RS485 not connecting - SolarLog SMA Board Repair - Electronics Repair 13

In this video, I repair an unknown/undocumented PCB from a SolarLog/SMA system where RS485 communication had stopped working. After a quick diagnosis, it turned out that the RS485 transceiver chip had failed and caused a short circuit, which also damaged the linear voltage regulator. I walk through the full repair process: locating the fault, replacing the damaged RS485 chip and voltage regulator, and measuring the board to confirm everything is working again. A typical example of fault finding on undocumented hardware—perfect for anyone interested in electronics repair, reverse engineering, and communication interfaces.