Is this likely a panel problem, or something else?

[tucocaps]

Here is a picture of the problem. Thanks!

[tucocaps]

Re: Is this likely a panel problem, or something else?

Anyone? This is a 40 inch Panasonic plasma. I suspect the panel is shot, but just wanted another opinion. Thanks!

[tucocaps]

Re: Is this likely a panel problem, or something else?

Just bumping this here. I don't know the model , because it was a set i was planning on buying with this problem. Anyone have any ideas? thanks!

[tom66]

Re: Is this likely a panel problem, or something else?

It is could be panel but it if is cheap, the boards are worth around $30 total, and it maybe a loose connector for that part of the panel.

[Mrx3750]

Re: Is this likely a panel problem, or something else?

It definitely looks like a panel issue. I wanna say it's a tab bond or a TCON issue, but I'm not sure.

[tucocaps]

Re: Is this likely a panel problem, or something else?

Tom: Only 30 total for all the boards? Hmm, based on experience with this 50 inch that I'm still fixing, it seems the boards are about 20-30 a piece.

I just thought that particular "rainbow/barcode" failure was indicative of either a board or a panel. It run the entire vertical length of the screen. However, doing research has yielded conflicting information. Also, it seems if the connector is failed at the panel joint, then it's not repairable.

I'm planning on paying $40 for the set.

[tom66]

Re: Is this likely a panel problem, or something else?

Just because the parts are marked at $20~30 each doesn't mean they're worth that much if you can't sell them, based on my experience at least.

It won't be a broken connection on that part of the panel but the COF IC on the ribbon could be fried, but the typical symptom of that is a few lit up lines in a black bar, or a few lit up lines on a working bar.

[tucocaps]

Re: Is this likely a panel problem, or something else?

Well... not sure what to do, but it sounds like it might be worth the gamble. I didn't even want to chance $40 if it was surely a panel problem.

[freakaftr8]

Re: Is this likely a panel problem, or something else?

I agree might be worth a gamble in a Panasonic Plasma fails usually I see either a white bar black bar or a bar with just one line in it for a couplelines that would be representing of a chip on film failure this looks more like a classic c board problem or possibly a problem with the logic board but I could be wrong

[freakaftr8]

Re: Is this likely a panel problem, or something else?

there's always one way to find out fairly quickly and that is to remove the aluminum heat sink screws disconnect the tab from the c board and visually look at the chip on the ribbon cable if it looks burned on one of the corners the panel shot. compare to the check that's on the same ribbon cable on the buffer that's working

[RJARRRPCGP]

Re: Is this likely a panel problem, or something else?

Looks like a bad signal ribbon connection.

[tucocaps]

Re: Is this likely a panel problem, or something else?

Well , I finally got this set, and started to take a look.

Without complete disassembly of set, I can only see part of the ribbon connections. Visibly (under bright light), I see no defects, but I guess there could be something else going on, or under the metal where it attaches to panel.

Upon disconnect, I get solid white strips, which I confirmed is "normal" by disconnected the next ribbon as well. It actually appears that "half" the connector on the very end is currently not working, as one half shows proper display.

What I'm trying to determine is if this is the buffer board, or actually a problem with that ribbon connection. It looks like there are two very thin chips actually embedded on that ribbon connection ... so I'm really not sure.

[freakaftr8]

Re: Is this likely a panel problem, or something else?

Those are the chips you need to inspect. Look and see if ones burned out. You need to remove the 2 screws that hold the heat sync on the panel to see it.

[tucocaps]

Re: Is this likely a panel problem, or something else?

freak: The ones on the ribbon? I can see them, and I removed the screws for the metal plate that's attached to the ribbon, but the ribbon is glued to those plates as well. Wasn't sure that trying to pull the plate and risk damage to the ribbon was worth anything? How do I "check" these chips?

[freakaftr8]

Re: Is this likely a panel problem, or something else?

No don't pull the aluminum plate from the ribbon. That will damage the screen. just remove the metal plate from the panel disconnect the ribbon cable pull it down and look at the chips. Thrre are 2 to a ribbon. you should see them as soon as you look on the opposite side of the metal plate of the panel do not remove the metal plate from the ribbon you'll destroy it

[freakaftr8]

Re: Is this likely a panel problem, or something else?

if there's a ribbon problems or a chip problem on the ribbon you will see one chip on the last bank you're having a problem with that chip will look darker in one area compare it to the other chip on that same ribbon

[tucocaps]

Re: Is this likely a panel problem, or something else?

I think I see a small dark spot on the trace off the bottom of the chip. Haven't hit it with a magnifier yet ... but really both chips look OK as far as coloring being the same.

[freakaftr8]

Re: Is this likely a panel problem, or something else?

Ok thats what usually will happen. Can you post a pic of the two chips side by side?

[tucocaps]

Re: Is this likely a panel problem, or something else?

Hello,

I've been away from this project for quite some time, so I'm not sure if freakaftr8 is still frequenting this forum.

I was about to take a picture of these chips , and find out what if any repair could be done. Here are two pictures as best I could get of the ribbon connector and chips. Thanks for any ideas!

[tom66]

Re: Is this likely a panel problem, or something else?

One on the right looks discoloured, does this correspond to failure area? Is that just dirt - have you tried cleaning it off?