Samsung PN43E450A1F 450 series no video

[klierslc]

Hi folks!

First off, I am a super noob--sorry in advance for the dumb questions.
Second--I have been searching around for the last couple hours and found that this is an excellent site and that I am a bit over my head.

So, The TV in question is the 450 series samsung from 2012 or so. The sound works fine but there is no video at all. I have a green blinking light on the logic board which I *think* means the main board is ok. X/Y main on the left side has a blown little blue thing which I think is a small capacitor--see pic below. When I measure Vs to ground at the logic board, I get ~3v--I am not sure where else to measure Vs as I don't see an obvious spot that is marked.

So, the question is that with an obvious blown blue thingy, would it be prudent to just replace the blue thingy, or might that be a symptom of a different issue and not the actual cause? I'd like to avoid soldering in a new capacitor (if that is what it is) and having it blow again due to an underlying issue.

I am reasonably competent with a multimeter, but am also a bit of a cretin--please be gentle! Any thoughts?

Thanks!

Dan

[klierslc]

Re: Samsung PN43E450A1F 450 series no video

Bump... any ideas?

Thanks!

[Alastair E]

Re: Samsung PN43E450A1F 450 series no video

Disc ceramic cap gone short would have killed a load of IGBT's on that board I guess--You'll need to check 'em with ohmmeter/DVM...

[ReeceyBurger123]

Re: Samsung PN43E450A1F 450 series no video

As your a noob, I suggest you replace both Y and Xmain make your life 10 times easier

[klierslc]

Re: Samsung PN43E450A1F 450 series no video

Disc ceramic cap gone short would have killed a load of IGBT's on that board I guess--You'll need to check 'em with ohmmeter/DVM...

I replaced the cap--no change in symptoms. I'll search around to see how to test the the IGBTs. Of note, I found a couple spots to check Vs--pin 8 at the top of the X/Y main has ~16 volts, pin 7 has ~14. Not sure if that means anything, but I read somewhere that the Vs up there should be in the 200v neighborhood.

Thanks for the help!

Dan

[klierslc]

Re: Samsung PN43E450A1F 450 series no video

As your a noob, I suggest you replace both Y and Xmain make your life 10 times easier

I am seriously considering it. What has held me back so far is that I might be missing an underlying cause and end up cooking the new boards as well. I don't have any issue replacing the boards, I'd just like to ensure that I am fixing the right thing instead of throwing parts at it.

That said, will replacing the Y and X main address any issues that would have caused this? Also, I *think* this display has a combined X/Y board--left side hooked to the buffer. If this is not the case, which one is the Y?

Thanks!

Dan

[ReeceyBurger123]

Re: Samsung PN43E450A1F 450 series no video

Vs shuts down if it detects an issue like a short circuit so thats probably why.

[klierslc]

Re: Samsung PN43E450A1F 450 series no video

Ok, so I have another X/Y board on the way--anything I can/should check before installing the new board to ensure I don't fry it?

Thanks!

Dan

[klierslc]

Re: Samsung PN43E450A1F 450 series no video

Just to close the loop on this, the new board came in and the display is working perfectly. I still don't know what the actual cause was or what was wrong with the old board though. Thanks for the help!
Cheers,

Dan