There are four capacitors on the power board that the switch is connected to that are failing, eventually they will go completely and the set wont turn on at all. You need to replace the capacitors and the problem will be resolved. Find someone to replace them for you, they will cost less than \302\2434 GBP to buy if you can do it yourself (or someone you know) probably over a hundred to get an engineer to do it
Your TV probably has a faulty power supply. Get it repaired before it gets worse and damages other components.
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