TK-830H No audio in from mic, or accessory plug.

[KX4KDH]

Now I am up to only the second eBay dud out of many radios I buy there......

I have a TK-830H That presents with no audio going to RF from the mic, or from the audio in pins on the 15 pin accessory plug. Nothing I can see that looks obvious. Hopefully, it's a logic board..... (because I have a spare)

Any suggestions?

[KX4KDH]

Swapped logic boards, and still have the same problem.... I'm not quite at my wits end with this, but getting close....