Half the screen dark but not black (UN75MU6300FXZC)

Thanks for the suggestion, @jayeff.

Backlight is nice and even across the panel. I cleaned the contacts on all flex cables, but the issue persists. I even swapped the bottom (my LED panels connect on the bottom of the TV) flex cable pairs to the other side to eliminate that as well when I noticed they had the same part number. Any other thoughts?

Hi @jbarx19

Check if it also occurs when viewing the menu screens.

If it is still there then it is either the tcon board or the cables to the TAB board which connects to the panel. Since you've cleaned them and swapped them, if it is not the tcon board, it may the cable connectors on the TAB board (which would be strange for both of them to go) or the TAB board may have a problem. Maybe check it with a magnifying glass around the area of where the 2 cables connect to as it seems that since it affects the whole half that it must be near to where the cables both connect. Check for any damage, maybe slight cracks in the board etc

If the menu screens are OK then it is either the mainboard or the cable/cable connection between the mainboard and the tcon board

You did say that the strap "pressure point" was on the other side of the TV opposite to where the cables connect to the TAB board? So no pressure was placed on that side of the TV?

Thanks for the feedback, @jayeff!

The menus are also affected. I would agree that it’s something on the TAB board after reading a ton of posts. It’s tough with them on the bottom of the TV. I figured it would be safest to move it on its bottom, so we padded it and didn’t move it on its back. But I assume the issue might have been a bump on the bottom or something on the drive over.

You’re correct. The strap went over the top edge of the TV, and it was very mildly tightened.

I’ll take a very close look at the TAB board on the damaged side to see if I can find anything. Are you aware of how I could run a test on the TV and have it tell me the parts with issues or no?

@jayeff, I just inspected the TAB boards, removed the connecting flex cable between the two, and I can’t find anything visibly wrong about it. I’ve also looked at the bottom on the TV’s frame, and I can’t find any obvious points of impact or pressure that would give me an idea of where the damage might be.

Any other suggestions? I don’t want to quit, but this is certainly testing me!

@jbarx19

Since you can't spot anything and since you have swapped the cables I guess that perhaps to eliminate that it may be a tcon problem, is that you see if you can source a replacement board from a supplier with a no questions asked returns policy or at least one with a low re-stocking fee.

Other than that I know of no publicly available test program etc that would help. Samsung might have one but I don't know whether they do or not

Another thought that just occurred is that there must be a return path for the signals being fed down from the Tab connectors to the screen. Electrical signals don't just go to nothing so I'm wondering what is at the other end of the screen and each connection to the screen is a single line of colour, all of the 1920 lines. Do the lines of pixel components connect to something there, even if it is an earth connection etc or do they connect back to somewhere else??

I've never bothered about the other side of the screen away from the Tabs and that is where the pressure was applied. This may be just fantasizing on my part though.