Philips 20PF4121/58 power inverter board problem

[JohnNovak]

Re: Philips 20PF4121/58 power inverter board problem

Hi.

I check this critical parts and also other diodes and transistors,
Q208, Q204, D201, D202, Q209, Q205, D101, D103, D100,
no faults found.

Thank you.

[bobbyskillz]

Re: Philips 20PF4121/58 power inverter board problem

What's going on with Q208 where it meets the heatsink? Have you checked the diodes and MOSFETs out of circuit?

[JohnNovak]

Re: Philips 20PF4121/58 power inverter board problem

I check all resistors, standard and not standard values are OK.

Any suggestion?

[JohnNovak]

Re: Philips 20PF4121/58 power inverter board problem

Some pictures for better view.

[JohnNovak]

Hi.

I have LCD TV Philips with power inverter board problem.

TV Philips model: 20PF4121/58, chasiss LC4.1E AB

power inverter board model: DELTA DAC-12M019 AOF, REV.05

After electrical shock by storm is dead.

No any visible damage or short circuit found.

I replace some sensitive parts on board,
U101=EA1523A, Q107=11N80C3, optocoupler U100=PC817.

No power up.

Can not found schematic for this power inverter board to check carefully small smd resistors which many are not standard values and is very hard to check if resistance is correct.

Any help, experience with this power inverter board?

Thank you.