Just don't ground yourself to the radio's chassis while doing it. If you hear nothing, the problem is downstream from this point. If it passes this test, the road is blocked upstream from this spot in the radio. Your body will pick up enough stray 60 Hz energy from the building wiring to hear in the speaker if the audio system is working from that point downstream to the speaker. Quick test when receiver audio is missing: Take a small screwdriver, lay one finger along the shaft and touch the tip to the center lug of the volume control with the volume turned up.
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