Checking Inverter Board Circuit - HP VF15 Service Manual

12. Checking inverter board circuit

Check Vin pin is around 15.5V.
On/off pin is over 2V.
Brightness pin is between 0V and 3.7V.
NG
OK
Check pin 5 of I102 is 5V.
NG
OK
Check CN102, CN103 is connected
right.
NG
OK
Check pin 3 of I102 is over 2V.
NG
OK
Check pin 18 of I102 is triangle
pulse.
NG
OK
Check pin 4 of I102 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 I102 there is up to 2V
from output detection.
OK
NG
Check full-bridge (I101, I103, D102,
D103, C123) work right.
NG
OK
Check transformer (T101) work right.
NG
OK
Check detection (C124, C118, C126,
CR102, CR103 and like those) work
right and repair them.
vf15 / FP15 / f1523 / FP5315
It is not inverter problem.
Check Q101, D101, D104 and repair
them.
Check CCFL and repair them.
Check Q106, D110 and repair them.
Check C115, R108, I102 and repair
them.
Repair I102.
Check R120, D108, R116, CR101
and repair them.
Repair them.
Repair them.
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