Service manual

4.2 Inverter circuit on power board
Check C106 pin is
greater than 0.55V Brightness pin is
an external PW M.
It is not inverter board problem.
Check pin2 of I101 is 5V
OK
NG
Check R105, ZD101, or C102 whether to
be damaged. And, printed wire between
them is opened.
NG
Check if
P103 and P104 are connected
correctly.
Check CCFL and repair them. Reconnect
P103 and P104 in tightly.
NG
OK
OK
Check pin5 of I101, there’s around
1.25V from output detection.
Check D121, D120, R130, C128, C111
and repair them if be dam aged.
NG
Check SW MCS Q105 whether to
work properly.
OK
Repair Q105
Check the prepherial components and repair
them
OK
NG
4. Troubleshooting (continued)
15
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ACER AL1716W