Mine did the same thing. Just happened to have a worthless Best Buy service contract. The tech came out and said that it was the power supply and or the fly back something or other. He then prodceeded to tell me that he could not get parts for my 2 year old tv. You might check with a local tv repair shop and get some estmates on replacing these 2 parts.but at 80-100 bucks and hour for labor....
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Check the tv remote control look for the button said CC get it on to CC1,2,3 one of these numbers will show close captioning,if the the show have captioning.Or tries go into the menu goto Captioning or Text functions turn on 1,2,3 will get the captioning functioning.
Make sure your remote is totally away from the set.
Make sure the buttons on the set are not sticky
If both of those are ok, it's your E-Prom in the set. RCA's are notorious for this, not a major repair, maybe $75-100. The 8 leg e-rom is only about $6.00
If the front panel lock is on, you will need a working original remote (or a universal remote properly programmed for RCA) to turn the set on. The IR receiver is next to the buttons on the fromt but the RCA IR receivers are very reliable, and I have yet to see a bad one in a modern RCA TV. Once you turn the set on by remote, you can enter the menu and turn the FPA off.
I have never heard of FDA lock. If you mean FPA lock, this is the Front Panel Access lock (also called Child Lock) built into the TV. To unlock FPA, turn the set on with the original remote, enter the menu, navigate to the page with FPA and set it to off.