Problem with black screen. ( Possible cable. )

Last year I replaced the battery on my Note 10.1.

Since that time, on occasion my screen would go weird colors. The colors would swap around. Sort of like showing the negative of the image.

It would eventually fix and last for a long time before going bad again.

I finally got fed up so I opened the tablet and disengaged the rightmost ribbon cable at the top several times. Some results, but not complete.

I then tried totally removing the cable t both top and bottom and replacing.

Since then my screen has gone completely black.

How can I tell if this is a problem with the cable. or with other hardware?

Or possibly the system got set to absolute minimal lighting. How can I reset this?

If neither, how can I diagnose what the problem is?

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