Proscan 40LC45S Ghosting bad color

[CraigR]

An odd problem with a Proscan 40LC45S. Turned it on cold this morning and picture was just great and left it go for about 45 minutes and no problems. To double check I turned the set off for about 3-4 minutes and now color is way off and there is ghosting. See this video:
http://s231.photobucket.com/user/WAL...de9ca.mp4.html
Not sure what to even check with this one.
I have it off now and put in a cold place to see if that will "reset" it somehow.

[tom66]

Re: Proscan 40LC45S Ghosting bad color

Looks like a panel driving fault. I'd check the t-con board voltages: AVDD (15~17V), VONE (~20-30V), VOFFE (-5~8V)
However, if it's intermittent, you might be looking at a panel fault.

[CraigR]

Re: Proscan 40LC45S Ghosting bad color

Check right at the board?

[tom66]

Re: Proscan 40LC45S Ghosting bad color

??

[CraigR]

Re: Proscan 40LC45S Ghosting bad color

I can not see anything marked with that. Forgive my ignorance but where to I tap in to check those voltages? here is a TCON board pic.

[tom66]

Re: Proscan 40LC45S Ghosting bad color

On yours, I see VON_P, VON, VOFF, and AVDD test points. Little gold pads, white silkscreen next to them.

You use your meter, red probe on point, black probe on chassis, report the voltage reading.

[CraigR]

Re: Proscan 40LC45S Ghosting bad color

Wow do you have some good eyes! took me a while and a magnifying glass but here is what I got VON P=22.68V VON=18.53V AVDD=15.11V

[tom66]

Re: Proscan 40LC45S Ghosting bad color

Check VOFF too, if you could.
So far, those are all good, so I suspect the panel.

[CraigR]

Re: Proscan 40LC45S Ghosting bad color

Voff=7.45v

[CraigR]

Re: Proscan 40LC45S Ghosting bad color

So bad TCON?

[tom66]

Re: Proscan 40LC45S Ghosting bad color

Voff should be negative, is it?

[CraigR]

Re: Proscan 40LC45S Ghosting bad color

Sorry, Yes it is negative.

[tom66]

Re: Proscan 40LC45S Ghosting bad color

Tcon is working. Probably panel.

[CraigR]

Re: Proscan 40LC45S Ghosting bad color

Hmmm, so a mainboard problem would never cause that either right?

[CraigR]

Re: Proscan 40LC45S Ghosting bad color

So screen is shot then?

[tom66]

Re: Proscan 40LC45S Ghosting bad color

Yes, that is my opinion, if you were to try to fix it you could try a tab bond shim, but no guarantees at all if that will work.

[CraigR]

Re: Proscan 40LC45S Ghosting bad color

Took apart down to tabs and pushing or touching and moving on the tabs made no difference what so ever to the picture.

[CraigR]

Re: Proscan 40LC45S Ghosting bad color

Well looks like one for scrap. I got a TCON board just to give it a shot and same thing so I will need to scrap this one out.

[auser]

Re: Proscan 40LC45S Ghosting bad color

I have one of these TVs and it began making a sizzling sound from the back side on the right side, when viewed from the front. Yesterday, Mar 9, 2015, it stopped working with no picture and no sound, except for a popping sound. It will not turn on, status light middle bottom red, and I cannot turn it on using the side power button. I took the back cover off and no obvious problem. I need to test voltages on the PS board. Are any service manuals available? Thanks.