LG 50PA6500 - Sound no Picture

[tnrmanring]

Re: LG 50PA6500 - Sound no Picture

The ribbons are the little orange things going into the glass of the panel.
The tear is often very hard to see. It's hidden on the other side sometimes. For me, I had to use a magnifying glass to see it. It will be on the top ribbon cable most likely.

i will look at it when I get it back tomorrow. i guess if its bad I can always part out the rest of the good components. if the ribbon isn't damaged is there anything else I should worry about that could have happened or would it be a good idea to replace the board and see what happens? I can get a top Y buffer for 35 dollars online. Thanks again for your help!

[tom66]

Re: LG 50PA6500 - Sound no Picture

If you put a new top y-buffer into a set with a bad panel the new buffer will quickly blow, so I wouldn't advise it until you're sure it's not got a bad panel. You'd just be throwing away money.

[freakaftr8]

Re: LG 50PA6500 - Sound no Picture

Yes this is an inherent problem with this design. One of the tabs hold the black plastic frame rubs the ribbon cable eventually from hot and cold cycles and there's a hole in the cable you can't see it with the naked eye but it's there and its most likely on the very top cable. What you should try to do is if you did get a new buffer board leave the very top cable unplugged and then try to power the TV up. If it stays on with just the top cable unplugged it is surely the problem. That is of course if you want to try to sink more money into the set which I believe is probably the issue anyway and I have yet to find a replacement cable for my set to try to glue a new cable back on with a special type of adhesive tape

[freakaftr8]

Re: LG 50PA6500 - Sound no Picture

typically what I have found is with these IC chips that LG is using for the panel is that they dont like a missing row to the panel. It's all or nothing.
Meaning if the IC cannot display every single horizontal line at the same time it will short out. If it doesn't display any lines but its receiving power its not a problem.

[tnrmanring]

Re: LG 50PA6500 - Sound no Picture

I want to thank you guys for saving me some money. I saw the ribbon and as you suspected, it is trash... so I parted it out and sent the panel to meet plasma jesus.

Funny thing is I bought a plasma tv from a resale shop on the cheap. its a 7 year old 50 inch LG plasma. I hooked my laptop to it Via HDMI and whenever I watch a video from my collection I get this occasional (about every 20 to 60 seconds give or take) faint but noticable "wave" that scrolls horizontally down the screen. TV input and whenever I am just usuing the internet doesn't cause an issue.

Only when I watch video on windows media. I had to do some toying with the system to get the resolution right from the intel graphics on the laptop to look right on the TV. I wonder if it isn't something to do with that.

Or maybe I should have just bought a CRT television and went back to the stone age...

[tom66]

Re: LG 50PA6500 - Sound no Picture

I think Freak might be interested in any ribbons on the panel if you can remove them easily.

[tnrmanring]

Re: LG 50PA6500 - Sound no Picture

I can't... I have no idea how to get into the panel...

[tom66]

Re: LG 50PA6500 - Sound no Picture

Take screws off edge of panel inside. The front glass lifts off and the ribbons are exposed. They're just glued on

[v3100]

Re: LG 50PA6500 - Sound no Picture

tnrmanring: I'm having this same exact issue with my 50PA6500. The top buffer chip on the upper Y buffer tested as shorted so I'm trying to understand where the damage might be on that ribbon cable. As far as I can tell my ribbon looks fine. Where was the damage you saw and how obvious was it? Did you have to remove the front plastic bezel?

[freakaftr8]

Re: LG 50PA6500 - Sound no Picture

Yes if you still have the panel I would be interested in a few ribbons from it. There glued on. Use heat from like a hair dryer and after peeling away the silicone like glue you can heat up the ribbon and slowly peel it away from the panel.
This would be neat to see if this is repairable or not.

[Ngray27]

Re: LG 50PA6500 - Sound no Picture

Does anyone have the Y buffer boards for this TV? Or know a good place to check? I can't seem to find them anywhere. Cheers.