Re: What is likely cause of overheating CPU
- From: saturnlee@xxxxxxxxx
- Date: Wed, 24 Oct 2007 21:30:50 -0700
On Oct 14, 10:37 pm, Graham <noth...@xxxxxxxxxx> wrote:
This is a continuation of the thread "Freeze-ups. Is power supply the
only remaining possibility?"
At this point I'm seriously considering replacing either the
motherboard or the CPU or both.
To summarize:
I acqired this computer with an unknown problem. The symptoms began
with persistent and almost immediate system freezes. This would happen
with any sort of high level activity, for example installing Windows
or runnning Windows. The motherboard had 2 visibly damaged capacitors
which I replaced. This made a major improvement, to the extent that I
thought it was "fixed". I later replaced the third cap in that
cluster.
The freezes returned but now usually take several hours to occur. I
didn't start monitoring the CPU temperature until after these freezes.
The reported CPU temp is consistently 30-40C in BIOS setup and 69-72C
in Windows. I was skeptical of these numbers but I think they may be
accurate. I ran for several minutes with the CPU fan unplugged and the
temp slowly rose from 70 to 92C. During that time the CPU was seen to
throttle back to about 56%. I also (with the fan running) aimed a hair
dryer at the heatsink and saw the temp rise from 70-74C with the fan
increasing rpm from the usual 3000 to 4500. I stopped the hair dryer
and the temp dropped to 70 with the fan coming back to 3000 rpm.
I have also replaced the heatsink/fan.
So, if something is causing the freezes and perhaps as a side effect
is also causing the overheating, would that fault likely lie with the
CPU or on some component of the motherboard?
I have tested the power supply with a multimeter while the computer is
under heavy load and the voltages are well within tolerance. I have
swapped out the RAM and hard drives.
No hardware conflicts reported in Device Manager, nothing obvious in
Event Logs, although I'm honestly not sure what to look for.
System:
Asrock M266A motherboard
Celeron 2.4
512 MB DDR
Thanks,
Graham
IF i remember correctly, there are 4 green KZG capacitor at the west
side of the board(next to mosfet), 4 brown KZE at the north side of
the board.
When replacing the caps at VRM, i will replace all . I will use
panasonic FM since it has lowest esr(lower than FC, Chemicon KZE and
KZG)
I am just curious what cap you use.
I have the same board before, the temp monitor is kind of off the
scale. So i just use my finger to feel whether the mosfets and caps
are hot or not when running prime95.
The CPU voltage can be measured at the east side of the inductor(if i
remember correctly, it is either the southest coil or middle one)
The lowest voltage at the one of the inductor is the cpu voltage
.
- References:
- What is likely cause of overheating CPU
- From: Graham
- What is likely cause of overheating CPU
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