SAMSUNG PS-50Q96HD No picture

[Andyd1970]

Hi Guys,

My nan and granddad have a SAMSUNG PS-50Q96HD TV that has sound and no picture, it was working fine and the picture just went one day. I am getting pretty good with LCD TV repairs but no so good with plasma's.

Anyone have any advice please?

Andy

[tom66]

Re: SAMSUNG PS-50Q96HD No picture

y-buffer + y-main 90% of the time.
cold joints on power board the other 10%.

[Andyd1970]

Re: SAMSUNG PS-50Q96HD No picture

Hi Tom,

When you say cold joints on power board is there a certain area on the board or can it be anywhere? as I think its worth a try to resolder the joints first. I will open it up today and send a pic as just need to understand which PCB is y-buffer and y- main.

Andy

[tom66]

Re: SAMSUNG PS-50Q96HD No picture

Mainly around the heatsinks with the large power transistors. They are very obvious on inspection - grey/dull/cracked.

[Andyd1970]

Re: SAMSUNG PS-50Q96HD No picture

Hi Tom, Just checked PSU and all the solder joints look good, See picture attached. Can you tell me where the y-buffer and y-main are so I can get a part number from them please.

Andy

[Andyd1970]

Re: SAMSUNG PS-50Q96HD No picture

OPS! See attached picture

[martino]

Re: SAMSUNG PS-50Q96HD No picture

The long narrow boards on the left side with the 6 brown ribbons are your Y-buffer boards...The Y-sus board is right next to it(attached to the buffer boards).

[wreksta]

Re: SAMSUNG PS-50Q96HD No picture

and your xmain is to the rght mate

before you start replacing parts test them measure fuses etc
measure al connections ratings are on power board

measure the vs and va these test points are on the power board
check against panel sticker on the plasma

[Andyd1970]

Re: SAMSUNG PS-50Q96HD No picture

Hi Guys,

I am a little confused now as Tom66 said it is going to be the y-buffer and y-main. So I was just going to replace them, so do I need to check voltages/fuses if that the case?

Andy

[wreksta]

Re: SAMSUNG PS-50Q96HD No picture

Hi andy check the fuses on y main thats the left board fuse is at top near the vs connector

also there is a small cap near this connector just under the heatsink check the top of it or any caps for bulging tops

[Andyd1970]

Re: SAMSUNG PS-50Q96HD No picture

Hi Guys, Never got anywhere with this set as my grandparents bought a new one and just found out that it has been in the garage ever since! so got it out and going to try to fix it and use it I checked what wreksta suggested the fuse is OK and I cannot see any bulging caps at all. Is there a way to prove it is the Y buffer or y main?

[tw2005]

Re: SAMSUNG PS-50Q96HD No picture

ymain, On one of the heatsinks there is a group of 4 (or 5) 88N30W & a 2SK2837 and a surface mounted B20NK50Z in front of that heatsink. Generally any of these will be shorted and the upper y buffer board.

If the Ymain is shorted, 100% buffer will be too. could try searching the board numbers or other models with the same boards. Plenty of posts about this panel bad upper/ymain.

[Andyd1970]

Re: SAMSUNG PS-50Q96HD No picture

Hi Tw2005, I have just measured the devices, I have four 88N30W and one K2837. I have recorded the readings as you look at the side of the PCB with the fuse/Vs input to the left:

1, 88N30W... left pin to middle pin 40.9, middle to right pin 0.4, outer pins 40.9
2, 88N30W... left pin to middle pin 40.8, middle to right pin 0.3, outer pins 40.8
3, 88N30W... left pin to middle pin 40.7, middle to right pin 0.3, outer pins 40.7
4, 88N30W... left pin to middle pin 11.3, middle to right pin 0.3, outer pins 11.2
5, 2SK2837...left pin to middle pin 700K, middle to right pin 5.1M, outer pins 9.96K
6, B20NK50Z....across the two pins 0.998K

Does indicate that the 4th 88N30W is S/C?

[tw2005]

Re: SAMSUNG PS-50Q96HD No picture

You could take the punt and remove that first and recheck the others. 1 shorted will short the whole bank as you can see middle to right are all short.

The worst part about these is sourcing an upper buffer board unless you can do hot air work on the buffer ICs.

[tw2005]

Re: SAMSUNG PS-50Q96HD No picture

Tom has a video on testing this style of buffer board.

[tw2005]

Re: SAMSUNG PS-50Q96HD No picture

info

[Andyd1970]

Re: SAMSUNG PS-50Q96HD No picture

Fantastic the guide is just what I needed, thank you so much

[smiddy1980]

Re: SAMSUNG PS-50Q96HD No picture

He guys I just read the PDF and I am getting -89 is that correct or am I reading it wrong, or have I installed the ysus repair kit wrong ?, I am getting a fuzzy screen now :-(

[tw2005]

Re: SAMSUNG PS-50Q96HD No picture

He guys I just read the PDF and I am getting -89 is that correct or am I reading it wrong, or have I installed the ysus repair kit wrong ?, I am getting a fuzzy screen now :-(

Did you mean to put this here or should it be on your thread?

[smiddy1980]

Re: SAMSUNG PS-50Q96HD No picture

Yeah sorry was meant for mine, thanks I did just notice that, thanks again