repair and troubleshoot atx power supply 435 W

[Behemot]

Re: repair and troubleshoot atx power supply 435 W

A little off topic. When would you say the ESR for these low value caps starts to become a problem? I replace any that are 8 ohms or higher because that just tells me that if it hasn't failed yet, it is failing and will cause problems soon.

Depends on the capacity, GP 0,1uF caps have rated ESR over 10 ohms.

[senz_90]

Re: repair and troubleshoot atx power supply 435 W

Yes that reading is fine for low value caps. For electrolytic caps <100uF, capacitance reading is more important than ESR.

hmm.. i don't know that is more important on capacitance value than ESR with small value caps !! u give some useful advice.. but the problem i don't have a capacitance meter ahahaha..

A little off topic. When would you say the ESR for these low value caps starts to become a problem? I replace any that are 8 ohms or higher because that just tells me that if it hasn't failed yet, it is failing and will cause problems soon.

i think that low value caps starts to become a problem when it is above 5 ohm? right? yeah it is defective exactly when reads as 8 ohm i thought..

haaaaah...... !!! You are really crazy man !!! Continuously I was suggesting for that third non-running Power supply and you are applying it to running power supply .... huh ... lol !!!

If your both power supply is shocking a little - that means - You have a poor Ground Source . Make a Good Ground Source - I think your problem will be solve . I don't understand, what is the problem if PSU gives little shock, PC can run fine with that little shock . Because every PSU gives a little shock .

Probably Solution For Shock - Every rail +12V, +5V, +3.3V and +5VSB has their Discharging Resistors . Look at each rail you will find 10 Ω to 100 Ω and they are 1/2W to 2W Discharging Resistor Connected in each rail . Change those Discharging Resistors . I know they are measuring good . But they are not working well-enough as a new one . So, Change them without any question . I hope your problem will be solved . If your problem do not solve by changing Discharging resistors, then you have no other option left to solve that And Make a different Post with your Third PSU which does not run at all .

i think same as you that maybe the power supply don't have a good grounding..sorry for late announcement that my power supply have a voltage again... and the third one i wanna be post a new thread.. for note.. maybe it just a bad soldering on my pcb i think.. it just magically has a voltage when i desolder to see maybe where is the defective ones near transformer.. and after i am soldering it again it has a voltage !!! guess what !! with a little electric shock..

yeah i think that i wanna be change that resistor u means about it.. of course likes u said that resistor checked good. but that don't me bother to try fix it with ur solution... btw thank you very much for all of you advicing me.. the next is post a new thread about my cheapy third one.. i just think that's not valuable to fix it because it just a really bad psu i think.. with any cheapy component right at the psu.. but i wanna make a bench power supply from my that third one and experiment with some mods... hahahaha... lol.



anyway.. i want ask something that maybe looks funny question but is that safety and long last when i changed that Y caps with same value but it just have a 275V AC..? i just think that 275V AC is above my mains voltage but i know that switching psu is really really high voltage insidely when operate..Y caps before has a 1Kv of course...

Depends on the capacity, GP 0,1uF caps have rated ESR over 10 ohms.

but i have ever try to measure ceramic caps and some caps didn't make deflection.. is that normal? i just make my ESR meter from googling and looks linear with my VOM..

[Behemot]

Re: repair and troubleshoot atx power supply 435 W

Have you tried on different plug, for example in another room?

I meant electrolytic caps, they are made from 0,1 uF up. Most EST meters don't read such low values, but my ESR Micro v4.0 does, from 0,1 uF to 65535 uF

[senz_90]

Re: repair and troubleshoot atx power supply 435 W

Have you tried on different plug, for example in another room?

I meant electrolytic caps, they are made from 0,1 uF up. Most EST meters don't read such low values, but my ESR Micro v4.0 does, from 0,1 uF to 65535 uF

hmm.. why i can' t think like that before. so stupid me. lol. i haven' t try it..

ohh. i just makes wrong assume becoz my bad english. sorry. yeah i know the digital one's i have ever googling does measure with low value caps but the colleger likes me just hope a useful one's cheap enough for built..haha. i just do my free time to satisfy my hobby in electronica..