Samsung plasma tv PS43D450A2 pixel issues

[Phlox321]

Hi guys. I have a Samsung plasma Tv with a wierd prpblem.its a samsung plasma PS43D450A2. A little history : I got the tv free from someone as the thought the power supply was bad and was about to throw it away. I check it and found shorted x main board. I found the diodes and igbts were shorted. After a long search for components i aquired them and replaced them. The tv then worked fine for a few months and about 2 weeks ago it started showing random yellow and purple pixels only on about the right of the tv. Its clearly cisible on a white screen but not as noticeable when watching a movie. And ideas what it could be? Ive read on this forum to up the Vs voltage abit since there are some purple patches on the display as well. I havent tried it yet. Any ideas where to start looking?

[dick_barton]

It would be worth checking all the solder joints on the Xsus board and ensure they all are good.
Search the threads for posts relating to adjusting some of the voltages. I can't remember off the top of my head which ones and by how much but it will be on the site here somewhere.
Finally I think that there may be an issue of panel aging if none of the above work out for you.

[ngth82]

Base questions first:

• What's the part number of your X-main board?
• Which parts (picture and circle them) did you replace a few months back?
• What were the PNs of the parts that you replaced?
• Were your replacements exact MPNs?
• Did you update the firmware of the TV after replacing the parts?
• Did you check your Vs and Va voltage values? Report back in this forum (don't modify them yet)

Some vendors (like LG) have a target waveform for the the panel charging and adjusting the voltages, and ramp rates may fix it. This could be a timing issue or the waveform isn't correct.

Here's the service manual for your TV, but i didn't see that information on the first pass: [LINK]