For my TV, I followed your previous guide and was able to get the back light to come on.
I went a step further and unplugged all the cables from the main board and plugged things in one at a time. Started with the speakers and got sound(previously none). Next was the power button( the button wouldn’t turn the TV off but the remote would) still had sound.
Then one of the ribbons for the display and everything was the same. When I plugged the second ribbon in it went back to flickering. I switched which ribbon was unplugged and the problem persisted. I then tried one of the ribbons going between the screen controllers and got everything but picture (no surprise).
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