anyone experienced with samsung plasma tvs ( picture fault )

[joey]

hi guys been working on 3 ps50c97hd samsung tvs.

all tvs had no picture due to blown top buffer and y-sus. i repaired all 3 ysus on all 3 tvs and tv now powers up by just trying lower buffers which were ok as only top had shorted.

however on all 3 tvs im getting a strange green dot type pattern?

this happens on all 3 tvs. on first thoughts im not convinced its still the ysus as all 3 are acting the same and all 3 tvs are using a different y-sus & bottom buffer. and were repaired by replacing the blown mosfets.

anyone have any ideas as its strange this is happening to all 3 tvs which the ysus was repaired.

i have checked vs.va. scan all all voltages correct.

http://www.youtube.com/watch?v=AKus6DnrorA

heres a video below showing problem. has anyone come cross this problem.

thanks

[Toasty]

Re: anyone experienced with samsung plasma tvs ( picture fault )

Video is post-repair?

What's it look like with both buffers connected?

[PowerAmpFreak]

Re: anyone experienced with samsung plasma tvs ( picture fault )

Not much of help, but I had exactly the same issue on a PS50Q96HD a couple of days ago, top chip blown on upper buffer, mosfet bank shorted on Y-SUS.
Lower buffer didn't show a sign of damage, but it's not sure.
In your case, upper buffer short may have damaged the lower buffer. I hate such failures, may it be the same case as when Samsung used the bad silicone which after short time made the buffer blow due to poor isolation. Oh god.

[rayrod81]

Re: anyone experienced with samsung plasma tvs ( picture fault )

Yeah it looks like the bottom buffer is bad as well. I have seen this fault even when the board is not shorted.