samsung ps43d450

[stejones]

here i have my samsung tv it all powers on and i get sound but need some help with the picture as its gone yellow and its pixalating abit

[tom66]

Re: samsung ps43d450

I'd check Vs & Va on power board are matching the panel sticker.
Then Vscan & Ve on Y-main & X-main respectively.
(Ve not marked but in the range of 90~110V)

For reference:
- pic 1 is X-main
- pic 5 is Y-main with Y-buffer (green)
- pic 7 is power board

[stejones]

Re: samsung ps43d450

vs on pinout of psu 206.8
va on pnout of psu 57.7
vsc on TP on ymain -185.0
ve on pinout on xmain 95.2

[tom66]

Re: samsung ps43d450

Ok, try set Vs to 215V and Vscan to -200V. Use adjustments on power board and Y-main to do this.

[stejones]

Re: samsung ps43d450

yes that looks like its got it tom66 cheers mate

[stejones]

Re: samsung ps43d450

this is the results tom66

[tom66]

Re: samsung ps43d450

Cool, now go to the SAMSUNG website and download the latest firmware for this set, put it on a USB stick and install it on the TV. This will prevent the issue getting worse.

[stejones]

Re: samsung ps43d450

ok cheers tom66 very much appreciated ty

[ratkajec]

Re: samsung ps43d450

hi, googled for symptoms, and it brought me here.

at first there was no picture after approx. 1-2 minutes after power on, but sound was on

now it has picture, but it is gone yellow, and red pixels appear at larger parts of screen

same model, except on the sticker values are as follows:
Va 58
Vsc -180
Vs 207
Ve 0

Measured values are:
Va 81
Vs 320
Vsc -260

any help would be welcomed

[dskall]

Re: samsung ps43d450

hi, googled for symptoms, and it brought me here.

at first there was no picture after approx. 1-2 minutes after power on, but sound was on

now it has picture, but it is gone yellow, and red pixels appear at larger parts of screen

same model, except on the sticker values are as follows:
Va 58
Vsc -180
Vs 207
Ve 0

Measured values are:
Va 81
Vs 320
Vsc -260

any help would be welcomed

Check battery in your multimeter. Black lead to chassis ground. If still high try to adjust voltages to sticker.

[ratkajec]

Re: samsung ps43d450

Check battery in your multimeter. Black lead to chassis ground. If still high try to adjust voltages to sticker.

Tried with another multimeter, now I'm getting lower values

Va 58,17
Vs 207,29
Vscan -179,78

[ratkajec]

Re: samsung ps43d450

And tried to set set Vs to 215V and Vscan to -200V

Also solved it, now I'm gonna flash latest firmware.

What's the cause of this error, and what if it happens again, which board should I replace?

Thank you for help!

[dskall]

Re: samsung ps43d450

I am no expert but I think as panel ages voltages need to be adjusted to compensate. Correct voltages on plasmas are critical. That is why there is a sticker on each panel. When voltage adjustments don't correct problem anymore I think panel has reached end of life.

[ratkajec]

Re: samsung ps43d450

Here we go again,
after few ok days, now again picture shuts off shortly after powerup, but sound stays on.

Any suggestions?

[Cromaro]

Re: samsung ps43d450

Ok, try set Vs to 215V and Vscan to -200V. Use adjustments on power board and Y-main to do this.

Thanks man, you are great!!!!