Panasonic TC-P50U50 vertical bar 1/4 of the screen

[Phragdoll]

Got home one day to see the left quarter of the screen completely black. Turned the tv off for a few moments and back on, it's come back white and has been that way ever since.

The vertical bar is exactly 1/4 of the screen. When there's a picture, it's usually white. When there's no input, dark grey.

I've described the issue to two repair shops in town, one said PDP and the other T-Con. Please tell me there's hope! I wouldn't mind taking on this project if it actually has a chance!

[Hamie]

Re: Panasonic TC-P50U50 vertical bar 1/4 of the screen

Lower F address board might have failed but far more likely to be a panel fault.

[Moreno83]

Re: Panasonic TC-P50U50 vertical bar 1/4 of the screen

This looks like a panel fault.

It's a plasma tv , it does not have a t-con board.
You could try to reseat the cables on the lower c boards , maybe it's dust. Most likely the panel is failing.

Can you post some pictures of the tv? The back cover must be removed.

[Phragdoll]

Re: Panasonic TC-P50U50 vertical bar 1/4 of the screen

Thought it was strange that he said that! I won't get a chance to pull it apart until the weekend, so I'll get some pictures of the insides then.

Thanks everyone!

[Phragdoll]

Re: Panasonic TC-P50U50 vertical bar 1/4 of the screen

Okay, so I have it open now, but aside from the dust and what seems to be an extra liberal application of thermal paste on a heat sink, I don't see anything that stands out. Took the pictures as it was, surprised there wasn't more pet hair inside!

[ReeceyBurger123]

Re: Panasonic TC-P50U50 vertical bar 1/4 of the screen

Reseat the ribbons connections the address boards would be my first step.

[tw2005]

Re: Panasonic TC-P50U50 vertical bar 1/4 of the screen

can you see how the panel ribbons are heat sinked? Just curious. In the 2010 models and earlier each ribbon had it's own heatsink bolted down, in a 2011 U30 I noticed they used a single metal strip bolted down to keep the ribbons heatsinked.

Just a warning don't run the panel without the heatsink on those botttom ribbons if you start to fiddle down there.

Also there in the service menu there is a flip option , both horizontal and vertical.

[tw2005]

Re: Panasonic TC-P50U50 vertical bar 1/4 of the screen

Looks like similar setup, that silver metal strip running along the bottom with lots of silver bolts in it is the heatsink clamp,I can just see the ribbon heatsinks underneath.

It'd also be interesting to see if those bolts are tight on the left side viewing from the back. They're the same type that worked loose on the SC boards but I think they're less of a problem on solid metal to metal contact.

[Phragdoll]

Re: Panasonic TC-P50U50 vertical bar 1/4 of the screen

Reseating the cables didn't do anything, but I definitely want to try replacing the C boards before giving up. Found a troubleshooting guide and it's given me a little bit of hope, especially since it didn't look like the usual 2-3" wide vertical bar or pinstripe of death.

[Alastair E]

Re: Panasonic TC-P50U50 vertical bar 1/4 of the screen

Try reseating the ribbons to the Mainboard too...

Had a G20 mess about like this, and thats what it was...

[dj01fad]

Re: Panasonic TC-P50U50 vertical bar 1/4 of the screen

hello there.
I had a 42g20 with a similar problem and it was a defective A board...

[Moreno83]

Re: Panasonic TC-P50U50 vertical bar 1/4 of the screen

That could also be a reason. Maybe heating the videochip might make a small difference and tell you if the board is defective or not.

[tw2005]

Re: Panasonic TC-P50U50 vertical bar 1/4 of the screen

hello there.
I had a 42g20 with a similar problem and it was a defective A board...

That's where going into the service manual and trying the flips may give an indication if it's the A board or not

[SquaL]

Re: Panasonic TC-P50U50 vertical bar 1/4 of the screen

Hi, for some reason I cannot create new thread. I have the same problem with this model TV. Can someone please confirm most likely cause? Height of the lines adjust to the height of the image being displayed.

[SquaL]

Re: Panasonic TC-P50U50 vertical bar 1/4 of the screen

Here are picturesof defective TV.