I think its because of a TCON connector to the mainboard issue. Mostly because a component has failed or not able to produce a signal for that part of the board. Shouldn't be too expensive of a fix I believe.
Can try troubleshooting the TCON to main board line. Jiggle it a bit and see if any response on the TV panel. But do be gentle as the cable is notorious for being brittle and fragile. Very hard to find a replacement.
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