Arisotura
Well-known member
I ordered some supplies so I can redo my soldering on my Mac LC motherboard the right way. In the meantime I figured I'd focus on the power supply, which is the typical TDK one.
Of course, it had crapoed capacitors, so I replaced all the output-side capacitors and cleaned up the mess. The power supply now provides correct voltages, but... only when it feels like starting.
Generally, if I mess with it for a while, it will happily start, but if it's been left alone for several hours, it won't start, just doing nothing at all, no clicks, nothing.
I thoroughly cleaned the board, desoldering some components to clean up some more capacitor gunk, reflowing all solder joints, but the problem persists.
Something interesting I found out while probing around with my voltmeter: the moment I probed between the microcontroller's OVP pin and its ground, that kickstarted the PSU. As if something about the overvoltage protection circuit was bad.
In the meantime I desoldered the controller, cleaned it and put it back. We'll see.
Of course, it had crapoed capacitors, so I replaced all the output-side capacitors and cleaned up the mess. The power supply now provides correct voltages, but... only when it feels like starting.
Generally, if I mess with it for a while, it will happily start, but if it's been left alone for several hours, it won't start, just doing nothing at all, no clicks, nothing.
I thoroughly cleaned the board, desoldering some components to clean up some more capacitor gunk, reflowing all solder joints, but the problem persists.
Something interesting I found out while probing around with my voltmeter: the moment I probed between the microcontroller's OVP pin and its ground, that kickstarted the PSU. As if something about the overvoltage protection circuit was bad.
In the meantime I desoldered the controller, cleaned it and put it back. We'll see.