Toshiba TV 55L6200U horizontal lines + vertical bands. Any hope?

[oxi1158]

Hi all,

My TV had been showing for the last year some faint horizontal lines on all of its right side, about one out of each 4 of 5 rows of pixels. Not much of a bother, they were unnoticeable when watching a movie. Then, all of a sudden the horizontal lines became much stronger and crossed the whole screen, effectively making it a pain to watch.

I watched some youtube video where some guy "fixes" it with some tape on the ribbon cable of the t-con, so I tried that, but to no avail. Actually, after putting the TV back together again things worsened: apart from the horizontal lines, I saw now a big vertical band of corruption on the right side, plus intermitent flickering horizontal lines of corruption accross all the screen. Maybe I damaged the t-con or lcd panel while opening the TV, or maybe it was just a coincidence and part of the same problem. What do you people think?

I know almost nothing about TVs, but my best guess is that the problem is the LCD screen, which is non-repairable. I was wondering if, in this forum's opinion, either the horizontal lines or the vertical band might be due to the t-con, and if replacing it might solve it. I will order a new t-con if there's a small but real chance that this might solve both problems.

You can find linked here below some pictures and a video of the tv (at that moment coonected to my computer via HDMI).

Thanks a lot!

P.S: One of the two ribbon cables connecting the t-con to the screen seemed to have pins slightly damaged, but I swapped both ribbon cables and the screen showed exactly the same, with the vertical bands on the right side of it. So my guess is that the cable is fine, ...right?


Screen left side: https://photos.app.goo.gl/5GLde5zhZbNUp7BJ8
Screen right side: https://photos.app.goo.gl/xJgdkD744mgTXYTk8
Whole screen (video): https://photos.app.goo.gl/3xrfiRFPzs32JKqk7
T-con: https://photos.app.goo.gl/cB1EThSxBeUpfB9bA
Ribbon cable: https://photos.app.goo.gl/jCbJMGkNbybjSqFo8

[oxi1158]

Re: Toshiba TV 55L6200U horizontal lines + vertical bands. Any hope?

OK, I just added the pictures directly here rather than posting links to my G drive. Any opinions on whether it's repairable?

[knoxrebel]

Re: Toshiba TV 55L6200U horizontal lines + vertical bands. Any hope?

You can try to unplug 1 of the two flex cables from the tcon and see if it is isolated to a single side

[nomoresonys]

Re: Toshiba TV 55L6200U horizontal lines + vertical bands. Any hope?

You can try to unplug 1 of the two flex cables from the tcon and see if it is isolated to a single side

+1, looking like a tcon, driver board or panel issue, really hard to tell because you just can't exactly tell from the display.

[oxi1158]

Re: Toshiba TV 55L6200U horizontal lines + vertical bands. Any hope?

You can try to unplug 1 of the two flex cables from the tcon and see if it is isolated to a single side

From when I tried, I think I remember that nothing appeared on the screen, instead of just one side of the screen turning off. For either side. Swapping the cables didn't change any of it...

[oxi1158]

Re: Toshiba TV 55L6200U horizontal lines + vertical bands. Any hope?

+1, looking like a tcon, driver board or panel issue, really hard to tell because you just can't exactly tell from the display.

The driver board is the mainboard? Also, if it's of any use, there's a video linked on my original post where maybe it's more evident what is happening on the screen.

Any way that I could know if the t-con is to blame, other than buying a new one and trying it?

[nomoresonys]

Re: Toshiba TV 55L6200U horizontal lines + vertical bands. Any hope?

The panel driver board, is the board that the tcon ribbon cables plug into, sometimes something on there goes bad, like one of those little ceramic capacitors. You can test them for shorts or low ohms, multimeter set to 200 ohms test probe on each side of cap, see if any read short or read very low ohms, I would be suspicious of any testing lower than about 100 ohms, most will probably read higher.

[nomoresonys]

Re: Toshiba TV 55L6200U horizontal lines + vertical bands. Any hope?

Well that last picture of your lvds cable doesn't look too good, I think I would start with replacing that, did you look on ebay?

[oxi1158]

Re: Toshiba TV 55L6200U horizontal lines + vertical bands. Any hope?

Well that last picture of your lvds cable doesn't look too good, I think I would start with replacing that, did you look on ebay?

I agree, it doesn't look good at all. This is one of the two cables that go from the t-con to each half of the screen.
But the thing is: I swapped the cables, left for right, and the screen displayed exactly the same problem, still on the right side, same as before. So that should indicate that the cable is not the problem? To be clear, the other cable looked perfectly good, didn't seem to have any damage of any kind.

[budwich]

Re: Toshiba TV 55L6200U horizontal lines + vertical bands. Any hope?

check the connector that the cable goes into. The "damage" might have got stuck in the connector.

Further, how are you disconnecting / connecting the ribbon cables... you are releasing the "clamping mechanism" and NOT just pulling / pushing on the cable, right?

[oxi1158]

Re: Toshiba TV 55L6200U horizontal lines + vertical bands. Any hope?

check the connector that the cable goes into. The "damage" might have got stuck in the connector.

Further, how are you disconnecting / connecting the ribbon cables... you are releasing the "clamping mechanism" and NOT just pulling / pushing on the cable, right?

Yeah, I'm pretty used to open and do basic repairs on electronics, mostly computers and laptops, though no soldering. I did release the ribbons carefully, unclamping them first.

But you're right, maybe there's some piece of the cable stuck in the connector. I'll try to inspect it and clean it with a toothbrush when I open the TV again. Thanks!