After you verity that the TX/RX issues is resolved, I would connect a pair of wires to the Tip and Sleeve, or Ring and Sleeve (both are connected to the output of the audio amp on the main board.? Unplug the speaker from the main board, and connect the wire from the temporary plug to the the wires of the speaker.? If the audio is there, then the speaker is OK.? If not, then look at the wire/speaker to verify that there is not a broken connection.
At this point the we know that the audio sections of the main board are working (you have audio in the headphones).? We just need to know where we are losing the audio in the link to the speakers.
BTW. you are removing the headphones when testing? the speaker?
73
Evan
AC9TU?
