Ahoy Zeldie ;
Not knowing anything about this ‘Chinese’ TV , regardless if it is plasma or led it would appear one of the multiplexing chips on the board across the bottom has gone bad . A re-seat of the ribbon connectors may help . It could also be a problem in the main board . Too bad you dont have a set to swap boards to for sure pinpoint culprit . Check for loose mounting screws for board to chassis .
If there is a service shop you can reach that services these they could swap out or UNLIKELY have the service jigs and diags to tell them which board .
The screen appears fine BUT there is a small chance it is a failed mating of ribbon cable to screen matrix .
I would hate to spend any money on that set when you could go to Walmart clearance and get a large set for less than 300 $cdn
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