CPU A & B overheat
Someone brought in that MP 2,1(1186) ,2007; S/N:157192LMUPZ, that was shutting down randomly. The diagnose LEDs on the logic board say: CPU A&B overheat.
I took it apart, released it from that disgusting melange of nicotine and dust, gave it a fair layer of thermal compound.
Now the thing just reboots randomly, even in idle and the LEDs still say : overheat, although all fans are working.
Note: He bought it ' hacked '; its running Mavericks on a 256 GB SSD, with a ATI Radeon HD 8770 and it will not boot externally from either SL oder Lion, doesn't even accept target mode.
Scrapyard?
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Apple Mac Pro "Eight Core" 3.0 (2,1) Specs
Identifiers: Mac Pro - BTO/CTO - MacPro2,1 - A1186 - 2138
door mayer
Alexander,
I am experiencing similar random shut downs on my cMP 2,1.
Today I started disassembling it to get to the cpu heatsinks and to apply fresh thermal paste. But the heatsinks won’t come off.
A similar operation with my cMP 5,1 was a very smooth experience, both heatsinks came off easily after unscrewing all 4 screws for each heatsinks.
The ones from my 2,1 seem glued or soldered. Did you run into a similar problem?
I would like to use this occasion to ask if there are any other heatsinks that I could apply fresh thermal paste to them (northbridge, southbridge? No clue here)
Mat
door Matthias Schnabel
Just an update.
I managed to remove both cpu heatsinks (I had to crack them from the cpus with quite some force and it did not feel good at all) and found a way to remove the other two smaller heatsinks (I assume north and southbridge) and to repaste all them chips, too.
The Mac boots fine but the random reboots still occur. Heat of cpus and diodes etc measures ok with the iStat application. Only problem is with some readings of what seems related to memory and RAM and which indicates immediate high and rising temperatures up to 80 within a minute or so after boot.
I will need to do more testing as soon I find more time for it.
door Matthias Schnabel
I'm having the same problem with my MP 2.1 I tried to go through them with dental floss and to heat it with a hair dryer, but nothing worked, I tried twisting and pulling with a bit of force, but also no. I don't have an overheating problem yet though, but wanted to renew the thermal paste. I hope I didn't bend it too much, and that everything works as I put everything back together.
At the end how exactly did you manage to get the heatsinks off?
door Alejandro Martinez
It was really just brute force that I applied to break the heatsinks off the board. The thermal material that made contact between cpu and heatsinks was like super hardened glue or something. I can’t explain if that was the intention from the beginning or if the thermal paste hardened that much over the years. The board bended very much before the sinks broke off. I know, it’s hard to visualise, so much violence…
door Matthias Schnabel
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