LG Plasma (MU-42PM11) Weird colors after repair

[switch998]

I just got an LG MU-42PM11 as-is from ebay for $46. The original problem was that it wouldn't power on, which was fixed by installing a new fuse into the Ysus board. The TV powers on, but the pixels are slow to fire, and colors are very bad.

I already measured the voltage off of the VS and VA pins and it matches the voltage on the panel. I'm going to measure VSETUP and VSETDN, but I don't think they're the problem.

I'm attaching a video & a picture, I want to know if I need a new Y-sus board or if the panel is bad. The TV will not show dark colors, and light colors will blend together. The TV is 5 years old, after all.

Also, I need a way to check panel hours, the service menu (code 8741) doesn't tell me anything about the panel.

Here's the video: http://www.youtube.com/watch?v=bytRzUo6dJI

[kc8adu]

Re: LG Plasma (MU-42PM11) Weird colors after repair

blown fuse on ysus=bad stk on the big heatsink.pop of death.

[Dgtech]

Re: LG Plasma (MU-42PM11) Weird colors after repair

For $46, you could have gotten better wall art. Thats all this thing is worth at this point. If this were an LCD, it would be worth fixing.

By the way, I've seen people purposely blow a fuse to make it seem like an easy fix and once you get the fuse corrected, you see the real (more serious) problem.

I personally, only deal with LCD's. Plasma's are harder to fix and cheaper to replace. Not worth it.

[switch998]

Re: LG Plasma (MU-42PM11) Weird colors after repair

At this point I'm not concerned with cost or what the TV is worth, I just want to see if I can fix it.

I'll take a look at the stuff under that heatsink. Also, the big red cap C83 or C84 has a bump in it, I can't find a replacement (250 685K).

[Wizard]

Re: LG Plasma (MU-42PM11) Weird colors after repair

Mal-charge of plasma either points to the YSUS or ZSUS.

Cheers, Wizard

[switch998]

Re: LG Plasma (MU-42PM11) Weird colors after repair

Just an update, a new ZSUS fixed it. The service manual reports that the panel has 41 hours on it. That doesn't seem right, is it possible that somebody reset it?

[PlainBill]

Re: LG Plasma (MU-42PM11) Weird colors after repair

Just an update, a new ZSUS fixed it. The service manual reports that the panel has 41 hours on it. That doesn't seem right, is it possible that somebody reset it?

Highly likely, but not impossible. I had a 4 year old plasma set recently that had about 1000 hours on it. It failed just out of warranty and had beek sitting in a closet for about 3 years.

And if you read the ads on Craigslist it is amazing the number of 5 year old TVs that are being sold as 'Like now, in box'.

PlainBill