Pannasonic TX-42AS500B - Single fixed horizontal Line

[cagey1two3]

Hi guys, I've just replaced a faulty LED strip on my panny and when turning on TV, I've noticed a single fixed horizontal line on the upper half of the screen.

On a light picture it goes across the entire screen from left to right. More green on the left and then fades into a reddish colour. On a dark picture it isn't noticeable at all.


(Ignore the curved black line, that is a scratch on the diffuser sheet that need replacing too.)
Any ideas if it is a bad Tab, Panel or T-con issue.


Cheers

[Andrew F. Ali]

Re: Pannasonic TX-42AS500B - Single fixed horizontal Line

I can download/see the picture you posted.

[cagey1two3]

Re: Pannasonic TX-42AS500B - Single fixed horizontal Line

I can download/see the picture you posted.

Is that supposed to say can't instead of can?

Can anyone else see the pic I posted in the first post?

[Andrew F. Ali]

Re: Pannasonic TX-42AS500B - Single fixed horizontal Line

Yes thank you That should be can't. Sorry

[cagey1two3]

Re: Pannasonic TX-42AS500B - Single fixed horizontal Line

Yes thank you That should be can't. Sorry

Here is the direct link to the picture. Not sure why its not viewable on here

https://ibb.co/ghjS28



Thanks

[yohnsee]

Re: Pannasonic TX-42AS500B - Single fixed horizontal Line

Hello,
it may be a stupid question, but should we focus on the straight bluish line on the picture or the curvy one? The curvy one can be something stuck between the polarization layers. It could get there when you disassembled/reassembled the set.

[cagey1two3]

Re: Pannasonic TX-42AS500B - Single fixed horizontal Line

Hello,
it may be a stupid question, but should we focus on the straight bluish line on the picture or the curvy one? The curvy one can be something stuck between the polarization layers. It could get there when you disassembled/reassembled the set.

Yes it's the straight horizontal line and not the curved one as I mentioned in my original post.

Thanks...any help with a diagnosis would be helpful

[yohnsee]

Re: Pannasonic TX-42AS500B - Single fixed horizontal Line

Am I seeing it right, as it doesn't run all the way trough the display?
Is it also visible, if you connect a video source? Does it change in colour?

[cagey1two3]

Re: Pannasonic TX-42AS500B - Single fixed horizontal Line

Am I seeing it right, as it doesn't run all the way trough the display?
Is it also visible, if you connect a video source? Does it change in colour?

It does run from left to right but it's not one continuous colour. Through a video source it seems to fade from what appears to be green to red. On a black screen it isn't visible at all.
On very close inspection, the horizontal line is 1 pixel thickness.

[yohnsee]

Re: Pannasonic TX-42AS500B - Single fixed horizontal Line

You should take down the front bezel, to reach the side tabs. Try to poke them very gently, see if it changes the behaviour of the line. An other tought: at first disassembly, you may have stressed the panel, and this is the result from it.

[cagey1two3]

Re: Pannasonic TX-42AS500B - Single fixed horizontal Line

You should take down the front bezel, to reach the side tabs. Try to poke them very gently, see if it changes the behaviour of the line. An other tought: at first disassembly, you may have stressed the panel, and this is the result from it.

Have tried the tabs, but will give it another go.

these are close ups of the issue if it helps at all. I fear the issue might be panel related and I'm left with a permanent fault.

[Andrew F. Ali]

Re: Pannasonic TX-42AS500B - Single fixed horizontal Line

Looks like a Panel issue.

[cagey1two3]

Re: Pannasonic TX-42AS500B - Single fixed horizontal Line

Looks like a Panel issue.

Thanks for responding, looks like a wrecked TV then