Symbioquine
Solar Enthusiast
- Joined
- Jul 6, 2021
- Messages
- 422
I'm guessing that many other folks - like me - have also accidentally shorted in reverse their power supplies while top balancing such that somewhere between -12v and -56v flowed through the power supply.
When this happened to me, sparks flew and subsequently the power supply stopped working correctly - acting shorted, dials wouldn't produce intended changes on display, and negative voltage was produced from the terminals.
I wanted to post here and share that (at least in my case) it was a fairly easy fix. I posted some photos of the internals on the EEVblog forum and they confirmed my suspicion that I needed to repair the trace that had acted like a fuse and they also pointed out that the reverse protection diode likely got fried.
I repaired the trace with some solder and lifted the diode to test it. Sure enough, the diode was fried and I now have a working power supply - albeit without reverse current protection until the replacement diode arrives.
When this happened to me, sparks flew and subsequently the power supply stopped working correctly - acting shorted, dials wouldn't produce intended changes on display, and negative voltage was produced from the terminals.
I wanted to post here and share that (at least in my case) it was a fairly easy fix. I posted some photos of the internals on the EEVblog forum and they confirmed my suspicion that I needed to repair the trace that had acted like a fuse and they also pointed out that the reverse protection diode likely got fried.
I repaired the trace with some solder and lifted the diode to test it. Sure enough, the diode was fried and I now have a working power supply - albeit without reverse current protection until the replacement diode arrives.