Samsung PN51D430A3DXZA Sound but no picture

[Mberglo]

20 month old plasma with no picture. I've read several posts on here and learned a good deal so far, but need help with the next step.

I took the back off, but don't see any swollen or leaking caps. I measured VS and VA, and initially get VS=~205 and VA=~50 before both gradually decrease, maybe 10 volts per second.

I replaced the Y-Main board with ebay find, but same status. I unplugged every board leading to the power supply except main board and input board, since they appear to be required for power supply operation. VS and VA still fall the same way.

I guess I'm ready to buy a Power Supply, but wanted to check before I shotgunned again.

Picture attached. Y-Main is on the left side of your picture. Power Supply in the middle.

[tom66]

Re: Samsung PN51D430A3DXZA Sound but no picture

Have you done this test yet?
https://www.badcaps.net/forum/showpo...61&postcount=2

[Mberglo]

Re: Samsung PN51D430A3DXZA Sound but no picture

No, I haven't. What are the expected results of this test?

[tom66]

Re: Samsung PN51D430A3DXZA Sound but no picture

A series of test patterns show on the plasma panel.
http://www.youtube.com/watch?v=JCtF5...9BzGSA&index=2

[Mberglo]

Re: Samsung PN51D430A3DXZA Sound but no picture

and if it produces these test patterns, does that indicate I need a controller board?

[tom66]

Re: Samsung PN51D430A3DXZA Sound but no picture

It indicates a bad main board. The main board is the one with HDMI etc on it. Not the board you do the jumper on.

[Mberglo]

Re: Samsung PN51D430A3DXZA Sound but no picture

When the tv stopped working, I swapped it out for a Panasonic plasma. Then I could not get the DirecTV to complete it's initiation. It would get to "completed steps 1 of 2..." and that screen would go blank. I called DirecTV and they came out and diagnosed a bad HDMI cable.

So, could a bad main board destroy a cable?

I'll do the test this eve and post results.

[tom66]

Re: Samsung PN51D430A3DXZA Sound but no picture

A bad main board can't damage a cable, but it's possible that if there was a power surge, the directTV box and the TV were both damaged or wounded in some way. HDMI appears to be a particularly popular way for surges to propagate, and often results in fairly catastrophic damage.

[Mberglo]

Re: Samsung PN51D430A3DXZA Sound but no picture

shorting pins 3 & 4 fails. No test pattern, no changes whatsoever.

Another possible tip. When I plug it in, I get one click followed by a "bizzip" sound, possibly from the power supply area. I can't quite pinpoint the location.

Thanks in advance for your help.

[tom66]

Re: Samsung PN51D430A3DXZA Sound but no picture

Does the "bizzip" persist, or is it brief?

[Mberglo]

Re: Samsung PN51D430A3DXZA Sound but no picture

sound is very brief.

[tom66]

Re: Samsung PN51D430A3DXZA Sound but no picture

That's probably OK then.
Look at the LED indicator on the control board. Does it light up? If so, does it light up for 5 seconds then pause for 2, or does it flash about once a second?

[Mberglo]

Re: Samsung PN51D430A3DXZA Sound but no picture

That's probably OK then.
Look at the LED indicator on the control board. Does it light up? If so, does it light up for 5 seconds then pause for 2, or does it flash about once a second?

Tonight's homework. Noted. Thanks, professor.

[Mberglo]

Re: Samsung PN51D430A3DXZA Sound but no picture

5 seconds on, 2 seconds off.

[tom66]

Re: Samsung PN51D430A3DXZA Sound but no picture

OK, this indicates an X-main or Y-main fault. 5-2 blink error. I'd suggest you replace both boards as they are currently reasonably cheap.

[Mberglo]

Re: Samsung PN51D430A3DXZA Sound but no picture

Cool. Progress. I just replaced the Y-main. Do you recommend another Y-main at the same time as the X-main? Or can I likely just buy an X-main?

[tom66]

Re: Samsung PN51D430A3DXZA Sound but no picture

I always advise both Y-main and X-main to be replaced at the same time on these models.

[Mberglo]

Re: Samsung PN51D430A3DXZA Sound but no picture

Parts ordered. I'll report back. Thanks for the help.

[ntuner]

Re: Samsung PN51D430A3DXZA Sound but no picture

any updates on this ? same TV with no video but audio works

[ntuner]

Re: Samsung PN51D430A3DXZA Sound but no picture

any updates on this ? same TV with no video but audio works

did the self test 3+4 pin but same results. When the TV Is plugged in the screen looks like its trying to turn on with a brief light then its black. The light blinks 5 times then turns off. I did replace X-main with no results. Is this a Y-main or Y-buffer problem ? or even the control board