Sometimes comes on. most times doesn't come on

remove the battery for about a 5 minute then insert it again, then press the on button

Try holding the power button down for several seconds. Or disconnect the power (pull the plug or remove battery). When you turn it back on, it will probably tell you that you didn't shut it down properly and hopefully you've saved whatever you were working on.

I have had a problem like this in the past you can try taking the electric access panel usually on the side of the equipment. then look inside you will see a wiring harness inside and it literally takes nothing to bump it loose. This happens when people move these units they are pretty fragile and can be tempermental. Make sure the unit is unplugged while you adjust the wiring harness. If that deosnt work your display board is probably bad. Hope that helps

I work on a lot of this model RCA, a reputable tv shop can repair this type of problem for less than a new set. You really need a techician for component level repair of this nature.

Hold the power button in on the computer for 5 seconds. Wait another 5 seconds. Now hit the power button as you normally would to turn the PC on. It should boot normally.

remove battery plug in power...see what happens ...nothing happens press and hold power button until you hear response(shut down)press power as usual to boot.if it doesnt work first time try a few times more remember to keep power button pressed to shut down.

remove battery and use it off A/C power adapter, mine only works this way, maybe shorted battery.

Unit has circuit problems, have serviced

It's possible that the convergence IC's may be bad in this set along with a few resistors. A TV repair shop should be able to fix the set for you.