Re: FSP400-60GLN worth fixing?
Thanks guys for confirming what I reported. I do NOT provide fake data! Bh seems to think he knows more than my students who worked within the industry. Shame as he's provided a lot of insight and assistance from the practical side of PSUs.
Elitist
Senior Member
Last Activity: 07-28-2018, 11:03 AM
Joined: 04-04-2006
Location: GB
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Re: FSP400-60GLN worth fixing?
- yup, in storage. I believe the recommended storage protocol is to ramp up to rated every so often (but nobody does this except, perhaps, a few manufacturers with excess stock). A lower level continuous 'soak' also preserves the film without risking the organics in the electrolyte, aqueous solvent or not. Again, rarely done in practice. No wonder the trade is transferring to tantalum, but (i) not much option for mobiles (ii) tantalum is rare, very expensive/difficult to extract & refine (iii) Coltan mineral source in DRC and slave labour raises...Leave a comment:
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Re: FSP400-60GLN worth fixing?
Extremely unlikely as I usually replace one at a time into the same configuration. Bit puzzled why there's such doubt about storage deterioration? Makes perfect sense to me! They didn't blow, they failed fairly quietly if I remember and replacement with new stock fixed the problem.Leave a comment:
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Re: FSP400-60GLN worth fixing?
"insane stress" - nope, 1-4-1 m/b replacement, mainly 2200/6.3 some 3300/6.3 - long since disposed of, so now in the Al remelt pot. The film on such is very thin, guessing, ideally best stored under minimal bias. No such thing as 100% coherency. Then there's the electrolyte...Leave a comment:
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Re: FSP400-60GLN worth fixing?
Not only do some bulging caps continue working, presumably temporarily, but when removed, the vents can kick in and the bulging sometimes disappears. Since gaseous components must've been lost, undesirable that the now flat-again units should be re-deployed as their lifetime would be short and possibly spectacular. Notwithstanding, only ever seen/heard two of thousands expire in pyrotechnics.
Furthermore, I had stored a small number of new, expensive Rubycons for future for several years but they failed as soon as deployed. The chemistry of...Leave a comment:
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Re: FSP400-60GLN worth fixing?
Thanks, Per. Quite a few diodes have been mentioned so wanted to be certain which.Leave a comment:
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Re: FSP400-60GLN worth fixing?
" the diode " - which one? position, value/type, etc?
One of the big problems with all these mass produced structures is that flux removal both after wave soldering and, esp. after-machine-assembly, hand soldered components and wiring may be insufficient. It's usually accomplished by a solvent wash, but this is often too cursory for heavy deposits. Excess flux degrades after many heat cycles, may hydrolyse [I]inter alia[/I] and may become conductive. Anyone spending (far too much) cash on their prized electronics would be well-advised...Leave a comment:
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Re: FSP400-60GLN worth fixing?
"At the next power cycle it suddenly turned on and started working. "
Had almost identical experiences as var123, changes of caps, etc., but as reported above, +3, & +/-12 lines couldn't support sensible loading - only +5V fully functional. So far unable to locate what seems to be a single fault location.
"SMD resistors and diodes mentioned in this thread seems to be fine"
But, beware: have you looked underneath them all?! Prolonged overheating can char the adhesive spot and give partial (or full, even) sh...Leave a comment:
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Re: FSP400-60GLN worth fixing?
This website. Something like "This website is not secure, etc, etc..."
It overwrites the log-ins which seem to be required every time now.
The pop-up obscures the log-in panel but just keep typing and press <enter>.Leave a comment:
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Re: FSP400-60GLN worth fixing?
Your website is now showing [I]insecure[/I] - message overwriting the U/N, P/W area?!
Well, I did the caps & D's + few R's - SB OK, all lines showing correct V s on o.c.. Is Z41 so mission-critical? Yes, already reported above some sme s had overheated and charred the adhesive spot underneath, probably making them 0R s. Why is my +5V restored to full capacity, but not other lines, esp. with clean transformers? Why is this possible if DM311 controller misbehaving. Still a can o' worms - where to turn next? How do you build in obsolescence...Leave a comment:
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Re: FSP400-60GLN worth fixing?
" they don't do business with "consumers" "
- you mean they won't do business with the SP Corporation?!
- only down side might be minimum quantities, ie can't buy one off 5ohm sme, but anything costing more than ~£2 is usually available in single units.
