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lyonadmiral
September 30th, 2012, 01:46 PM
Has anyone ever experienced this with their big screen TV? As you can see in the screenshot, the left side is much darker and has some graphic anomolies than the right side. Eventually (after 30 minutes) it would clear up but not it just stays like that forever. What components should I look at troubleshooting first?

Thanks,
Dan

10420104211042210423

Stone
September 30th, 2012, 02:00 PM
AFAIK, there's really only three components in these units, power supply, tuner and display. Since it doesn't appear to be power supply or tuner, I would guess display and I have some doubt as to whether it's even servicable.

luckybob
September 30th, 2012, 03:30 PM
under warranty? send it in otherwise replace the caps on the power supply. I'm willing to bet money at least one is bulging.

eeguru
September 30th, 2012, 04:15 PM
That's the backlight or backlight power supply going out. Is it LED or CFL?

lyonadmiral
September 30th, 2012, 04:21 PM
That's the backlight or backlight power supply going out. Is it LED or CFL?

CFL. But it isn't just a lighting problem, there is a distortion graphically in the screen.


http://youtu.be/gRRtjWhdrok

eeguru
September 30th, 2012, 05:03 PM
Ah I see now. No clue then.

patscc
September 30th, 2012, 06:51 PM
What's the source for the video ? I could swear the distortion looks like playing back a copy of a MacroVision copy-protected VHS tape.
patscc

lyonadmiral
September 30th, 2012, 07:22 PM
What's the source for the video ? I could swear the distortion looks like playing back a copy of a MacroVision copy-protected VHS tape.
patscc

HDMI connected AppleTV.

lyonadmiral
September 30th, 2012, 07:24 PM
So I finally got the EFI shield off the power supply board and took two pictures, perhaps you could look at them, particularly at what I've circled in red. Is that normal? If not, where does that "white goo" come from. Seems suspect to me.

Thanks,
Daniel

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Chuck(G)
September 30th, 2012, 07:30 PM
Yup, just your basic hot-melt glue holding things in place. Not unsual at all.

patscc
September 30th, 2012, 07:49 PM
Yuck(not the glue, the board). Is that a FR-3 or CEM-2 PCB I'm seeing there ?
patscc

lucasdaytona
September 30th, 2012, 07:52 PM
A few years ago, I had a monitor (CRT) that had a image distortion problem, like yours, with a certain time the problem was gone. The problem was with a vertical (I don't remember well) circuit IC, take a look if some IC of your TV heats in a different way from the rest.

lyonadmiral
September 30th, 2012, 07:54 PM
Yup, just your basic hot-melt glue holding things in place. Not unsual at all.

Then I'm at a loss, Chuck. On either the power distribution board or the AV processing board I can't see a thing that looks broke, burned, bulged or otherwise fubar'd.

patscc
September 30th, 2012, 08:12 PM
lucasdaytona brought up a point. Are the pictures accurate, or are we seeing striping or anything introduced by the camera ?
patscc

patscc
September 30th, 2012, 08:19 PM
By the way, what's the make/model, and do you have a can of freeze spray handy ?
patscc

Chuck(G)
September 30th, 2012, 10:07 PM
Yuck(not the glue, the board). Is that a FR-3 or CEM-2 PCB I'm seeing there ?

Most likely FR-2 if it's Chinese--you see a lot of that nowadays, probably because it's cheap.

patscc
September 30th, 2012, 10:20 PM
That was my first guess, but then I thought, "Naw, it's too white." Still yuck, though. I hate desoldering anything from that dreck.
patscc

Mike Chambers
September 30th, 2012, 11:20 PM
Unless you're experienced with servicing these kinds of things, I would personally start looking around for a new TV and call this one a loss. I guess it won't hurt to see if you can figure it out, but it's probably something complicated in the circuitry if it isn't the power supply or the caps. At that point you really need to know what you're doing most likely.

lyonadmiral
October 1st, 2012, 07:22 AM
Unless you're experienced with servicing these kinds of things, I would personally start looking around for a new TV and call this one a loss. I guess it won't hurt to see if you can figure it out, but it's probably something complicated in the circuitry if it isn't the power supply or the caps. At that point you really need to know what you're doing most likely.

I think you're right Mike, will just have to chalk it up. Just don't have the $ for a new tube right now, so I'll put up with the distortions.