Philips 42PFP5332/10 Screen Flickering Problem how to repair?

[nex91]

Hello everyone, i have a problem with my screen flickering and some freaky noise behind on the left board. I will attach 2 videos and u can see what i mean.
Can someone help me please?
Thanks in advance!

Screen problem video
Freaky noise video

[ReeceyBurger123]

Re: Philips 42PFP5332/10 Screen Flickering Problem how to repair?

Come on here, you've not helped us much the videos are private, you've not tested/listed any voltages. Ive done this set same fault, Samsung Ymain common issue two fets short on the big heatsink. Even after the Ymain repair you NEED to recap the Samwha Wb, Wl and Samxon Gf and Gl brand capacitors on the Psu if you dont mares well not bother with it as they have a high failure on these sets rendering the set dead.

[nex91]

Re: Philips 42PFP5332/10 Screen Flickering Problem how to repair?

Oh sorry, can u see the videos now?

[dick_barton]

Re: Philips 42PFP5332/10 Screen Flickering Problem how to repair?

Sounds like the power supply switching on and off. A good dust off of the circuit boards and carefully checking all the solder joints would be a good starting point.

[nex91]

Re: Philips 42PFP5332/10 Screen Flickering Problem how to repair?

You mean only on this board that i made a video of it or all boards? Do i need some tools or should i check with eyes only? Sorry for stupid questions but i am a noob
Thanks for your patience.

[dick_barton]

Re: Philips 42PFP5332/10 Screen Flickering Problem how to repair?

Start with the power supply board. But all the boards could do with a dusting.

There's a label on the panel giving the voltages for Va, Vs, Ve etc. Can you measure these voltages while it is attempting to switch on.

[ReeceyBurger123]

Re: Philips 42PFP5332/10 Screen Flickering Problem how to repair?

Then test Vsc on the Ymain, thats my bet.

[nex91]

Re: Philips 42PFP5332/10 Screen Flickering Problem how to repair?

Hi guys, i measured finally voltages and changed some bad caps and diods on a psb. I think now is psb ok only a y-main board is a problem. Here are the results and i hope u will tell me what to do next. Thanks! Cheers!

[ReeceyBurger123]

Re: Philips 42PFP5332/10 Screen Flickering Problem how to repair?

Have you tested for shorted fets on the Ymain buddy ?

[nex91]

Re: Philips 42PFP5332/10 Screen Flickering Problem how to repair?

No mate, i dont know how to do it exactly.

[nex91]

Re: Philips 42PFP5332/10 Screen Flickering Problem how to repair?

Can someone tell me what should i check and how? Desoldering every little part of the board and checking it or in circuit ? Where should i start? Thanks

[ReeceyBurger123]

Re: Philips 42PFP5332/10 Screen Flickering Problem how to repair?

Got a Dmm ?

[nex91]

Re: Philips 42PFP5332/10 Screen Flickering Problem how to repair?

Yep i have a digital multi meter

[Moreno83]

Re: Philips 42PFP5332/10 Screen Flickering Problem how to repair?

Multimeter in diode/continuity mode and measure the outer pins on every fet. ( Or black prope on middel pin and red on outer pins ).

[nex91]

Re: Philips 42PFP5332/10 Screen Flickering Problem how to repair?

What means "fet"?

[ReeceyBurger123]

Re: Philips 42PFP5332/10 Screen Flickering Problem how to repair?

Use google and bcn to find out.

[nex91]

Re: Philips 42PFP5332/10 Screen Flickering Problem how to repair?

Ok guys i measured all fets on the ymain board and found 3 of them on the biggest heatsink shorted (black prope on middel pin and red on outer pins and i hear a BIIIIIPPP). The board is disconnected from the tv and i measured them without disoldering. Is that ok?
I also had one with 7 pins instead of 3 and i measured it so: black prope on the 4th pin and red on every other. Correct?

[ReeceyBurger123]

Re: Philips 42PFP5332/10 Screen Flickering Problem how to repair?

Aye the exact same ones Ive had blow, its normally the two smaller ones next to the bigger one highlighted in red that failed. Part number is something weird like GP70N33 or something cant remember as not done one of them for a while.

[ReeceyBurger123]

Re: Philips 42PFP5332/10 Screen Flickering Problem how to repair?

The good thing is, the fuse isnt gone which means that the fets have not damaged the driver circuit meaning that it has not reached the output meaning that the buffer is fine and the other major transistors will be ok. If the fuse goes theres alot more damage. Though they are a bugger to replace due to the heatsinks being so tight other than that these boards are rock solid and I would advise you fix it.

[ReeceyBurger123]

Re: Philips 42PFP5332/10 Screen Flickering Problem how to repair?

Also Ive got two of these 42Pf5532D sets in now both clicking, badcaps on the psu. Replace all Samwha Wl and Wb series caps on the psu with good brand new caps for best reliability.