Acer AL1716 Service Manual page 36

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
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Power fail
Check
FB108,R131,R132,
R133
Check
C150,D102,R137
Check
X101,C154,C155
YES
Inverter Fail
Check
R105,R106,R157,
C114,Q103