Hi,
Break up your trouble shooting (Simplify). Dis-Connect Xmit DC Connector and just get receiver going. Dis-connect mic and ptt.
Put the speaker connector directly to a speaker or headphones. Not a connector with switching connections.
So with tuning pot and function switch try getting the radio to tune. You should get noise and the "Birdie" about
7.200? Try to get a signal. Make sure your antenna is not shorted out.
Just a thought?
Keep going, and tell the group the status.
Mike, WA6ISP