On Dec 31, 2009, at 5:37 AM, Mac User #330250 wrote:
---------- Original message ----------
Subject: why is this MDD overheating?
Date: Mittwoch 30 Dezember 2009N
From: Jeffrey Engle <[email protected]>
To: [email protected]
Ok, before I begin, here's the specs.
Dual 1.25 MDD 2gb ram, 200gb, leopard 10.5.8
Last night I pulled the power supply and cleaned it like I've done a
couple times before and reinstalled it. Only this time, the main fan,
which I figured I'd clean too while I was at it, accidentally got put
in backwards (yes, I did that..) well, obviously it didn't take but
about 4 minutes to overheat and smell like burnt plastic and shut
down
(sleep mode).. then I forced a shut down and opened the machine to
find the fan in wrong. Well, here's where it gets interesting... I
flipped the fan around, and powered it up, starts off fine, normal
fan
noise (rpm) then as I watch, istat is telling me a slow increase...
it's climbing, climbing... past 150f... fan kicks up another notch ..
160f sounds like the fan is full throttle at this point... this is
with very little or no load on the CPU (itunes, mail) then I power
down, and figured I'd put a fresh application of thermal grease on
the
processors..... still the same problem/result? how do I get this
back
down to 130f-140f where it was? what possible damage could I have
done
to this poor MDD? your turn... thanks in advance. Jeff
I had got a heavily used MDD Dual 1.0 GHz and found that the fans
where at a
very high speed all the time. Working with the MDD was possible and
I never
had shut-downs. Only in summer, when the ambient temperature was
higher, the
MDD would suddenly put itself out at heavier workloads, I'm certain
due to
overtemperature of the processors.
I then replaced the thermal compound between the processor and the
heat sink.
And this was the solution. The fans suddenly where at lower speeds
all the
time, and the processor core temperatures where lower.
How old is the thermal compound on your processors? Maybe you should
replace
it.
Cheers,
Andreas aka Mac User #330250
Well after all is said and done, I found out what was making the ol'
mdd overheat... that's what happens when the fan doesn't turn. That
really nasty smell was the fan cooking, literally. So now thanks to
fellow lemmers, I have the fans that I need... that's if I didn't cook
something else in the process:-) Jeff
--
You received this message because you are a member of G-Group, a group for
those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs.
The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette
guide is at http://www.lowendmac.com/lists/netiquette.shtml
To post to this group, send email to [email protected]
For more options, visit this group at http://groups.google.com/group/g3-5-list
