---------- 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 -- 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
