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This happens because of the color decoder in the TV. A TV color decoder has a switch that makes the TV image black and white when the received signal does not have sufficient power. Your TV color decoder switch remains in the black and white position (the TV receives weak signal or the TV color decoder is damaged).
Replace the TV antenna, try an antenna amplifier or a digital receiver before the TV.
Sounds like a power supply fault. You could try replacing all capacitors in the power supply and others areas around the line stage, with the same values. You may also want to check the tuner or "IF" circuit for dry joints. Hope this will help you. Kind Regards, JUS004