I have an AZZA Alpha PSAZ-500C12 that is really and FSP250-60GEN. It was off but connected to line power for some time. It has 5Vsb but will not start. No caps are bloated and there does not appear to be any overheating. Do you think it might be the Teapo SEK 22uf 50v startup cap? The caps are mainly Teapo with a few CapXon, 2200 6.3v and 100uf 25v. .
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Re: FSP250-60GEN will not start
test the switchers, then HV circuit, diodes, resistors -
Re: FSP250-60GEN will not start
After probing around, I found 12v shorted to ground. I removed the secondary heatsink and it istill shorted to ground. I checked the caps they weren't shorted. So caps are good, switchers are good. What should I be looking for next?Comment
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Re: FSP250-60GEN will not start
strange. there aren't that many components that can go short there. Fan? Feedback circuit?Comment
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Re: FSP250-60GEN will not start
Look for zener diodes, the fanless ZEN I got had shorted zener. It was working even with that, just huge ripple. Still haven't found the problem BTW. The ripple was so bad it cooked brand new Samson RS in half an hour…Less jewellery, more gold into electrotech industry!
Half of the computer problems is caused by bad contacts 
Exclusive caps, meters and more!Hardware Insights - power supply reviews and more!Comment
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Re: FSP250-60GEN will not start
Are there any ceramic caps between the 12V rail and ground. If yes, those would be prime suspect too.Comment
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Re: FSP250-60GEN will not start
Thanks Guys,
I didn't see any ceramic caps on the 12V circuit. I am thinking the PS223 may have shorted. Since the supply is not really anything to write home about, especially since AZZA claims 500 watts out of this 250 watt supply, I am going to strip it and give the remains to my ewaste recycler.
I have better supplies in my spares pile.
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Hi folks,
I have a couple of IBM NetVista desktop computers from around 2000-2001. They have Universal Scientific Industrial (USI) Pro286i motherboards, 733MHz Pentium III processors, and a whole bunch of bad Teapo capacitors. One board has visibly bad and venting capacitors, while the other doesn't look too bad so far.
The board with venting caps works fine, while the good looking board occasionally refuses to power on unless it's left for about 30 seconds after connecting the power - even with a known good power supply. (I am however aware I'll need to check the PSU... -
Back in 2020 i bought a (2nd hand) compact ATX psu to replace my current one. My PC case only fits very short ATX power supplies so i didn't really have the choice of buying a decent 80Plus unit. The current unit is a modded YoungYear unit that i made a thread about a while ago:
A "nice" YoungYear unit? - Badcaps
The "new" unit is a KDM-M6480 480W psu, the 480W number is a typical KDM bullshit claim of course, but the 24A rating on the 12V rail seemed reasonable and the "Active PFC" claim gave me a bit of hope that this was going to be decent-ish.... -
Normally, I never post repairs this quick after I do them, because… I am usually very slow.
But today, I’m making an exception here. Why? No idea. Perhaps only because the repair details are still “fresh” in my head… which is ironic, given this is a 16 year old monitor that hardly anyone will care about today. It is new to me, though. 
I picked it up last November from someone on my local Craigslist. It wasn’t very close to where I live, but was close to a family friend that I had to go visit anyways. So after watching the posting on Craigslist for a few weeks and seeing it getting...
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Thought that it would be worth rescuing this one, but it's got one bulged Teapo that is in front of the big coil.
Would it be perfectly OK to replace this 4700uf SC (which currently measures 600uf and 1.2ohm ESR) 5V output cap with XYJ 3300uf? More specifically, was the original 4700uf Teapo cap overkill?
i also (inline) tested the 3300uf SC (which is parallel with a 2200uf SC cap, that is right next to it) on the 12V rail, and get a measurement of 5500uf and around 0.1 ohms ESR - So those caps look like they are still healthy? -
I pull a buch of (Teapo, Samxon, Ltec, Taicon, etc.) caps from older power supplies and they always check out very low ESR and capacitance in spec. Are chinese caps much better than they used to be?
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