Solved! The bottom of My lg TV is black top is perfect

[david.shaw1381]

Bottom of my lg TV is black top is perfectly ok

 

[helpstar]

Do you still have warranty?

press the frame from left to right bottom, sometimes the flexes between panel and boards are lose
or the T-Con board is faulty.

Also you can try unplugging it from the wall, push the power button fro about a minute, replug the power cord and power on normally.