50PQ10-UB Weird burn-in issue

[jdoncouse]

Have a friend who brought me a lg 50PQ10-UB he explained there was an issue with its power button *which i could see why. it sucks* but they said after the tv got put together again after fixing the power button something *popped* and although the tv is working in the menus it is very staticy? with lots of weird pink dots. and when i plugged my snes to it to test how the video works. It's got a huge burn-in issue. Nothing like i've ever seen in a plasma before. there's letters staying on the screen for long periods of time. This is something new i've never seen and would like some opinions. I don't have time to take pictures atm but i will tommorow.. Let me know what yall think. Thanks

[jdoncouse]

Re: 50PQ10-UB Weird burn-in issue

Here is a photo of the screen *distortion* and burn in

[jdoncouse]

Re: 50PQ10-UB Weird burn-in issue

Anyone know?

[CapLeaker]

Re: 50PQ10-UB Weird burn-in issue

Is the whole screen sluggish to respond?

[tom66]

Re: 50PQ10-UB Weird burn-in issue

I would check -Vy and Vscan supplies. If you have a scope, check the ramp up/down waveforms are good. Also check the Vs and Va.

[Belgiangenius]

Re: 50PQ10-UB Weird burn-in issue

I agree.

[jdoncouse]

Re: 50PQ10-UB Weird burn-in issue

Sadly don't have a scope to check that and yeah there multiple spots that become sluggish I've seen spits in the top left and right too

[mmartell]

Re: 50PQ10-UB Weird burn-in issue

With the menus being normal I would suggest main or control board. Run the test patterns via control board jumper and see what you get.

[tom66]

Re: 50PQ10-UB Weird burn-in issue

Sadly don't have a scope to check that and yeah there multiple spots that become sluggish I've seen spits in the top left and right too

You can still check the DC voltages without a scope.

[jdoncouse]

Re: 50PQ10-UB Weird burn-in issue

Ok small update.. check the voltages all the 15v are around 17.3-4 the 5v are near 4.8 and the 193v are near 193v ... the logic board is blinking like a long blink then a short blink.. or __ . _ if that says anything i looked at the service manual and it sucks really. nothing good in it. thanks for the help so far

[tom66]

Re: 50PQ10-UB Weird burn-in issue

You will also need to check Vsc and -Vy which can be done without an oscilloscope. These points are marked on the Y-sustain board.

[jdoncouse]

Re: 50PQ10-UB Weird burn-in issue

Ok saw only a spot labeled like this -<--vy-->+ with a resistor in the middle hopefully this was the point i was suppose to test. for vy 189.5 and for the resistor spot for vsc 135.2v *also check where the y-sus connects to the buffer board for vsc. at that spot said 39.5v for vsc