I purchased this amp from a wholesale warehouse (two of them). One works and this one powers up, but has no sound output. These amps were both banged up in the shipping process.

I read the voltage output at the input terminals when the amp was hooked up I get nothing. On the other amp I would get a fluctuating voltage depending on the music that was playing.

I figure since the amp has not been used I have a loose/broken connection somewhere and this should be an easy fix. I have been reading online about testing different parts of the amp for certain readings on my dmm, but I am little confused I guess.

Any suggestions on where a loose/broken connection might be?