First disconnect the power and signal cables. Then, open the back of the TV carefully. Lots of screws of different sizes. Remember where each screw goes. You will find flat cable connectors and sockets. Just pull out each connector from socket, blow into the holes to clear any dust. Plug them back one by one. Then close the back and put the screws on and plug in the power and signals. see if this worked. Lots of times, dust settles in the connectors and if you are in a humid environment, the dust and humidity form a thin layer of insulator enough to block low level signals.
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First disconnect the power and signal cables. Then, open the back of the TV carefully. Lots of screws of different sizes. Remember where each screw goes. You will find flat cable connectors and sockets. Just pull out each connector from socket, blow into the holes to clear any dust. Plug them back one by one.
Then close the back and put the screws on and plug in the power and signals. see if this worked. Lots of times, dust settles in the connectors and if you are in a humid environment, the dust and humidity form a thin layer of insulator enough to block low level signals.