Philips 42FD9944 powersupply failure

[PowerAmpFreak]

Hello everyone,

Got a struggling older Philips plasma, model 42FD9944.
During poweron it crackles and pops from the SMPS, I can read a somewhat unstable PFC voltage of around 390VDC, jumps a few volts up and down.
VA and VS does not start anymore, recently tried to start up those, but not reach their correct magnitudes.

Suspect a bad caps SOMEWHERE, there are hundreds in this set.

Please check the attached pic and let me know if you know what to check.

[PowerAmpFreak]

Re: Philips 42FD9944 powersupply failure

Any advice?
Have to go through the pcb with freeze spray. Hairdryer didn't reveal anything.

[freakaftr8]

Re: Philips 42FD9944 powersupply failure

Crackle and popping is not a good sign, where in the SMPS is that coming from? Primary or secondary side?

[PowerAmpFreak]

Re: Philips 42FD9944 powersupply failure

It's hard to determine which side crackles. I suspect the crackles are, simply, the PFC trying to regulate but the DC/DC is jumpy and won't present a smooth load.