Acer AL1702 Manuale di servizio - Pagina 25
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11. Checking inverter board circuit
Check C101 pin is around .
On/off pin of P802 is over 2V.
Brightness pin is between 0V and 3.5V.
NG
OK
Check pin 5 of I101 is 5V.
NG
OK
Check CN102, CN103 is connected
right.
NG
OK
Check pin 3 of I101 is over 2V.
NG
OK
Check pin 18 of I101 is triangle
pulse.
NG
OK
Check pin 4 of I101 there is soft start
edge up to 4V and pin 11, 12, 19, 20
there is some pulse output.
NG
OK
Check pin 2 of I101 there is below
2V from output detection.
NG
OK
Check full-bridge (I102, I103, D102,
D103, C123) work right.
NG
OK
Check transformer (T101) work right.
and repair it.
It is not inverter problem.
Check Q106, Q102 and repair them.
Check CCFL and repair them.
Check R128 and repair it.
Check C115, R108, I101 and repair
them.
Repair I101.
Check C128/C129/C132/D115/
D114/C118 and repair them.
Repair them.
AL1702
Page 23