[rescue] Trying to rescue a Sun Ultra 45

[Peter Stokes]

Hi Andrew

Interesting story, not heard of it before, have seen a few mobos with blown
caps (tants?) which did not impact the running of the system. Not from the
same era, but back in the early 90s, I helped out a company who
installed/supported electronic safe locks and they had a large amount of their
controller boards with decoupling caps (20-30 per board) which after time went
'leaky', given they were battery powered, a set of batteries would be used on
standby in less than a week, normally they should last >1 year. Many happy
hour replacing caps....

Peter
---------------------------
Peter Stokes
Ashlyn Computer Services
Tel: 01636 627990
Mbl: 07977 532320
---------------------------



On 14 Jan 2014, at 17:40, Sandwich Maker <adh at an.bradford.ma.us> wrote:

> " From: Peter Stokes <peter at ashlyn.co.uk>
> "
> " Hi Phil
> "
> " Tell us more as not heard of this one.
> "
> "
> " On 14 Jan 2014, at 17:05, Phil Stracchino <phils at caerllewys.net> wrote:
> "
> " > On 01/14/14 11:59, Jonathan Katz wrote:
> " >> http://docs.oracle.com/cd/E19127-01/ultra45.ws/
> " >>
> " >> That may give you a start. The MBs are similar to those in the V240s,
> " >> so any V240 guide may have the same info.
> " >>
> " >> Also, have you tried a serial console at all?
> " >>
> " >> Check for bad caps on the motherboard.
> " >
> " > That.  Sounds a lot like a bad-cap problem, and the age is about right.
>
> outline of the story:
> after a bit o' industrial espionage, a new far-eastern vendor started
> up selling electrolytic caps, cheaper than everyone else, and they got
> a pretty fair amount of business.  but they didn't get the special
> ingredient[s] in the secret sauce, so their caps go bad after a few
> years.  the caps are easy to id, but i've forgotten the details.
>
> my gf's g5 imac fell to this, and apple service, bless their hearts,
> gave her their last replacement mb even though it was past even the
> extended [for this problem] warrantee.  it's still humming, in a
> corner.
> ________________________________________________________________________
> Andrew Hay                                  the genius nature
> internet rambler                            is to see what all have seen
> adh at an.bradford.ma.us                       and think what none thought
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