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Old 05-05-2014, 02:52 PM   #1
Per Hansson
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Default FSP400-60GLN worth fixing?

Hi, got this PSU from a co-worker.
Was gonna recap it and give it back to him but I changed my mind after a closer inspection.

Not only are all Capxon's on the secondary bloated and or leaking electrolyte.
Even the primary 270F 400v cap was bloated, I removed the top plastic cover to be doubly sure...
After desoldering it's impossible to measure ESR (open circuit) and my capacitance meter shows 40nF (yes, nanofarad!)

I also realized that the coil by it is severely burned, but it looks like the core is fine, it's not black atleast...
And on the underside the bleeder resistor has blown up, it's a SMD thingy marked "R44" on the PCB. Any idea what value it should be? (It measures 2mega ohm now)

EDIT 2014-11-22: This thread shows that Capxon LP has this common problem, so this could be the actual reasons for why the coil gets burned in these powersupplies!
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Last edited by Per Hansson; 11-22-2014 at 05:08 AM..
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Old 05-07-2014, 05:57 AM   #2
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Default Re: FSP400-60GLN worth fixing?

I have 2 of them , with the same problem. The pfc coil is completely burned. The value of R44 is 2ohm marked 2R0
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Old 05-07-2014, 02:42 PM   #3
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Default Re: FSP400-60GLN worth fixing?

Welcome to Badcaps cxg and thanks for the info!
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Old 05-10-2014, 05:30 AM   #4
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Default Re: FSP400-60GLN worth fixing?

Fortunatelly I have only once encountered burned coil, it was heating up to like 150 C and quite smelling so the owner noticed, I've replaced it and it was fine.

Not really sure…if you have bunch of coils and 400V caps mined from bad PSUs lying around, you can recap it, otherwise it is no way worth it having to buy new caps for that. You have to somewhat help the +5 V SB circuitry otherwise it will bake itself. Than there is problem with D8 caps (you can squeeze say 50:50 D10 and D8 in there, only D10 caps with some serious problems) so it is lot of work for problematic 80 PLUS PSU…

BTW I have NCC KZH 1000uF/16V D8 caps being manufactured ATM…that may seriously help with these GLN supplies
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Old 05-10-2014, 07:22 PM   #5
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Default Re: FSP400-60GLN worth fixing?

Yea Behemot, I did not even check the price of the large bulk cap before I made this thread.
I was shocked to see they go for around 10, and not only on my local Swedish electronics store but even on ebay! (Genuine Japanese caps of course).

And then there is of course the question if the coil is ok, I desoldered it and it measures 0.5ohm, but I don't know if that is correct or not...
Maybe I should relegate it to target practice like the FSP 250-60HEN from this thread?
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Old 05-11-2014, 09:06 AM   #6
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Default Re: FSP400-60GLN worth fixing?

Haha nice, what caliber was that?

I hope those KZH caps will arrive soon, after some HP, Huntkey and LC Power PSUs I only have aprox. 10 of these 350W GLN units for low-power systems…recapping these is hell. Older units with passive PFC were fine, but these…
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Old 05-11-2014, 10:33 AM   #7
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Default Re: FSP400-60GLN worth fixing?

Rooz told me it was caliber .243

Yea some 8mm caps would certainly be useful if this PSU where to be fixed.
But then again if you look at that 250w PSU we used for target practice it used the same size of heatsinks as this 400w model, not really reassuring is it?

http://badcaps.net/forum/showpost.ph...&postcount=164
http://www.badcaps.net/forum/showpos...59&postcount=4
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Old 05-11-2014, 10:50 AM   #8
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Default Re: FSP400-60GLN worth fixing?

Can do the power and even in spec, I have reviewed the GIgabyte Superb 460 which is basically this GLN (or also BlueStorm II 400 W). It is 80 PLUS certified so they improved the efficiency. But needs decent airflow otherwise it would bake the CrapXon caps in matter of months. Such as it is, they were quite noisier than similar quality PSUs (Seasonic or Enermax from those times).
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Old 05-13-2014, 08:51 PM   #9
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Default Re: FSP400-60GLN worth fixing?

I've seen dozens of these. Even brand new, the PFC coil is that dark brown color. The new revision doesn't use CapXon, but OST and Teapo. A slight upgrade
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Old 06-06-2014, 09:16 AM   #10
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Default Re: FSP400-60GLN worth fixing?

What a bummer, recapped the thing completely, and replaced the burnt resistor.
As I switched it on it went up in smoke
DM311 5vsb chip exploded & the resistor R44 I had replaced underneath went too.
Not sure what went wrong, maybe the value for R44 is not 2ohm at all.
It tripped the 10Ah fuse in the house...

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Old 06-06-2014, 09:51 AM   #11
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Default Re: FSP400-60GLN worth fixing?

clean the soot and tar off so we can get a better look.
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Old 06-06-2014, 10:02 AM   #12
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Default Re: FSP400-60GLN worth fixing?

That R44 is used as the fusible resistor to feed the B+ to that SMPS IC, so value is correct. You can see that it fed the B+ the one pin of the transformer T2, you can also see the RCD snubber network on the two pins of the T2 transformer. The IC must have shorted out already that is why the original was blown open.
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Old 06-06-2014, 10:06 AM   #13
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Default Re: FSP400-60GLN worth fixing?

stj: There are two more pictures attached to my post above.

budm: The powersupply did not explode when I plugged it in with the original bloating caps so to me it's likely that I must have damaged something in the recap
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Old 06-06-2014, 10:13 AM   #14
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Default Re: FSP400-60GLN worth fixing?

"And on the underside the bleeder resistor has blown up, it's a SMD thingy marked "R44" on the PCB. Any idea what value it should be? (It measures 2mega ohm now)" So it was not already bad?
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Old 06-06-2014, 10:19 AM   #15
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Default Re: FSP400-60GLN worth fixing?

budm: I'm not sure, I measured 2mΩ but that was in circuit.
With it out of circuit now I can't measure anything.
I tried cleaning it but it's impossible to read what it is rated for, markings have been burned off...

Thanks for the annotated picture, you edited it in after my reply above
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Old 06-06-2014, 10:20 AM   #16
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Default Re: FSP400-60GLN worth fixing?

"2mΩ" 2 Mega Ohm, that means it was already bad since it is very low Ohm resistor to start with.
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Old 06-06-2014, 10:36 AM   #17
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Default Re: FSP400-60GLN worth fixing?

Yea but I replaced it with a 2R0 resistor as that is what "cxg" wrote in the second post above that it was supposed to be.
I did not realize it was a fusible resistor though!
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Old 06-06-2014, 10:39 AM   #18
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Default Re: FSP400-60GLN worth fixing?

2R0 value is the correct value for that circuit, it is because the IC was already shorted and took out the first resistor, it is not bleeder resistor either.

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Old 06-06-2014, 10:44 AM   #19
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Default Re: FSP400-60GLN worth fixing?

Here is the spec of the SMPS IC and how it is used.
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Old 06-06-2014, 10:45 AM   #20
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Default Re: FSP400-60GLN worth fixing?

Ahh ok, now I understand.
So the original fusible resistor had already failed open "saving" the DM311.
Then I put in a _regular_ 2Ω resistor: RK73H2BTTD2R00F
And it blows up more spectacularly since it's not a fusible resistor.
And the DM311 was already shorted but was now allown to explode since the resistor did not burn up fast enough.
Thanks for setting me on the right track
Do you think anything else is damaged from this or it might be ok with just a new DM311 & fusible resistor?

Last edited by Per Hansson; 06-06-2014 at 10:52 AM..
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