Samsung PN43D450A2D board swap

[TheSniper]

All,
in regards to a Samsung PN43D450A2D with an unknown dead board or several boards. has the relay click of death and no pic.

I was lucky enough to come across the same Set with a cracked screen.
so a complete set of known good boards.

My question is. Is it safe to swap out boards between the sets. basically identifying the bad board. this way I can hang onto the other boards for future safe keeping? what if any would be the safest way to accomplish this.

Thanks in advance.
TheSniper

[tw2005]

Re: Samsung PN43D450A2D board swap

Depends on the fault symptom originally, clicks on , then off, or clicks on with startup sound, audio?

The safe boards to swap first would be the main, control logic and PSU.

The tricky ones are the sustains and buffers.

Shorted buffers,Ymain and Xmain have the potential to take each other out.

You may have a shorted Xmain, you could pull it out and see if there are any shorted components like the transistors.

I'd be tempted to swap the y,x and buffers at once other wise you may have a bad X and kill the y or bad y and kill the X or shorted buffers and kill the y and the y kills the x?

I think xmain could be a common fail since SJ sells Xmain rebuild kits. The 2010 model I fixed apparaently has a known firmware issue killing the X and needed that upgraded too.

Once the X killed the Y for sure when I tried to fault find it, I read most recommend doing the lot so that's waht I did rather than chase my tail and i have seen people do that trying to replace one board just to have it short again.

[tw2005]

Re: Samsung PN43D450A2D board swap

Oh and SJ have 0 xmains, over 800 Ymains, nearly 1000 psu boards, 600 mains, 800 y buffers.

That tells a story in itself that xmain is most likely failed.

So looks like Xmain, mainboard, Ybuffer/ymain, CTRL board, PSU in order of failure rate .

[TheSniper]

Re: Samsung PN43D450A2D board swap

Depends on the fault symptom originally, clicks on , then off, or clicks on with startup sound, audio?

The safe boards to swap first would be the main, control logic and PSU.

The tricky ones are the sustains and buffers.

Shorted buffers,Ymain and Xmain have the potential to take each other out.

You may have a shorted Xmain, you could pull it out and see if there are any shorted components like the transistors.

I'd be tempted to swap the y,x and buffers at once other wise you may have a bad X and kill the y or bad y and kill the X or shorted buffers and kill the y and the y kills the x?

I think xmain could be a common fail since SJ sells Xmain rebuild kits. The 2010 model I fixed apparaently has a known firmware issue killing the X and needed that upgraded too.

Once the X killed the Y for sure when I tried to fault find it, I read most recommend doing the lot so that's waht I did rather than chase my tail and i have seen people do that trying to replace one board just to have it short again.

If I leave everything connected . I get lots of random clicks from the smps board lower relay. No music. However If I disconnect the power leads going to the XMains, same results but If I disconnect the Ymain. I get music.

Also If I disconnect the Main board. Same results no music. But If I disconnect the Logic board I get music.

All this with no Picture.
The.Sniper