Check C102 pin is
around 5V On/Off pin is
greater than 2V Brightness pin is an
external PWM.
It is not inverter board problem.
Check pin2 of I101 is 5V
OK
NG
Check R105 or C102 whether to be
damaged. And, printed wire between
them is opened.
NG
Check if P101, P102,
P103, and P104 are connected
correctly.
Check CCFL and repair them. Reconnect
P101, P102, P103, and P104 in tightly.
NG
OK
Check pin6 of I101 is
greater than 3.1V.
OK
Check R116, R115, R125, R126, C119,
R121, R122, C115, R117, R119, D107,
D108, D109 or D110 whether to be
damaged and repair them if any.
NG
Check pin13 of I101 is triangle pulse.
Check R107, R118, C104, i101 and repair
them.
OK
NG
Check pin12 of I101, there’s
soft start edge up to 4V and pin4, pin5
there’s some pulse output.
Repair I101.
NG
OK
Check pin5 of I101, there’s around
1.25V from output detection.
Check D114, D115, R130, D102, D103,
R111, D107, D108, D112, D113, R128 or
R120 and repair them if any.
OK
NG
Check SW MCS (Q104/Q105)
whether to work properly.
OK
Repair Q104, Q105
Check the prepherial components and repair
them
OK
NG
Appendix 4: Troubleshooting
Inverter circuit on the power board
2
ACER AL2002W
Go to cover page