.CHANNEL 3 Warm (6500K):
Warm color temp. parameter is x = 313 ±30, y = 329 ±30
B. MEM.CHANNEL 4 Normal (7300K):
Normal color temp. parameter is x = 302 ±30, y = 318 ±30
C. MEM.CHANNEL 9 Cool (9300K):
Cool color temp. parameter is x = 283 ±30, y = 297 ±30
D. MEM.CHANNEL 10 (sRGB color):
sRGB color temp. parameter is x = 313 ±30, y = 329 ±30
3. Enter into the factory mode
Press “MENU” button, AC off and then AC on.You will enter into the factory mode.
4. Gain adjustment:
Move cursor to “-F-” and press MENU key
A. Adjust Warm (6500K) color-temperature
1. Switch the chroma-7120 to RGB-Mode (with press “MODE” button)
2. Switch the MEM.channel to Channel 3 (with up or down arrow on chroma 7120)
3. The LCD-indicator on chroma 7120 will show x = 313 ±30, y = 329 ±30
4. Adjust the RED on factory window until chroma 7120 indicator reached the value R=100
5. Adjust the GREEN on factory window until chroma 7120 indicator reachedthe value G=100
6. Adjust the BLUE on factory window until chroma 7120 indicator reached the value B=100
7. Repeat above procedure (item 4, 5, 6) until chroma 7120 RGB value meet the tolerance =100±2
B. Adjust Normal (7300K) color-temperature
1. Switch the chroma-7120 to RGB-Mode (with press “MODE” button)
2. Switch the MEM.channel to Channel 4 (with up or down arrow on chroma 7120)
3. The LCD-indicator on chroma 7120 will show x = 302 ±30, y = 318 ±30
4. Adjust the RED on factory window until chroma 7120 indicator reached the value R=100
5. Adjust the GREEN on factory window until chroma 7120 indicator reachedthe value G=100
6. Adjust the BLUE on factory window until chroma 7120 indicator reached the value B=100
7. Repeat above procedure (item 4, 5, 6) until chroma 7120 RGB value meet the tolerance =100±2
39 C. Adjust Cool (9300K) color-temperature 1. Switch the Chroma-7120 to RGB-Mode (with press “MODE” button) 2. Switch the MEM. Channel to Channel 9 (with up or down arrow on chroma 7120) 3. The LCD-indicator on chroma 7120 will show x = 283 ±30, y = 297 ±30 4. Adjust the RED on factory window until chroma 7120 indicator reached the value R=100 5. Adjust the GREEN on factory window until chroma 7120 indicator reached the value G=100 6. Adjust the BLUE on factory window until chroma 7120 indicator reached the value B=100 7. Repeat above procedure (item 4, 5, 6) until chroma 7120 RGB value meet the tolerance =100±2 D. Adjust sRGB color-temperature 1. Switch the chroma-7120 to RGB-Mode (with press “MODE” button) 2. Switch the MEM.channel to Channel 10 (with up or down arrow on chroma 7120) 3. The LCD-indicator on chroma 7120 will show x = 313 ±30, y = 329 ±30 4. Adjust the RED on factory window until chroma 7120 indicator reached the value R=100 5. Adjust the GREEN on factory window until chroma 7120 indicator reachedthe value G=100 6. Adjust the BLUE on factory window until chroma 7120 indicator reached the value B=100 7. Repeat above procedure (item 4, 5, 6) until chroma 7120 RGB value meet the tolerance =100±2 E. Turn the Power-button off to quit from factory mode.