Sony XBR-85X950G Gray horizontal lines and vertical picture shift diagnosis?

[noisykid]

5.5 year old 85 inch Sony Bravia X950G started showing gray horizontal lines across the bottom of the screen and the picture shifts slightly vertically when it happens. The lines sometimes get bigger/smaller vertically and bounce back. See the video for the problem. It seems to be happening after it warms up after an hour or so. Happens regardless of source. Right now there's nothing but power cable connected and it's happening. We did hook up a new Nintendo Switch to our HDMI switching receiver today, and played for a while with no issues, but this problem didn't occur til a few hours later while watching a movie thru our AppleTV which we've had for years. Same receiver, but again, now nothing is connected and it's still happening with just the TV. Updated firmware. Unplugged from wall for a while. Nothing helped. T-con? Panel? Something else? I'm happy to test voltages, post more videos, etc., if anyone needs more info.

I just disconnected each side of the T-Con to test whether the problem persisted on the still connected side and it disappeared for the most part. One side still showed a slight flicker in the picture occasionally, but the main grey line issue ceased. The other side was 100% fine. I would've posted a video of this minimal flicker when disconnected, but it didn't show up on video.

Here's the video of the main issue:

https://share.icloud.com/photos/0b3m...IabrZJqcjjI2iA
https://share.icloud.com/photos/060s...JuWl3P0uG26DXg

Here’s self diagnostic:

[noisykid]

Just a quick update on this, I replaced the T-con board. Same issue, didn’t make it any better at all. After it warms up for 45 minutes or so it ends up with a jumping screen and a gray line at the bottom. I’ve ordered a new main board, that’s my last shot. Then I’ll call it dead if that doesn’t work.

[Storyteller12]

Usually horizontal lines are indication of screen defect. Could be bad cap on the buffer boards also. Check all caps on there

[Diah]

since its android TV, i will start by hard reset... keys pressing then plug it in wall release the pressing only after the front LED change from white to green.. leave it it will reboot 2 time

[nomoresonys]

Can you post a photo of this display defect?

[noisykid]

Can you post a photo of this display defect?

A photo doesn't show too much, the videos in my first post are better. In any case, here's one. It shows the gray line at the bottom, what it doesn't show is that when the gray line appears, the picture shifts upward. This is a constant cycle, it does it for a second or 2, then stops, then again. It's like a pulse.

[nomoresonys]

Maybe clean the flat ribbon connections of tcon both ends, can use a pencil eraser or isopropyl alcohol, may be this here: https://www.youtube.com/watch?v=SbGAkRgaZhs&t=0s