TV repeatedly turning off/on (power cycling)
As of now, my after turning on my TV, I can see the backlight turning on for a second or two, then turning off for a second or two, and endlessly repeating this cycle.
This began to occur a couple days ago when I was playing a game on my Xbox One, which was connected to the TV through my receiver. Mid-cutscene, the picture became darker (but still visible) and then vertical green lines appeared over the image, growing and moving horizontally across the screen. Once I realized this wasn’t some weird-ass cutscene thing, I turned everything off, waited a minute, and turned the receiver back on, which also powered on the TV via CEC, and then the power cycling began, which I eventually narrowed down the the TV behaving as I described above.
I took the back off the TV to see if I could find any obviously bad capacitors, but from what I can tell (I am no expert) they all look pretty good to me.
I was hoping somebody here could give me any advice and/or guidance.
I did some more testing/experimenting/bumbling and determined that the TV will not power cycle when one half of the cable going between the power board and the main board is disconnected (it’s the “northmost” connection on the “east” side of the main board, see picture).
After realizing this, I reconnected it and then powered on the TV after disconnecting one of the cables coming out of the main board, one by one sequentially. I also tried disconnecting both ribbon (FFC?) cables coming out of the mainboard simultaneously. With each test, the TV still continued to power cycle.
So, I think the problem might be the cable going between the power board and main board. I tried finding it on samsungparts.com, but the only cables listed there are FFC cables, so I’m not sure how to go about getting a replacement.
Thanks in advance for any ideas!