Some hobbyists replace the faulty internal board with external 48V power bricks, though this requires custom wiring to simulate the 7V standby signals.
The subwoofer fails to turn on, often caused by a blown fuse or a failure in the primary switching MOSFET. hys3c210-cs power supply
Finding a direct retail replacement for the HYS3C210-CS can be difficult, as it is often sold as a "service-only" part. Some hobbyists replace the faulty internal board with