I recently was given a UN70NU6900FXZA that would only boot loop once plugged in (auto powers on when plugged in). I found that disconnecting the lower (right side) LVDS ribbon, then plugging the TV in, followed by reconnecting the lower LVDS ribbon will allow the TV to work 100% normal as far as I can tell (no lines, no discoloration, no dimming or anything like that).
I tried the tape method on the lower LVDS ribbon and found that if I cover pins 10 and 11 (counting from the bottom up) allows the TV to boot normal but 25% screen all the way to the right side is discolored. While trying the tape method I had covered many other pins 6-12 pins at a time and I could get it to boot without 10 and 11 being covered at the time so it's possible 10 and 11 are not the actual problem. Also disconnecting the other LVDS ribbon instead also stops the boot loop but it didn't boot up when I reconnected it, though it's possible that at the time I didn't seat it all the way or something.
Maybe the main board is browning out at boot up for some reason and causing it to endlessly attempt to boot up but I have not been able to identify any bad/shorted components. I did borrow a thermal camera from work and looked around for any unusually hot components but nothing stood out. I looked for TVS diodes on the buffer boards that I read commonly fail but I could not find any.
I've attached pictures of the main board and the covered pins for reference, if there are any other pictures that would help I will post them on request. Any suggestions are welcomed. Thank you.
I tried the tape method on the lower LVDS ribbon and found that if I cover pins 10 and 11 (counting from the bottom up) allows the TV to boot normal but 25% screen all the way to the right side is discolored. While trying the tape method I had covered many other pins 6-12 pins at a time and I could get it to boot without 10 and 11 being covered at the time so it's possible 10 and 11 are not the actual problem. Also disconnecting the other LVDS ribbon instead also stops the boot loop but it didn't boot up when I reconnected it, though it's possible that at the time I didn't seat it all the way or something.
Maybe the main board is browning out at boot up for some reason and causing it to endlessly attempt to boot up but I have not been able to identify any bad/shorted components. I did borrow a thermal camera from work and looked around for any unusually hot components but nothing stood out. I looked for TVS diodes on the buffer boards that I read commonly fail but I could not find any.
I've attached pictures of the main board and the covered pins for reference, if there are any other pictures that would help I will post them on request. Any suggestions are welcomed. Thank you.
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