Samsung Plasma PS43E470 Fault with dark bruise image

[longnguyen]

Hi everyone!

My TV Samsung Plasma got problem with fault: Have sound but no picture and I try to fix it.
After replace Y-SUS board and fixed X-buffer board, it works now.

However, the image have some darkness and sparkle fixed parts.

I have try to adjust Vs, Va and Vsc and I noticed If I increase Vs, the dark part reduce but It comes to limited voltage values and it is so higher than to standard by Factory Recommend (Vs now 219v rather ~205v)

I actually not know which parts I need to take care now, so I need some help from someone?
This is some pictures of its
https://imgur.com/KjE3xg6
https://imgur.com/tPFTQ5d

[chrismurphy]

Re: Samsung Plasma PS43E470 Fault with dark bruise image

I suspect you have an issue with the Zsus

[longnguyen]

Re: Samsung Plasma PS43E470 Fault with dark bruise image

I suspect you have an issue with the Zsus

You mean my X-buffer board has problem?

[chrismurphy]

Re: Samsung Plasma PS43E470 Fault with dark bruise image

yes or very bad panel

[longnguyen]

Re: Samsung Plasma PS43E470 Fault with dark bruise image

I have already change 4 IGBTs on this board, an driver buffer for there couple IGBTs, and Hope my replacement work well. But the result is not perfect. I suspect that my IGBTs are not good because when I checked them by my DMM in Resistor Mode they discharged differently. Do you think it is the cause?

[longnguyen]

Re: Samsung Plasma PS43E470 Fault with dark bruise image

Finally, after purchase a X board from Samsung Service Center. My TV has work fine now.

I post this result to share with all of you in case you fall into the same situation like me.