LG 50PG60 Plasma Botton Half of Screen Out

[marshman]

This forum has been incredible helpful to me before, and I'm hoping you guys can give me some more advice and help me out again.

I came across an LG 50PG60 50" plasma real cheap, and thought I'd take a gamble to see if I could get it up and running. The top 1/3 of the screen is crystal clear, and the botton 2/3 is black.

All voltages check out from best I could tell, and a buddy who knows more than I do recommended I change out the Y-buffers. I bought them on ebay, and when I change them out, the entire screen lights up but is completely distorted and flashing mostly white light, with random red and black lines (picture 4). I put the old buffers back in and it goes back to the way it started out, with just the top 1/3 working crystal clear.

I'm at work right now so I won't be able to get to it until the morning, but any advice on where to start would be very much appreciated. Pic 1 is of the TV with the old buffers in, pic 2 the entire back, pic 3 is the y-sus, and 4 is the screen with the new buffers in. Thanks!

[tom66]

Re: LG 50PG60 Plasma Botton Half of Screen Out

It looks like a Ysus problem. But if the buffers were connected to a bad sustain, they could have been damaged; ideally you'd replace the Ysus at the same time.

[dcapper]

Re: LG 50PG60 Plasma Botton Half of Screen Out

Wow, I have the same problem but haven't replaced any buffers. Did you ever find out what was wrong with the tv?

[tocold4u2]

Re: LG 50PG60 Plasma Botton Half of Screen Out

Was the y main the problem here ?? I have the same prob almost

[dcapper]

Re: LG 50PG60 Plasma Botton Half of Screen Out

Lower buffer was the problem with the one I was working on. I had another LG that the YSUS was blown and the lower buffer too.

If you have a problem and you suspect the YSUS or ZSUS, touch the large heatsink when it's running. It should be warm.

[tocold4u2]

Re: LG 50PG60 Plasma Botton Half of Screen Out

I have the same prolbem..but the pictue at top half is
2-3" wide..but crystsl clear. bottom buffer was replaced.
The y main has all proper voltages and the heat sinks arent warm

[tocold4u2]

Re: LG 50PG60 Plasma Botton Half of Screen Out

Thanks dcapper...im thinking its the ymain (ysus)..

[tocold4u2]

Re: LG 50PG60 Plasma Botton Half of Screen Out

Lg heatsink was cool. but the sm one at bottom was warm..will focus on that

[dcapper]

Re: LG 50PG60 Plasma Botton Half of Screen Out

You can just change the chips under the heatsink. I did on an Akai tv made by LG but most people want $50 for the chip. You can get a used board probably for $75. Not worth the hassle changing the chip.

[tocold4u2]

Re: LG 50PG60 Plasma Botton Half of Screen Out

Yea..i will swap boards...wish the chips didnt cost that much

[tocold4u2]

Re: LG 50PG60 Plasma Botton Half of Screen Out

i still have the same prolbem..after swapping the y mwill see if its the upper bufferain...so i

[tocold4u2]

Re: LG 50PG60 Plasma Botton Half of Screen Out

Replaced the upper buffer and the tv is up and runing
now i have a extra y main board.. lol