E7a Mb Pcb V3 Link Page

| Symptom | Likely Cause | Solution | |---------|--------------|----------| | No device found | GND missing or broken trace | Check continuity between debugger GND and board GND | | Target voltage too low (0V) | VREF not connected to board’s 3.3V rail | Solder a jumper from a 3.3V test point to pin 1 of the link | | SWD protocol error | Clock speed too high | Reduce SWCLK to 1 MHz or lower | | Reset failed | nRESET line held low by onboard supervisor | Temporarily disconnect nRESET; use software reset instead |

Often localized to the PMI632 Charger IC or the connection point to the sub-board via the main ribbon cable. e7a mb pcb v3 link

to identify and troubleshoot components like capacitors, resistors, and integrated circuits. Finding Resources | Symptom | Likely Cause | Solution |