- but if Bh is marketing caps, problem solved.Leave a comment:
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Re: FSP400-60GLN worth fixing?
Thanks for those comments, Stef. No, much later, around 2012-ish. No sign of the transformers or coils overheating - copper wire and varnish still pristine. All are/were 400W and none overworked.
As for price of caps, best price/delivery for quality stuff is rs-online - operates internationally now, can get a trade a/c with 'free' p&p, next day ail order throughout Europe and antipodes. Used to be a tiny little operation in a London back street (Radiospares)selling war surplus, now massive operation. Cheaper but 1yr warranted from...Last edited by Elitist; 07-30-2017, 12:36 AM.Leave a comment:
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Re: FSP400-60GLN worth fixing?
Many thanks, Bh. My DM311 is a Fairchild Q0170R, labelled M4. FWIW, it looks clean as a whistle no signs of burning/overheating either around (top of board) or SMEs under, although I don't like the way their adhesive dots are discoloured across the entire piece.
My 6800 is a CM6800G lo srt-up current PFC/PWh controller. Had to engage in gymnastics, lights & lenses to read it on daughterboard. Again, looks clean.
Testing these blighters in circuit isn't easy and probably not instructive. Don't have instrumentation to check out-of-circuit....Leave a comment:
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Re: FSP400-60GLN worth fixing?
DM311/Fc270 & 6800 - where are these located, please? Circuit numbers? Can Q12/13/30/31 be adequately tested in circuit (static), power off?Leave a comment:
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Re: FSP400-60GLN worth fixing?
FWIT (I know you guys like your mnemonics - perhaps I should label myself TW*T, choose your own vowel), I have read through all seven pages of thread again. Understood about 50% (not an electronic/electric engineeral, or even an engineer of any sort). Seem to have followed all your best bits of advice, got the 5VSB running, restored all the OPs, got full power on 5V. What puzzles me is, if, all caps & Ds replaced, the amps and volts get that far down the trail how can it just be the 3&12V rails, which are working, fail to provide big amps?...Leave a comment:
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Re: FSP400-60GLN worth fixing?
Indeed! I have a bunch of cheap, simple PSUs - change a couple of caps and they're good for another 3/4yrs. HEC and SCL are favourites, but expensive, complex ones like OCZ contain the same old cheap, faulty caps/components as well as other design shortcomings.
As far as these FSPs are concerned, though, they represent a certain challenge. Clearly, the design is OK, as acknowledged earlier, they run for 2-3yrs - it's the components that are dud. So, change the caps - still not working 100%; what else is failing? Semis? Transformers? Or, maybe,...Leave a comment:
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Re: FSP400-60GLN worth fixing?
Ha! Not to worry, but appreciate it you could tell which one it is for future reference, děkuji.
More testing: As before +5V and +5VSB seem totally robust but 3.3 & 12V lines support 36ohm loads but not 15ohm ditto. Is my logic (sorry about pun) correct that the SB is OK and that the issue lies within the 3/5V rails? If I can pin this down, I'll be able to resurect three units...Last edited by Elitist; 07-22-2017, 07:33 AM.Leave a comment:
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Re: FSP400-60GLN worth fixing?
I think you may have hit on a shortcoming of my usual testing routine? Ever since starting to test (working or not) PSUs many years ago, I have been in the habit of loading the +5V line before switch-on with a 10ohm ww (0.5A) [used to be necessary for some AT supplies which only switched on with a loading . I will now recheck. Yes, SB is rated 2A and didn't go down with a 5ohm load. Rechecked with a 2.2ohm load - SB stays [I]UP[/I]. No change with SB on 2.2ohm load and 10ohm load on +5V rail.
Uh ...where next? and thanks for your continuing interest/offer...Last edited by Elitist; 07-22-2017, 07:15 AM.Leave a comment:
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Re: FSP400-60GLN worth fixing?
Confused - at least two of us!
Oh dear, all gets more convoluted once the drivers & semis get involved! "..go to protection mode." sounds very much like a rational diagnosis here, especially as the whole thing restarts after removal of the load, switch off and restart ~couple of minutes later when all lines come back up. Can you suggest any particular component(s) to inspect in the PWM/driver circuitry? May be worth chasing this explanation down for this unit as I saw very similar effect on one of the earlier failures. (May still...Last edited by Elitist; 07-22-2017, 02:21 AM.Leave a comment:
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