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<  Bugs  ~  PSU repair [expired thread]

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EuphoricaL
Posted: Tue Dec 18, 2007 11:24 am Reply with quote
Joined: 14 Apr 2005 Posts: 21 Location: Lancaster
I just repaired my toppys PSU, so hopefully this info might be useful to someone.

My toppys disk was dieing after a few hours, so I pulled the lid of and measured the voltage on the disk molex connector. Both the +5V and +12V lines started around the correct voltage and slowly decreased until the 5V was below 4V and the 12V was below 11V. I then checked the lines coming out of the PSU to the mainboard and this was the same.

So I replaced all the 16V 1000uF capacitors on the PSU which fixed the problem.

I tested the removed capacitors with a meter once i'd removed them, it turned out the damaged one was the one closest to the disk. I still would have replaced them all as they are the same type, and i already had the board out by then.

My toppy has now been happily running since with no disk crashes.
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MikeyP
Posted: Tue Dec 18, 2007 11:55 am Reply with quote
Frequent contributor Joined: 17 Jan 2006 Posts: 4818
surprising seeing as they are supposedly 105 degree caps , KMG must just be one of those crap makes?.

well done anyway - you've done what I was planning to do with a spare duffer I have here but have never got the spare time and besides I didn't need a new psu just yet Laughing Wink

Mines been running for two years and hasn't keeled over yet Very Happy

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EuphoricaL
Posted: Tue Dec 18, 2007 12:04 pm Reply with quote
Joined: 14 Apr 2005 Posts: 21 Location: Lancaster
I don't really blame topfield for the failure, I've been running it for most of the day, every day since April 2005 (Yikes time goes fast!!!).

I wondered if that particular capacitor failed as it was close to the disk where it is probably the hottest.
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MikeyP
Posted: Tue Dec 18, 2007 12:06 pm Reply with quote
Frequent contributor Joined: 17 Jan 2006 Posts: 4818
EuphoricaL wrote:

I wondered if that particular capacitor failed as it was close to the disk where it is probably the hottest.


it's not even in a particularly hot area of the product apart from overall ambient temps of the inside of the product,

might be interesting to see what other people have fitted , so we can see if and when toppy changed? (if they changed at all)

Can you remember what markings were on the old ones?

the duff psu I have here has Sam young/KMGs at locations C23 andC22 (the 5 and 12 caps for the drive closest to the 4way ouput connector for the drive)

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EuphoricaL
Posted: Tue Dec 18, 2007 12:43 pm Reply with quote
Joined: 14 Apr 2005 Posts: 21 Location: Lancaster
The duff one was a brown KMG one. Although as i say i replaced them all.
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MikeyP
Posted: Tue Dec 18, 2007 12:49 pm Reply with quote
Frequent contributor Joined: 17 Jan 2006 Posts: 4818
for 105's I trust ? Wink

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EuphoricaL
Posted: Tue Dec 18, 2007 1:02 pm Reply with quote
Joined: 14 Apr 2005 Posts: 21 Location: Lancaster
yeah Wink, had some lying around from another repair
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Andy K
Posted: Tue Dec 18, 2007 2:28 pm Reply with quote
Frequent contributor Joined: 14 Jun 2005 Posts: 3513
Thanks very much for this invaluable information.

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jumbo
Posted: Tue Dec 18, 2007 6:13 pm Reply with quote
Frequent contributor Joined: 11 Apr 2005 Posts: 4731
This is indeed useful information for those of us who'd like to have a go at "self-repair"; particularly if more people can confirm this to be the root of all PSU woes. Anyone with a dead PSU they don't want Wink

Do Maplin sell the capacitors? Does anyone know a ref/link for the right (or nearest) ones. Is VH50E it? Costs 50p!


Last edited by jumbo on Tue Dec 18, 2007 6:25 pm; edited 2 times in total
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MikeyP
Posted: Tue Dec 18, 2007 6:23 pm Reply with quote
Frequent contributor Joined: 17 Jan 2006 Posts: 4818
jumbo wrote:

Do Maplin sell these? Does anyone know a ref/link for the right (or nearest) ones


do you mean the caps ? as you certainly won't get the PSU from maplins

if it's the caps you're after get some decent (nichicons are my favourites usually) quality (usually gauged by how much you pay for them) radial 1000uF/105degree electrolytics in 16V, 25V or 35V should all physically fit in the spot and be perfectly aok.
(16V as a minimum and 105 degree as a minimum)

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jumbo
Posted: Tue Dec 18, 2007 6:32 pm Reply with quote
Frequent contributor Joined: 11 Apr 2005 Posts: 4731
Thanks for the link. I'm placing an order just in case! Sod's law it'll happen to me during the hols and I'll be stuck. I wonder what Turbosat do with their "dead" PSUs Wink
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MikeyP
Posted: Tue Dec 18, 2007 6:45 pm Reply with quote
Frequent contributor Joined: 17 Jan 2006 Posts: 4818
I'm not so sure you should reply on maplins spec of -408 to 858 degrees c !!!! Laughing Laughing Confused

so you caught that very long rs link I put up for a few seconds Shocked
I had to take it down as it made the thread go widescreen

If you go looking on decent sites just put: 1000uF 35V and 105 in as your search clues on one line it will find them


Last edited by MikeyP on Tue Dec 18, 2007 6:46 pm; edited 1 time in total

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Parts or Repair service for your poorly toppy/PSU - 'talk to me' Smile my name's Mike though, not Terry Tibbs Very Happy
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charley
Posted: Tue Dec 18, 2007 6:46 pm Reply with quote
Frequent contributor Joined: 13 Jul 2005 Posts: 1563 Location: Belfast
This thread would be a useful sticky.

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regards Charley
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MikeyP
Posted: Tue Dec 18, 2007 6:48 pm Reply with quote
Frequent contributor Joined: 17 Jan 2006 Posts: 4818
you should also obviously make sure you put them in the right way round Laughing Wink

the pcb is marked with a bolder arc of the circle to show which is the neg side.

I doubt complete beginners would attempt the job , but it's just in case Very Happy

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www.mpavservice.co.uk
www.mpavservice.co.uk
www.mpavservice.co.uk
Parts or Repair service for your poorly toppy/PSU - 'talk to me' Smile my name's Mike though, not Terry Tibbs Very Happy
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EuphoricaL
Posted: Tue Dec 18, 2007 6:57 pm Reply with quote
Joined: 14 Apr 2005 Posts: 21 Location: Lancaster
I'd like to suggest that before ordering and replacing the capacitors that you check the voltage on the hard disk molex and PSU outputs to see if it exhibits the same behavior, a drop over time.

Because the problem was present on both the 5V and 12V lines I figured the 16V caps where a good place to start and not the smaller caps.
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