This is a runaway high- voltage condition. When the TV turns on, the high voltage goes out of sight, causing the snapping or popping sound. Then the high voltage shutdown circuit takes hold, and the set cycles on and off repeatedly.
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Hi DiBd. Some electronic components in a tv can go out of tolerance during long periods of inactivity. I think that's what's happened to your set. Some component in the video section of your tv has given up.
This could be a High- Voltage shutdown circuit problem. The reason it will stay on longer with a bright picture, is the high voltage is slightly reduced, not allowing the shutdown circuit to shut off the set. But I believe your problems to be in the shutdown circuit.
If still under warranty or if you have no electronic repair experience you should take the set back to the shop or to a repair person. Some of the solutions described below can be dangerous, TV's are very hazardous to service. Even when plugged out, TV's can store very high voltages.
Generically speaking anything in the horiz deflection, hv development area will cause a no pix symptom, also a problem in the signal processor section, video river and output section as the crt/socket assembly.
I would also check the lopt transistor and probably the fuseable resistors around the lopt.