Samsung PN64E533D2FXZA Plasma Sound But No Video

[Regor]

TV has been coming on without video for quite a while. But if you turned it off and then turned it right back on, it would come on with video. If after watching it for say an hour or more, if you turned it off, it would need to cool down for at least half an hour before you could get it come back on. Well, it finally quit coming on at all. Took the back off and nothing looked cooked. Took some voltage measurements as suggested by Samsung training video. All seemed well:
Standby=5.27V
PS On-3.3V
PS On drops form 3.3V - 0V when tv is turned on.
VS On rises from 0V - 3.3V when turned on.

Next step was to observe the green blinking LED on the Logic board. It blinks off once every 5 secs instead of normal state which would be once per sec. The video says then that there is a problem with Y-main, Y-buffer, or X-main boards.

Next step it says is to check Vs and Va voltage. Vs rises to 217 and immediately slowly falls. Va rises to 55 and immediately slowly falls. So this is where I'm at.

I shorted the PS on to gnd on the cable to the main and Va and Vs reacted the same. I guess that was just to eliminate Main board as problem.

I've searched all internet for a new Y-main and all are out of stock. None even on eBay. Am going to pull the Y-main and cool it down and retry to see if tv will come on. Any ideas on what to look for on the Y-main board or where to source a replacement board?

[Regor]

Re: Samsung PN64E533D2FXZA Plasma Sound But No Video

Here is a link to the video I was following:

https://www.youtube.com/watch?v=JjrwTZC5nVg

My Y-main number is BN96-24770A (LJ92-01906A).

[Regor]

Re: Samsung PN64E533D2FXZA Plasma Sound But No Video

OK. So I put the S-main board in the freezer for couple hours and re-installed it. Powered right up with video and everything is working fine. So I still have a problem in that I can't source a replacement board. Any ideas on what to replace on the board?

My Y-main number is BN96-24770A (LJ92-01906A).

[Jerryv]

Re: Samsung PN64E533D2FXZA Plasma Sound But No Video

Are any of the electrolytic capacitors bulging? Sort of shotgunning, but it wouldn't hurt to replace them.

Jerry

[Regor]

Re: Samsung PN64E533D2FXZA Plasma Sound But No Video

No, all look fine. Set continued to power up normally for a good while. 2 hours after re-installing after deep freeze, it's back to no picture. I cant see much on back of board either as banks are encased in some gray insulating material.

[ajshoe]

Re: Samsung PN64E533D2FXZA Plasma Sound But No Video

how about some pics of board - both sides

[DyerTM]

Re: Samsung PN64E533D2FXZA Plasma Sound But No Video

Hi Regor,

Did you ever find a solution to this issue? I have the exact same TV as you, I've got sound, but no picture. I've run through the same troubleshooting steps, the voltages are all spot on, but like you fall off immediately. Unfortunately everything is pointing to the Y-main; however, the only one I can find is on Ebay for $200... Not gonna happen at that price!

The one thing I'm curious about after reading everything I could find is whether or not it could actually be a faulty logic board considering the fact that it seems to control everything. I just hate to give up on this TV as it is in pristine condition and was an amazing piece of my home theater...

-Troy

[dick_barton]

Re: Samsung PN64E533D2FXZA Plasma Sound But No Video

Did the freezer work for you?

[martino]

Re: Samsung PN64E533D2FXZA Plasma Sound But No Video

Check the solder joints on the powersupply,Q802,Q804 are notorious for cracked solder joints. And check tho other ones too
Might be a shot in the dark,but I've repaired a few of these where that was the problem,resulting in the powersupply to self destruct.