Problem with Samsung Plasma PS43D450

[Mikeyboy2007]

hi guys got a Problem with Samsung Plasma PS43D450 when switched on there is alot of red discouleration in the screen i have taken a short video to show but as the tv is left on the problem seems as though it gets worse. Panel fault maybe ?

https://www.youtube.com/watch?v=f_z7XEumcjg

[Mikeyboy2007]

Re: Problem with Samsung Plasma PS43D450

someone else posted on a video on Youtube about an LG with same issue :

You need to take the back off and tweek the pots on the PSU board (using a multimeter set to DC volts) to what the lable says stuck on the metal work, your looking for something that says voltages Va 60V and Vs 186v obveously panel voltages differ so yours may be differant voltages, if they are fine you need to tweek pots on Y-SUS board 2 on board and 2 on duaghter boards, mark with marker and set back to orignal position if tweeking does not cure (hence the marker pen to mark orignal possition)

anyone think this would help ?

[tom66]

Re: Problem with Samsung Plasma PS43D450

Could you supply a picture of the fault. Vs/va unlikely to be cause but a good first step would be to verify them against the panel sticker.

Could be xmain Ve problem or sometimes an issue with Vsc. Also I think Samsung have a firmware update fit a similar problem so may be worth a look.

[Mikeyboy2007]

Re: Problem with Samsung Plasma PS43D450

upgraded the firmware Tom just made problem a whole lot worse.

[tom66]

Re: Problem with Samsung Plasma PS43D450

What's current Vs rating? Not what it tests, what's written on the panel?

[vinceroger69]

Re: Problem with Samsung Plasma PS43D450

tom slightly of topic but good look with starting your new job tomorrow? hope all goes well.

[Mikeyboy2007]

Re: Problem with Samsung Plasma PS43D450

VS rating is 207 on the panel

[tom66]

Re: Problem with Samsung Plasma PS43D450

OK set Vs to 213V and see how the picture changes.

[Mikeyboy2007]

Re: Problem with Samsung Plasma PS43D450

Tom probably a daft question but how do i do that ?

[sordids999]

Re: Problem with Samsung Plasma PS43D450

i think tom is saying adjust this part

[Mikeyboy2007]

Re: Problem with Samsung Plasma PS43D450

do i test the Vs as i am adjusting ?

[Mikeyboy2007]

Re: Problem with Samsung Plasma PS43D450

also how do i know which way to turn ? never tried doing this before.

[vinceroger69]

Re: Problem with Samsung Plasma PS43D450

mark the pot with a marker pen so you can return it to the original setting very slowly turn the pot and watch the screen to see if the fault alters dont turn the pot to high imo as the high voltage may cause issues im not sure what a safe voltage to go to will be maybe tom will advise when he gets a few spare minutes hes probably busy with his new job.
i would of thought turning the pot anti clockwise will decrease votage and turning the pot clockwise increase well thats my opinion you can alter it a little after marking it with a pen and test with a multi meter remember some times these pots are sensivtive so a little tweak alters a lot.

Edit!!! just reread toms above post as your voltage is 207 turn it up to 213 see if the picture gets better.

[tom66]

Re: Problem with Samsung Plasma PS43D450

Yes, that's correct. If the panel still faults try up to 216V, but do not go any higher or damage could result.

[Mikeyboy2007]

Re: Problem with Samsung Plasma PS43D450

ok will try that thanks guys and will update you. cheers

[Mikeyboy2007]

Re: Problem with Samsung Plasma PS43D450

should i be adjusting the VS on the PSU or the Ymain ? i tried VS on PSU and the voltage did not change its stayin on 184v which im assuming is too low as it should be 207v ?

[tom66]

Re: Problem with Samsung Plasma PS43D450

Yes 184V is too low. The only place you can adjust Vs is on the power supply. Adjust it there. If it will not go up there is a problem with the PSU that needs diagnosing.

First set it to 207V. If that is still bad try up to 213V.

[Mikeyboy2007]

Re: Problem with Samsung Plasma PS43D450

ok will try that Tom. if it keep probe on VS will i see a rise on volts as im adjusting ?

[Mikeyboy2007]

Re: Problem with Samsung Plasma PS43D450

ok so it wasnt 184v i was testing wrong part. the Vs on the PSU was originaly 207v tried 213v and 216v and problem did not resolve however when i turned back to 207v problem seemed worse

[tom66]

Re: Problem with Samsung Plasma PS43D450

OK I'm guessing that you were testing Vsc. Can you see a Ve test point?