Hi,
First of all I'd like to say that I'm a beginner with component repairs.
I have succesfully repaired a few PSU's and LCD monitors,
but it all was a relatively simple task of replacing easily identifiable damaged parts.
Now I bought two damaged PSU's to learn on (Corsair CX600 and LC power LC6600) and they both share the same problem: 5vsb only
The Corsair looks new, no dust on pcb or parts, only a little dust on the fan, seems like it was running a few days and died. It even smells like brand new. When I first tried it, it had only 2.3 volts on 5vsb and obviously did not turn on.
It had a failed Samxon GF 2200uF 10V cap in the middle of the main PCB, which i believe belongs to 5vsb circuit, and another
smaller (I think 22uF 50v) on the smaller daughterboard - both shown on pic 1 in the middle.
After replacing these 5vsb now gives me 5.13 volts, but the PSU still won't turn on.
I've checked all electrolytic caps I could find and found one Samxon RL 100uF 16V in the output filtration probably failed (over 2 ohms ESR),
so I replaced that one with a new 100uF 16V low ESR Samxon (don't remember the series, but it's not green). Rest of the big caps in output filtration are Samxon GF, but they are ok.
LC power has the same problem - 5vsb only. I found one visually damaged resistor with 10times more resistance. I checked all the small caps except one that i believe belongs to 5vsb (last pic, in the middle glued to the pcb with that yellow crap) and am currently working on the bigger ones. The smaller caps are Nicon and the bigger ones mostly Teapo and I think I saw a CapXon or two as well.
What steps do you usually follow when facing a 5vsb only problem? If you can point me in the right direction on what to look for, that would be great. The second psu is still work in progress regarding capacitors, I still didn't check all the output filtering caps, but I'm more asking for a guide of what to do when this problem is not caused by caps.
I can of course post more pictures of both psu's, write down brands of whatever parts I can see, etc., no problem, just tell me what do you want to see / know.
Any help will be much appreciated, thanks in advance.
First of all I'd like to say that I'm a beginner with component repairs.
I have succesfully repaired a few PSU's and LCD monitors,
but it all was a relatively simple task of replacing easily identifiable damaged parts.
Now I bought two damaged PSU's to learn on (Corsair CX600 and LC power LC6600) and they both share the same problem: 5vsb only
The Corsair looks new, no dust on pcb or parts, only a little dust on the fan, seems like it was running a few days and died. It even smells like brand new. When I first tried it, it had only 2.3 volts on 5vsb and obviously did not turn on.
It had a failed Samxon GF 2200uF 10V cap in the middle of the main PCB, which i believe belongs to 5vsb circuit, and another
smaller (I think 22uF 50v) on the smaller daughterboard - both shown on pic 1 in the middle.
After replacing these 5vsb now gives me 5.13 volts, but the PSU still won't turn on.
I've checked all electrolytic caps I could find and found one Samxon RL 100uF 16V in the output filtration probably failed (over 2 ohms ESR),
so I replaced that one with a new 100uF 16V low ESR Samxon (don't remember the series, but it's not green). Rest of the big caps in output filtration are Samxon GF, but they are ok.
LC power has the same problem - 5vsb only. I found one visually damaged resistor with 10times more resistance. I checked all the small caps except one that i believe belongs to 5vsb (last pic, in the middle glued to the pcb with that yellow crap) and am currently working on the bigger ones. The smaller caps are Nicon and the bigger ones mostly Teapo and I think I saw a CapXon or two as well.
What steps do you usually follow when facing a 5vsb only problem? If you can point me in the right direction on what to look for, that would be great. The second psu is still work in progress regarding capacitors, I still didn't check all the output filtering caps, but I'm more asking for a guide of what to do when this problem is not caused by caps.
I can of course post more pictures of both psu's, write down brands of whatever parts I can see, etc., no problem, just tell me what do you want to see / know.
Any help will be much appreciated, thanks in advance.
Attached Files