Help with Samsung 50" Plasma

[wildduk]

I have a Samsung T5054/XAA. It is about 6 years old.
Last week I was watching it and the screen went blank, but you could still hear the audio.
After some searching, I decided to pull off the back and test the voltage on the SMPS. I pulled off the CN807-808-809-810 leads and tested the voltages of the Vs and Va terminals. The Va tested fine at 63 volts but the Vs showed 0 volts.

Should I assume that this board is bad, and either replace it or have it rebuilt? or is there something else I should test as well.

I did talk to a local repair shop and he said that if the Y Board wre to go, that it would cause the SMPS to shut down as well so as to not pump voltage in to the board?????

Not sure where to proceed with this.

Thx

[capkid]

Re: Help with Samsung 50" Plasma

A common failure in these sets is the Y-main (Y board) failing in concert with the upper Y-buffer. Check your buffer chips for pin holes. Also, I wouldn't completely rule out the power supply, so keep that in the back of your mind.

Here are a couple threads, but there may be others:

https://www.badcaps.net/forum/showth...ighlight=t5054

https://www.badcaps.net/forum/showth...ighlight=t5054

[wildduk]

Re: Help with Samsung 50" Plasma

Thx. Will do. Not arguing but what would cause the powers supply board to not show the right voltages if it was a Y board??

Thx

[capkid]

Re: Help with Samsung 50" Plasma

Some PSUs go into protection modes to minimize damage. This may have happened in your case, but I can't remember if these Samsungs do that. I believe so.

[wildduk]

Re: Help with Samsung 50" Plasma

Ok. Anyway to test the psu otherwise or does it take hooking up to a good y-main board to get the voltages back to where they should be. I'll take a look at the y-main and buffers when I get home.

[capkid]

Re: Help with Samsung 50" Plasma

You might be able to get the voltage to return if you disconnect the Y-main from the PSU.