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I repaired an RCA same model with a very similar symptom. I found bad connections on the printed circuit board at L411 and L 412 (coils) in the horizontal drive circuit. Give the set a good Fonzie ( Happy Days) smack on the side and see if it comes on. LOL. Bad connections are common with that model. It is probably worth fixing and no, lightning didnt do it.
This sounds to be a faulty flyback transformer, as it heats it gets a shorted winding and the protection circuit shuts the set down to avoid big sparks. this is not a user solvable problem unfortunately and i would recommend taking it to an electronics repair shop and getting a quote for repair.
I am not familar with that particular set, but this is what I would check (assuming you don't have a surround sound system hooked up to it as it would sound like a tuner problem otherwise). If you have external Audio/Video jacks with cables hooked up to the Direct TV box, move the video cable and see if you lose video when it is jiggled. If so, you either have a bad cable or connection/connector. When you say you have to turn the TV off for about 30 minutes, do you leave the directTV box on? If so, then the problem seems to be with the TV. Otherwise, maybe the direct TV box is at fault -- leave the TV on and turn off the cable box for a half hour and try it again. You have a few possibilities here, good luck.
You apparently have a high voltage arc.
Possibly the anode lead to your picture tube.
Also the flyback transformer could be arcing.
If you're not experience with tv repair, you need to have a tech check it for you. The circuits operate at very high voltage and if you get into it you can get a possibly fatal electrical shock.
Be careful !!!
could be that the main b+ filter Capacitor went bad and blew up. Also could have been the horizontal output transistor shorted and the flyback poped. In eather case it would be recommended that you take this set into a repair shop unless your familar with HV circuits in tv sets. Good Luck