Service manual

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