Acer Acer –LCD-B223W

21

3.Black screen
U104 FAIL
Black screen
Ch ec k pi n 5,6 o f
CN101
Check CCFL-
Enable,Brightness(pin
109,125)
of U104
Check crystal (pin
127,128) waveform of
U105
Chec k res et (pin1 0 8)
of U104
Check power supply
for U1 04
Check power
supply:pin 1,2 of
CN101
Check R111,Q106,
R112,R147,R148
Inverter Fa il
Check
X101,C150,C152
Check C 151,R 165
Check
FB102,FB103,
Pow er fail
NG
NG
NG
NG
NG
NG
OK
OK
OK
OK
OKOK