Samsung PS51E450 Plasma Problem.

[Mikeyboy2007]

hi guys trying to repair this. problem is when you plug in and it goes to switch on screen flashes then powers back off again then tries to boot back up. gives a few flashes of the power red led then led goes off and when tv should be on it displays nothing, no light or anything etc coming from screen.

[tom66]

Re: Samsung PS51E450 Plasma Problem.

Look at LED on logic board - does it flash continuously once a second, or once every 5 to 7 seconds?

[Mikeyboy2007]

Re: Samsung PS51E450 Plasma Problem.

tom its not doing either. its flashing every 2-3 sec then another flash a second later.. heres a link to see i uploaded to youtube to give you and idea of what i mean.

https://www.youtube.com/watch?v=Z2Vz2Jth7lY

[Mikeyboy2007]

Re: Samsung PS51E450 Plasma Problem.

any ideas Tom66 ?

[tom66]

Re: Samsung PS51E450 Plasma Problem.

Patience, I do have a life outside of badcaps.

OK, I think Samsung have changed the pattern for E-series panels (2012.)

That looks like an error code to me.

I would check Vs/Va on power board.

[Mikeyboy2007]

Re: Samsung PS51E450 Plasma Problem.

lol.. sorry Tom. ok will do that and post results. cheers

[Mikeyboy2007]

Re: Samsung PS51E450 Plasma Problem.

ok tom had to switch the tv on and off a few times to get voltages, its as if there is a surge going through it every few seconds so tried to catch volatges but they where all jumping between 0v to what is listed below.

VS 0.07v
VS 0.07v
NC 0v
VA 0v
GND
D15v 14.49v
D5.3v 5.24v
GND
VS-ON 3.15v
VS-CON 0.74v
PS-ON 3.32v
GND


hope this helps

[tom66]

Re: Samsung PS51E450 Plasma Problem.

Ok, now unhook Y- and X-main board power connectors and repeat the test, check voltage on power board end. Does Vs rise higher?

[Mikeyboy2007]

Re: Samsung PS51E450 Plasma Problem.

disconnected those boards Tom, the 2 VS at 0.07v very slowly rises back up to that rather than jumping about

[tom66]

Re: Samsung PS51E450 Plasma Problem.

OK so far from what you've told me I'm thinking power board problem.
Can you provide a close up picture of the power board & I will highlight any necessary tests.
I would probably suggest a new power board - for a new TV like this they are likely to be cheap.

[Mikeyboy2007]

Re: Samsung PS51E450 Plasma Problem.

OK Tom here are 2 PSU pics, one with flash on and one with flash off..

[Mikeyboy2007]

Re: Samsung PS51E450 Plasma Problem.

I have another board exact same as this pulled from a 43 inch model but all voltages seem to match. Could I try that ?

[Alastair E]

Re: Samsung PS51E450 Plasma Problem.

Board from 43" wouldn't be strong enough for a 51" It just wouldnt supply the current needed--although very similar, I'll bet the Vs transformer is smaller on the 43" PSU

[tom66]

Re: Samsung PS51E450 Plasma Problem.

It seems this PSU gets its on/off signal through the "X-main" (although calling it that is a bit of stretch, there's hardly anything on it...) That then might come from the Y-main or control board.

Can you get a picture of the labels around the X-main and Y-main connectors?

[Mikeyboy2007]

Re: Samsung PS51E450 Plasma Problem.

is this what your after Tom.

[tom66]

Re: Samsung PS51E450 Plasma Problem.

Yes - is there another connector running from X-main to the bottom panel boards or to the control board?

[Mikeyboy2007]

Re: Samsung PS51E450 Plasma Problem.

this is the layout of the tv Tom, what cable is it you mean ?

[tom66]

Re: Samsung PS51E450 Plasma Problem.

X-main right hand side board in that photo, I think there is one connector hiding behind the main board. Please locate it.

[Mikeyboy2007]

Re: Samsung PS51E450 Plasma Problem.

this cable Tom, leads to the two boards running behing the metal shield at the bottom of the screen.

[tom66]

Re: Samsung PS51E450 Plasma Problem.

OK, can you get a listing of the labels near that connector; or a picture of them?