75uq7590pub Has backlight no image

[ShatterMasters]

I have a 75uq7590pub that was dropped off for recycling. The Tv powers on and has audio but no picture, the backlights are working. Here is what I have attempted so far. Replaced main board, tried connecting one ribbon at time and testing. Not sure where to go from here. Any ideas?


Thanks!!

[EazyBone]

Lookup fixing TV with tape. See if you can get a picture that way.

But also try to disconnect one of the ribbons on the buffer boards that is orange/transparent at a time also. See if that does anything first.

Its no unheard of to get a bad main board, but if both boards have sound and no picture I would start checking the panel

[ShatterMasters]

I have tried the tape trick on some other models.

Tried un hooking the ribbons on the LCD flex with no change.

I was not the person who ordered the mainboard, I am having little luck finding the same tv version mainboard. Id assume that is important?

Thanks!

[EazyBone]

Ah okay, then it's possible to suspect the main also. Do you have both main boards? Do they both do the same thing? What's the EBT numbers on both

Tape trick will not always show a panel short, but it's semi reliable.

[Storyteller12]

I've fixed a few of these TVs in the 55 and 65" models with same problem. Seems the buffer board from the panel gets shorted out to the frame somehow. I removed the buffer board and put electrical tape where
the buffer boards contact any metal and problem fixed.

be careful not to rip/ tear one of the cofs.

Hope you have the same problem so it's an easy fix.

good luck, let's us know