First post, by pentiumspeed
This is unique power supply design.
Not the UC3844 IC the heart of the power supply, it is the unique thing about the power switch is two wires is isolated and connected to one winding in series of a small isolated transformer, the hot side winding is constantly oscillating with simple few TO 92 transistors detector circuit and when switch is closed, this shorts the winding out changing the impedance of transformer and turns UC3844 on.
That said, other than that, normal power supply design with few extras.
The problem is every time I have it under load even with no load even disconnected from motherboard, the PSU's fan is barely twitching every just bit over every second. The output voltages reading is low, around 1V to 2V on average. Checked the capacitors with ESR, they passes. Checked diodes and transistors, they checks out. Outputs checks out for shorts.
There's no blown nor any exploded things.
Still troubleshooting. The PSU is in pieces, main transformer, all the heatsinks with their components removed for better access and ease of troubleshooting.
The power supply also is unique: 3 of the wires connected to motherboard are in series with each onboard LED (three LEDs) for status, all LED is tied together to one supply rail, no else is connected to power supply's. There is 2 wires that is remote sensing of ground and 3.3V. Other than that, normal 5V, -5V 12V -12V power supply rectifier and regulators circuits plus power good and shut down wire.
Great Northern aka Canada.