[GLLUG] Recommendations for computer repair in North London

Chris Bell chrisbell at chrisbell.org.uk
Fri Feb 5 21:39:35 UTC 2016

On Friday 05 Feb 2016 21:11:20 Adrian McMenamin wrote:
> On 5 February 2016 at 20:49, Chris Bell <chrisbell at chrisbell.org.uk> wrote:
> > Does the fan seize up / need oil? Sleeve bearings dry out but can be
> > oiled by peeling the label, removing any rubber plug, and dropping some
> > clean oil in before replacing the label. It requires a good quality
> > light oil that can stand increased temperatures without getting sticky,
> > I have used vehicle ATF and Castrol HiSpin.
> > 
> > Is the heat sink blocked below the fan body? The fan is usually held on
> > the heat sink with 4 screws. Fresh heat transfer compound will be
> > required if the heatsink is moved.
> > 
> > Is the fan power connector the correct way round? Most (but not all)
> > motherboards have the same connections, and are often marked.
> > 
> > 
> > 
> > Chris Bell
> It's not my computer, I don't have it and I have no means of testing it
> further. So I know you are trying to be helpful, but what I really need is
> a recommendation of someone to look at it.
> FWIW though - the connector is on correctly (at least it was when I looked
> at it) and the heat sink is on correctly.
> The box will run for about 15 minutes if cold, then the fan stops and
> shortly after it shuts down completely because of (I assume) overheating.
> If booted warm then this can all take place much more quickly.

Another common problem is heat transfer compound patchy or dried out. There 
can be air gaps unless it is piled in the middle and allowed to spread as the 
heat sink is clamped in place.
I have found very few faulty fans that will start normally but then fail 
unless the bearing is dry.
These are easy checks that cost a little time but very little money. Just 
remove the mains power cable first. If you are worried about static 
electricity damage, prefer cotton clothing, and touch the metal case first.

Chris Bell
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