Samsung PN51D530A3FXZA Plasma Blank Screen W/Sound

[crt man]

Re: Samsung PN51D530A3FXZA Plasma Blank Screen W/Sound

I bought a used y main x main and y buffer off of ebay. Hopefully, this fixes the issue. I will post when they arrive on monday.

Hi,

You still may need,a logic board also.

Alan.

[capkid]

Re: Samsung PN51D530A3FXZA Plasma Blank Screen W/Sound

What confuses me, is why they would not put fuses into the y-main like I've seen on the older plasma/lcd's. It seems they have tried to cut costs on many different levels. My current plasma is only 1.5 years old and was very well taken care of. I've never done a tv repair before and the headache is definitely worth it to my bank account.

Yeah, it was puzzling to me that these boards aren't better protected from each other. It's definitely fun and satisfying to see these work after they've been repaired. I wanted a plasma badly a long time ago, but I could never bring myself to spend several thousand dollars on one. That's when I got hooked on repairing TVs. The most I've ever spent on a flat TV is $200, and the repair was only $5

[metaljo2003]

Re: Samsung PN51D530A3FXZA Plasma Blank Screen W/Sound

What confuses me, is why they would not put fuses into the y-main like I've seen on the older plasma/lcd's. It seems they have tried to cut costs on many different levels. My current plasma is only 1.5 years old and was very well taken care of. I've never done a tv repair before and the headache is definitely worth it to my bank account.

[capkid]

Re: Samsung PN51D530A3FXZA Plasma Blank Screen W/Sound

These thin Samsungs are a pain, which is why I always tell people to test quickly and "get out", as you could end up blowing something else. I like to remove the boards from the TV and test that way to be safe. Usually a few failed transistors can easily be identified, then you just replace the whole board. Component-level repair is not a good idea on these thin Samsungs.

[metaljo2003]

Re: Samsung PN51D530A3FXZA Plasma Blank Screen W/Sound

Good point. I have learned a valuable lesson with tv's. Other electronics are simple!

[capkid]

Re: Samsung PN51D530A3FXZA Plasma Blank Screen W/Sound

Yep, this sounds like what I mentioned above. Your mains are most likely killing each other when you replace them one at a time, and you need to break the infinite loop. When your new boards arrive, I'd do some checks with the boards out of the TV before installing them, then I'd install EVERYTHING AT ONCE and turn on the TV. It should work fine.

[metaljo2003]

Re: Samsung PN51D530A3FXZA Plasma Blank Screen W/Sound

i found 5 bad components on one of my x main boards - the original. The other board had 3 shorted FETs. I bought a used y main x main and y buffer off of ebay. Hopefully, this fixes the issue. I will post when they arrive on monday.

[metaljo2003]

Re: Samsung PN51D530A3FXZA Plasma Blank Screen W/Sound

I looked at the y main and only found one iffy (after testing correctly). It was RFX10TF6S transistor. The drain pin is not in the circuit yet all three pins show a short. I attached a picture of the component.

[crt man]

Re: Samsung PN51D530A3FXZA Plasma Blank Screen W/Sound

Hi

You say you replaced the board, compare the readings
on both sets of FET's and see if one of them is a good board.

Alan.

[crt man]

Re: Samsung PN51D530A3FXZA Plasma Blank Screen W/Sound

Hi

Yes you can test them still in the board, if there is low
resistance on all combinations of test then these will be bad

1-2 1-3 2-3

I had two fail on the X main but none on the Y main
if you have had most of them fail then you are unlucky.
Alan.

[metaljo2003]

Re: Samsung PN51D530A3FXZA Plasma Blank Screen W/Sound

Should I test these in circuit? I am noticing that most of the FETs on the y main are showing low resistance across the gate and the source (should be the outer legs I believe). There is only 2 of them with low resistance on the x main.

[crt man]

Re: Samsung PN51D530A3FXZA Plasma Blank Screen W/Sound

Tom

Yes I mean Y buffer that's me not checking my post first.

[tom66]

Re: Samsung PN51D530A3FXZA Plasma Blank Screen W/Sound

X buffer? Do you mean Y buffer?

[crt man]

Re: Samsung PN51D530A3FXZA Plasma Blank Screen W/Sound

Hi,

As you look at the FET put one probe on one outer leg and the other on the other outer leg, and read resistance they should be high if you reverse this then it still should be high.

If they read low resistance any way around then you have a short one.

On my board I had two short FET's caused by faulty Y buffer.

HTH

Alan

[tom66]

Re: Samsung PN51D530A3FXZA Plasma Blank Screen W/Sound

Just test all combinations 1-2 2-3 and 1-3 of each device, using the diode test mode.

[metaljo2003]

Re: Samsung PN51D530A3FXZA Plasma Blank Screen W/Sound

So I am testing the FETs on the x main. Do I put the black lead on the source and red lead on the gate before I swap to the drain to test output? or is it in reverse? If it's not in reverse, I believe I found one bad FET 30G124.

[crt man]

Re: Samsung PN51D530A3FXZA Plasma Blank Screen W/Sound

Which had to replace the logic board?

Yes sorry

Alan

[metaljo2003]

Re: Samsung PN51D530A3FXZA Plasma Blank Screen W/Sound

That was the same as mine, I had to replace it.

You will need a multimeter and check for shorts,
on the FET 's

Alan.

Which had to replace the logic board?

[crt man]

Re: Samsung PN51D530A3FXZA Plasma Blank Screen W/Sound

There is a LED on the logic board that lights up at once per second when the ribbon cable from the y main and logic board is disconnected and the power cable from the y main to the x main is disconnected. When it's all connected normally, it flashes roughly every 5 seconds.How can I go about testing the FET's?

That was the same as mine, I had to replace it.

You will need a multimeter and check for shorts,
on the FET 's

Alan.

[metaljo2003]

Re: Samsung PN51D530A3FXZA Plasma Blank Screen W/Sound

Hi.
When I disconnected the ribbon to the X main, I killed the Logic board
causing the relay to click four times. See if you have a led on the logic board
and if you have it should flash about once a second anything other you will have probably killed it .

In general what I found was the Y buffer shorted taking out two FET'S the X main replacing these restored the TV back to normal order.

HTH.

Alan.

There is a LED on the logic board that lights up at once per second when the ribbon cable from the y main and logic board is disconnected and the power cable from the y main to the x main is disconnected. When it's all connected normally, it flashes roughly every 5 seconds.

How can I go about testing the FET's?