Acer P221W Service Manual page 24

Acer
4. Black screen
Black screen
Check power
supply:pin 1,2 of
CN102
YES
Check power supply
for U102
YES
Check reset (pin4) of
U102
YES
Check crystal (pin 15,16)
waveform of U102
YES
Check CCFL-
Enable(pin46)
of U102
NG
U102 FAIL
NG
NG
NG
NG
YES
Check pin4 of
CN102
NG
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Service Manual
Power fail
Check
D101,D105,Q104
Check C105,R113
Check
X101,C108,C109
YES
Inverter Fail
Check R123