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Acer Acer –LCD-B223W
21
3.Black screen
U104 FAIL
Black screen
Check pin5,6 of
CN101
Check CCFL-
Enable,Brightness(pin
109,125)
of U104
Check crystal (pin
127,128) waveform of
U105
Check reset (pin108)
of U104
Check power supply
for U104
Check power
supply:pin 1,2 of
CN101
Check R111,Q106,
R112,R147,R148
Inverter Fail
Check
X101,C150,C152
Check C151,R165
Check
FB102,FB103,
Power fail
NG
NG
NG
NG
NG
NG
OK
OK
OK
OK
OKOK