Interface Board Troubleshooting; Black Screen And Backlight Turn On - Acer AL1706 Service Manual

3.Interface Board Troubleshooting

3.1 Black Screen and backlight turn on

Black screen
Check power
supply:pin 1,2 of
CN101
YES
Check pin30,31,35,44
of U105(MCU)
YES
Check reset (pin 10)
of U105
YES
Check crystal(pin20,21)
waveform of U105
YES
Check CCFL-
Enable(pin3)
of U105
NG
MCU Fail
NG
NG
NG
NG
YES
Check pin5 of
CN101
NG
35
Power fail
Check
FB108,R131,R132,
R133
Check
C150,D102,R137
Check
X101,C154,C155
YES
Inverter Fail
Check
R105,R106,R157,
C114,Q103