AL1706 Service Guide
Page 21
Position Adjust picture phase to reduce horizontal line noise Adjust picture clock to reduce vertical line noise Adjust picture horizontal position 0-100 0-100 0-100 Do auto config Do Auto Config Do Auto Config 21 Outline b. Description for OSD Main Sub Menu Sub Menu Menu Icon Item Icon Contrast Description Contrast from digital register Adjustment Range 0-100 50 Reset Value Brightness Backlight Adjustment 0-100 100 Phase Clock H. ADJUSTING THE MONITOR 1.) Main OSD Menu a.
Position Adjust picture phase to reduce horizontal line noise Adjust picture clock to reduce vertical line noise Adjust picture horizontal position 0-100 0-100 0-100 Do auto config Do Auto Config Do Auto Config 21 Outline b. Description for OSD Main Sub Menu Sub Menu Menu Icon Item Icon Contrast Description Contrast from digital register Adjustment Range 0-100 50 Reset Value Brightness Backlight Adjustment 0-100 100 Phase Clock H. ADJUSTING THE MONITOR 1.) Main OSD Menu a.
AL1706 Service Guide
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2.3 Output power is unstable Unstable power Check sampling Circuit YES Check the R pin voltage of IC803 about 2.5V YES Check pin1 of IC802 voltage is 5.8V NO Check R810, R811,R818 NO Check the C pin voltage of IC803 if 3V YES Check R809, R808, R814, D809 NO Check D806, C815 if short NO Change R810, R811, R818 NO Change IC803 Change D806, C815 YES Check pin3 of IC802 voltage about 1V YES END NO Change R801, R805, R822, R823, R817 2.4 Backlight can't be turned on 33
2.3 Output power is unstable Unstable power Check sampling Circuit YES Check the R pin voltage of IC803 about 2.5V YES Check pin1 of IC802 voltage is 5.8V NO Check R810, R811,R818 NO Check the C pin voltage of IC803 if 3V YES Check R809, R808, R814, D809 NO Check D806, C815 if short NO Change R810, R811, R818 NO Change IC803 Change D806, C815 YES Check pin3 of IC802 voltage about 1V YES END NO Change R801, R805, R822, R823, R817 2.4 Backlight can't be turned on 33
AL1706 Service Guide
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No raster YES LED Green? NO T501, T502 fail YES U501, U502 fail IC501 fail END 34 YES Backlight can not be turned on YES Is there 12Vdc voltage on pin13 of restart? NO F501 open Check power supply YES Check I/F board R526 open ...
No raster YES LED Green? NO T501, T502 fail YES U501, U502 fail IC501 fail END 34 YES Backlight can not be turned on YES Is there 12Vdc voltage on pin13 of restart? NO F501 open Check power supply YES Check I/F board R526 open ...
AL1706 Service Guide
Page 35
3.Interface Board Troubleshooting 3.1 Black Screen and backlight turn on Black screen Check power NG supply:pin 1,2 of CN101 YES NG Check pin30,31,35,44 of U105(MCU) YES NG Check reset (pin 10) of U105 YES NG Check crystal(pin20,21) waveform of U105 YES Check CCFLEnable(pin3) of U105 NG MCU Fail YES YES Check pin5 of CN101 NG Power fail Check FB108,R131,R132, R133 Check C150,D102,R137 Check X101,C154,C155 Inverter Fail Check R105,R106,R157, C114,Q103 35
3.Interface Board Troubleshooting 3.1 Black Screen and backlight turn on Black screen Check power NG supply:pin 1,2 of CN101 YES NG Check pin30,31,35,44 of U105(MCU) YES NG Check reset (pin 10) of U105 YES NG Check crystal(pin20,21) waveform of U105 YES Check CCFLEnable(pin3) of U105 NG MCU Fail YES YES Check pin5 of CN101 NG Power fail Check FB108,R131,R132, R133 Check C150,D102,R137 Check X101,C154,C155 Inverter Fail Check R105,R106,R157, C114,Q103 35