Ver 13 typically uses a central IC to manage switching or logic. Use your oscilloscope to check for the "heartbeat" on the oscillator pins indicated in the schematic. If the VCC pin has power but there’s no gate drive signal, the IC is likely faulty. 3. The Feedback Loop
Missing a hidden jumper or a 0-ohm resistor used as a fuse. Troubleshooting with the BM5291 Schematic bm5291 ver 13 schematic verified
Even in Ver 13, heat near the output inductors can dry out caps over 3–5 years. Ver 13 typically uses a central IC to