Re: FSP400-60GLN worth fixing?


There is only one that is brownish. R42 (2R0) under the hot 5VSB diodes.
I have checked R42 several times and tapped it while measuring.
Guess it could still be charred on the inside and malfunction under load.

The big OST cap is ok. 361uF, ESR: 0.29.
No cold solder joints. PFC coil looks fine.
Could be some intermittent problem with the transformer or a leaky diode, but which one?

R81,C80 and R45A belong to the 5VSB. One would think that these are somewhat critical.
The...

Re: FSP400-60GLN worth fixing?

The following SMD components are missing:
D35
R22, R23
R32, R45A
R53, R54, R81
C31, C38, C80

Where to find the correct values?

Re: FSP400-60GLN worth fixing?

Don't think they are shorted.
The reason is I measured the 5VSB again today and it was only 4.68V.
The last few times I checked it was 5.05, but the PSU didn't start.

At the next power cycle it suddenly turned on and started working.
+12V: 12.27
+5V: 5.03
+5VSB: 5.07
+3.3V: 3.50 (high, but I only had bulbs and resistors on 5/12V)
Hmm....

Re: FSP400-60GLN worth fixing?

Hi,
I have a FSP500-60GLN that was used 24/7 for many years before starting to act up.
Eventually the PC wouldn't boot and it even lost the network connection at standby.

Pretty much every electrolytic cap was bulged and bad. I have changed everything except the big OST 390uf/450V.
Now, the +5VSB is stable but the PSU doesn't turn on.
D41/D42 have been replaced with UF4007. It was clear that this area had been running hot.

All cables are directly soldered to the board including mains and...