Hi Anita:
Many RCA tvs have common problem with mainboard where the standy LED will go from RED to BLUE when the power button is pressed but no sound and no picture. When LED is blue, you may not even be able to turn the TV off and it will be completely unresponsive until you unplug the TV. The problem is that you need a new mainboard, or specifically, a new EEPROM chip needs to be programmed and installed onto your existing board (less expensive than a new board)
This is likely not repairable by yourself, but a local repair shop should be able to do it for $80 or less.
Do you have sound still. Ifvso while the TV is on, shine a torch into the screen .
if you see a picture you possibly have a backlight issue
failing that tcon board but get it tested
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