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

[nex91]

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

Thanks a lot for your help. I will change those fets and give you a feedback if it works. I have also tested the buffer with some youtube tutorial and it seems to be ok. I also changed some bad caps od the psu as shown on the pictures above, but i will change another too just for reliability as you said.

[nex91]

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

As i thought, allways complicated by me. I visited the best store in Vienna or in Austria for eletronic components and they have NONE of those fets...

Any suggestion where can i buy them?

[fatygant]

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

Any progress with your repair? I have exactly the same TV and it behaves like yours one. I would appreciate if you update us with the current state of that case...

Thanks!

[nex91]

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

Unfortunately not yet. I needed to order the parts from Hong Kong and i takes one month for me to get the package. But i will post the update as soon as the package come.
As they advised me to measure voltage and fets for shorts, you should also do that if u have the same problem.

[nex91]

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

Hi guys. Finally all the parts have arrived. But no luck...
So, nothing is clicking anymore but still no picture, black screen only. Shorted fets on ymain and all samwha wl and wb caps are changed. Whats next?

[dick_barton]

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

Then you have probably missed something. If the clicking has stopped that good. Check all the diodes and mosfets and see if you have missed one or two.
Also check and see if all the voltages are now correct.

[nex91]

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

So, i checked voltages and it seems all to be ok. But........While TV was powered on i was trying to check some fets and i made a short somewhere and i messed something up. Now the TV turns on for a second and automaticaly turns off again...

I am little confused so please explain me how i do the checks.
Should i desolder the components and check them or
Check them direct on the board in curcuit or
Check them with connected board to a power supply but on stand by or
Check them with TV power on (which i am sure is not a right answer)

By checking diodes,some of them were buzzing in one direction and some dont. Does that mean they were shorted?

Thanks to all that helping me

[dick_barton]

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

With the set powered off

Test diodes
https://www.youtube.com/watch?v=mMXDa5hVzXA

Test Mosfets
https://www.youtube.com/watch?v=oJqXq-TPF1c

[nex91]

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

Ok,now it seems to have now a problem with Xmain board(or with both X und Y) because when i remove it, the TV turns on normaly and stays on. And i touch Xmain board when i made a short so i think i made a problem on it. All voltages are ok i think the psu board is untouched.

As i saw on youtube link u gave me, diode needs to be desoldered before checking because sometimes gives wrong voltage or in both directions when in curcuit. True or false?

Any suggestions?

[dick_barton]

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

It is best to lift one end of the diode when testing because there could be a resistor or an inductor in parallel with it. It would then read low in both directions when soldered in place but not when one end is lifted from the board.