Degraded solder joint on the transformer pins or central regulator IC.
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. Wannien 101v0 Power Supply Schematic | PDF - Scribd
RepairBench DIY | Reading time: 4 min
Startup and auxiliary
Prevent reverse-voltage feedback from damaging delicate switching transistors. Troubleshooting & Common Failure Points wannien 101v0 power supply schematic
: Complete loss of a specific voltage rail while the main fuse remains intact.
If voltage is missing, trace backward to the primary rectifier or external transformer. 2. Verify the 5V Regulator Output Locate the output pin of the main IC voltage regulator. Measure across the regulator's ground and output pins. Degraded solder joint on the transformer pins or
This isolates the high-voltage primary from the low-voltage output.
A: Audible noise usually indicates a failing output filter capacitor or a saturated transformer. Replace the large secondary capacitors first. If the whine persists, check the small ceramic capacitor (often 102/1nF) across the primary side snubber (RCD network). If you share with third parties, their policies apply