samsung ps51d7000 restart problem

[dj01fad]

hello.
I have a samsung ps51d7000 that when I pug in it starts, displays logo and then displays the imput label (hdmi 4 in my case), and after 2-3 seconds it restarts. It doesn't respond to the touch keyboard or to the remote (the led is flashing when I touch the keyboard but does not respond to source, volume or pw off). can it be the nand flash? i'll try to put some signal on hdmi4 to see if it will produce an image or sound.

[freakaftr8]

Re: samsung ps51d7000 restart problem

Heat up the ICs that have the labels on them on the board. Try heating up the board with a hairdryer. If that does not work, could be the typical C102 10v 47uf problem.

[dj01fad]

Re: samsung ps51d7000 restart problem

Heat up the ICs that have the labels on them on the board. Try heating up the board with a hairdryer. If that does not work, could be the typical C102 10v 47uf problem.

I don't know about that typical problem. Can you tell me more? Should I replace tat C102 first?

Thanks.

[tom66]

Re: samsung ps51d7000 restart problem

Basically the ICs on this set can fail, heating them up can briefly allow them to work which can assist in the diagnosis.
Not sure about the typical problem, Freak might be referring to the A550's problem with a tantalum capacitor, I don't think it affects your set.

[dj01fad]

Re: samsung ps51d7000 restart problem

OK then, I'll heat the board as soon as I get home.
Someone from a samsung repair shop told me it's about the NAND flash. BUT, he told me that if only the logo appears and then restarts it's a NAND problem; on my set appears the logo, and the source box and after 3 seconds it restarts...

[tom66]

Re: samsung ps51d7000 restart problem

It could still be a NAND issue

[dj01fad]

Re: samsung ps51d7000 restart problem

I have no changes when heating. I guess it remains the NAND.
I found another thread here:
https://www.badcaps.net/forum/showthread.php?p=659071
now I'll try to freeze it to see how things will go.

[Nick's Tvs]

Re: samsung ps51d7000 restart problem

This board commonly fails due to nand problems. You most definitely have a bad nand.
There unfortunately are no more boards available for this model online. If you have the solder skills to replace the Nand itself, there are some people that sell them on eBay but they don't offer much of a warranty on those.
If you do not have the soldering skills to replace those, there are services available such as the one linked below:

https://www.ebay.com/itm/Samsung-Mai...0AAOSwol5Y0aoj

Good luck.

[dj01fad]

Re: samsung ps51d7000 restart problem

I have the skills and the tools, but I don't have the chip and a programmer. I found someone here in Romania that can send me a new programmed chip for 20-25 euros and I think I'll go for it.

[Nick's Tvs]

Re: samsung ps51d7000 restart problem

The chips for sale on eBay are preprogrammed and ready to go.