Since audio is coming from the VCR and FM, you know that the amplifier circuits are OK. Since it doesn't come from the TV section of the circuitry, you have to assume that there's a problem there.
Part of a TV circuit separates the audio from the composite audio/video signal. That is possibly damaged. Also, there's an FM detector circuit. I'd have to see a schematic to see if there's a separate FM detector for the FM radio and for the TV. If they are separate (typically, there's only one chip nowadays), then that could be bad.
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