Re: Bad Y-buffer, Do I need sustain board also?

Hey dcreb,

I'm not an expert by any means, but I will tell you what I have had happen in regards to the LG 50' plasma I have fixed/am in the process of fixing. Originally it was given to me because it had a 3 or 4" black and/or red line running across the top. The owner thought it would be almost as much to fix as to get a new one, so he gave it to me.

So, I troubleshot and figured out it was the upper y buffer board. I ordered it and within a week I had a perfect picture! I was proud that for less...

Re: LG 50' Plasma no picture

Are you a nightowl too, awyatt2? I have been having a bunch of duh moments lately. I swapped the old, bad board on top to see if that was the issue. Same problem. So, I went ahead and ordered the bottom buffer from Shop Jimmy today cause I was feeling too lazy to take measurements before work.

My concern is that I find it strange that the bottom board went bad within a week of replacing the top one. I am quite rusty on my troubleshooting skills, as you can tell, but I hope there isn't something different or off in the newer boards...

Re: LG 50' Plasma no picture

I read through some of the other threads on same TV, same problem. I realize I should have done that first, but I guess I searched for problem, when I should have been searching for model number. Which is LG 50pg20.

Anyway, towards the end of that, a poster had unplugged both y buffer boards and got same problem with one unplugged, and grey screen with the other. I unplugged the top Y buffer board (which is the one I replaced), and there is no change. When I unplug the bottom one, I get my grey screen and no input signal. I would assume...

Re: LG 50' Plasma no picture



I do need that! Now I'm remembering why I got out of electronics. Can't wait to see what happens with the soldering iron if I need to use it. ...

Re: LG 50' Plasma no picture



Sorry, forgot to say there is sound, just no picture, so it is starting up.

Also, it doesn't really give a tolerance for the voltages. I assume .2 volts off is OK, is this not the case?

Thank you for your help....

Re: LG 50' Plasma no picture

OK, I can try to take the measurements on that that I haven't already taken on other boards. I've been purposely avoiding the power supply because I have tremors and it's hard keeping the leads still. I figured with my luck I would end up touching something I wasn't supposed to. Plus, it didn't give any indication of a power supply fault according to the tech manual. But, if that's where you would start, it's easy enough. Thanks.

Re: LG 50' Plasma no picture

Sorry, forgot pictures....

Hi, everyone. A guy from work gave me his TV because he thought it would cost as much to fix it as get a new one. It had a 3 or 4' black line at the top.

I used to be a computer/electronics tech in the navy, but I haven't really done any troubleshooting since I got out about 10 years ago. I figured what the heck, it may be an easy fix and I kind of miss troubleshooting, so I took it.

Did a little troubleshooting on symptoms (and Google is my friend!) and figured it was the top Y driver board. I replaced it and it worked beautifully for about a week. I was stoked...