LG TV Model: 21FS4RG The sound is gone after 10 to 15 minutes

Hello Sir,

I have LG TV old Model: 21FS4RG. When I turn On the TV, the sound is gone after 10 to 15 minutes. It makes a noise and then gone. When I turn off TV and Turn on again, the sound comes and gone after 10 to 15 seconds.

Please help to fix it. I THINK IT HAS SOME CIRCUIT PROBLEM. May be some capacitors or other Components make problem after heating

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