Hitachi LE39H217

I have a working Hitachi LE39H217 that just started showing some intermittent backlight issues, as show in this image:

https://imgur.com/a/2x3TSVH

It's only edge lit from the bottom, but the dark spots come and go, and sometimes show up in different areas, ie. sometimes on the right side, or the middle, etc. I disassembled and tested each LED on the strip and they all work. A couple looked a little dimmer at the same voltage, but not dark like in the image.

Some of the pins on the LED ribbon cables that power the LED strip were folded over, so I thought maybe they were getting only intermittent power, but fixing that didn't resolve the issue.

Is this maybe a problem with the board powering the LED strip?