I really liked this video, but to make it even better.. dont skip the foult finding process. Thats the most interesting part in my opinion and its best part for learning. What you do you check first and why... following that process is what makes this repair videos so interesting. Other then that.. just keep posting more videos!! :)
Hello, i have two LDLC 850w psu that have the same problem, they run fine when i power them on, but when i turn them off, they wont turn back on again until i wait around 30+ minutes.. When i turn them on the first time they work just fine for days, the computer run perfectly, but when i turn it off it wont power on again. Can you please suggest where could the problem be since i opened and all seems fine, there are no shorted components and i dont have schematics for them. Thank you
Hello. It is a strange fault. Never met anything like that. My sugestion is that the superviser IC monitors output voltages and when you turn it off those voltages go below preset level and superviser sets one of its outputs high forbiding pwm/LLC IC to start until a capasitor that supply power to superviser goes down and superviser resets. Not sure about it but its the only sugestion i have.
Check capacitor, bootstrap one, around 220 microfarad, see on any atx power supply schematic, where standby and main 5V meet. Most probable is capacitor or protection circuit.
I have this power supply, it has coil whine, and the fan also makes clicking noise (maybe its hitting something? or is rotating in unstable way) do you have any idea what component is making the coil whine? (so I can apply some thermal pads on it to lower the vibration) thanks in advance
Coils can normally audibly whine at some specific frequencies (loads). In my experience 99% cases of whining were due to bad capacitors so you should check them as well.
I really liked this video, but to make it even better.. dont skip the foult finding process. Thats the most interesting part in my opinion and its best part for learning. What you do you check first and why... following that process is what makes this repair videos so interesting.
Other then that.. just keep posting more videos!! :)
Thanks. Ok. I will try)
Hello, i have two LDLC 850w psu that have the same problem, they run fine when i power them on, but when i turn them off, they wont turn back on again until i wait around 30+ minutes..
When i turn them on the first time they work just fine for days, the computer run perfectly, but when i turn it off it wont power on again.
Can you please suggest where could the problem be since i opened and all seems fine, there are no shorted components and i dont have schematics for them.
Thank you
Hello. It is a strange fault. Never met anything like that. My sugestion is that the superviser IC monitors output voltages and when you turn it off those voltages go below preset level and superviser sets one of its outputs high forbiding pwm/LLC IC to start until a capasitor that supply power to superviser goes down and superviser resets. Not sure about it but its the only sugestion i have.
Revisar las resistencias de descarga de los condensadores del primario.
Check capacitor, bootstrap one, around 220 microfarad, see on any atx power supply schematic, where standby and main 5V meet. Most probable is capacitor or protection circuit.
I have this power supply, it has coil whine, and the fan also makes clicking noise (maybe its hitting something? or is rotating in unstable way)
do you have any idea what component is making the coil whine? (so I can apply some thermal pads on it to lower the vibration)
thanks in advance
Coils can normally audibly whine at some specific frequencies (loads). In my experience 99% cases of whining were due to bad capacitors so you should check them as well.