ihave an rca56" big screen. at first the volumewould get stuck.after playing with it turning up & down finally it would work again. now it will not turn on.wether i use the remote or the buttons. the power light will flash for an instant but will not come on.help
You probably have a bad switch or eeprom.
I would say you may have a bad ground connection in or around the tuner assembly or connection around the eeprom IC. This is a very sensitive area, and you should not attempt a repair in this area of the TV set as it is very sensitive to static.