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Sounds like a cap or fuse has blown in the set, you will need to take the back cover of and have a look, check on the power board for any blown caps, you will notice them straight away if one has poped, also check any fuses that may have blown they will also need to be replaced.
frist you need to check the fuse it is inside of tv by the power cord looks like this maybe a Panasonic tv did notsee any model number so i will gess as to what is wrong check fuse if blown need to replace with a white glass looking fuse of same value like i said dont know what model number this set is but the thermister could be at falt for the fuse to blow.
You have a shorted power component. Probably either the voltage regulator or the Horiz. output transistor. Both will be mounted to a heat siink of some type. The Horiz. power circuits along with the flyback transformer power up 90% of most TV sets.
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.
This is not an easy fix for most people! I suspect the ps is blown, R607, Q601,Q602 (use all org Sony parts, lots of factory 2nds around). This stuff blows to protect the fuse!!!!! Very rarely the input bridge rectifier or filter cap short. Check R622, if open or discolored also replace VDR601(doesn't go bad very often). Check Horz output Q502. Inspect whole board for any bad connections, all parts with heat sinks(regulator ICs). Horz driver transformer, 0.47uf to horz driver tr. There could be other parts bad (flyback??). Make sure no supplies are shorted, check audio output supply, vert output supply, etc. Easily $150 repair at a shop. Good luck!