Samsung PS50C430A1W messy picture

[pdavid]

A friend's plamsa tv has ghostly greenish/redish picture and random black dots all over. The tv is 1.5 years old. The issue came up about 1 month after the warranty has expired...
A transparent, blurry pattern of the menu and previous channels remain on the screen when changing channels then fades after a while. We haven't taken it apart yet. Is there way to fix this or just give it to a samsung service place?

[tom66]

Re: Samsung PS50C430A1W messy picture

My bet would be Z-sustain. Repaired a similar fault with a PS42B450.

[pdavid]

Re: Samsung PS50C430A1W messy picture

Thanks Tom! Should I get a new board or is it fixable?

[tom66]

Re: Samsung PS50C430A1W messy picture

I got a used but working board for £15 so I just replaced mine.

[pdavid]

Re: Samsung PS50C430A1W messy picture

I guess it's worth a try then.

[tom66]

Re: Samsung PS50C430A1W messy picture

If it helps you find a part, the Z-sustain and X-main names mean the same thing. The Z-sustain is the board on the righthand side, looking from the back. The Y-sustain is the opposite board, it connects through buffers to the panel.

[pdavid]

Re: Samsung PS50C430A1W messy picture

We decided to fix the tv. Haven't managed to find a replacement X-main-z-sustain pcb yet. I removed the pcb to check it out. It had some cold solder joints at the legs of transistors but nothing looked damaged. Resoldered and put it back but nothnig has changed. Picture is still unwatchable.
The original x-main has the model number: 50V(F)2F LJ41-084557A

Once again, the problem is: The picture has blue, black and red jumping pixels, large transparent black spots. The screen is bright in the lower left corner.
I hope getting another x-main will fix it.

[tom66]

Re: Samsung PS50C430A1W messy picture

Is this your part? http://www.ebay.co.uk/itm/PS42C430-S...d#ht_633wt_891

I believe the 42" and 50" use the same X-main but I may be wrong.

[pdavid]

Re: Samsung PS50C430A1W messy picture

We have this one:
http://www.ebay.co.uk/itm/SAMSUNG-50...item35b9671c9b
plus the buffer

Those missing cap and transistor spaces looked so strange at first glance.

[pdavid]

Re: Samsung PS50C430A1W messy picture

Replacing the z sustain board made the picture clearer, more watchable but still with lots of red and purple dots all over. So we carefully adjusted a few trimmer-pots which sort of fixed it for now. I say it's good enough but friend decided to ditch the tv and swore to never buy Samsung again

[tom66]

Re: Samsung PS50C430A1W messy picture

Samsung plasmas suck, but I hope he at least sold it, not just threw it out.