As shown in the image below, if you let the Xadow GSM breakout jump in where between the touchscreen and the Xadow GSM+BLE, then the “Probe test 1&2” checked the connection between the Xadow GSM breakout to touchscreen and to the Xadow Audio.
The SPK_OUT_N and SPK_OUT_P refer to D2 and C2 respectively on the Xadow GSM breakout, check below:
if the speaker is working well, “Probe Test 3” should tell you an impedance of speaker at about 8 ± 20% ohms.
