Re: [Thinkpad] Is there a fan test before opening case? It's open now.
No TP fan control or other fan control installed. No dust - the fan blades are
clean, the internals look new (the sys board was just replaced with a reflowed
R50, which was working fine up to now). The fan spins freely by hand, of course
I'll bet the little bearing doesn't like too much of that (finger pressure).
I removed the palm rest, then removed and reseated the fan power connector. It
was seated fine to begin with, and reseated exactly as it had been before.
Next I powered on with the keyboard loose, allowing me to see / hear the fan
spin up. It's normal during resume from hibernate.
But not for long. I set full clock speed ("high system performance") in batt
max (am running on bat) and the fan stayed off until 63c, which is also when I
lifted the keyboard to take a look. The fan now believes its job is done and
has halted - zero fan speed. Temp was climbing about a degree C every 5 seconds
- roughly. CPU load is very low, about 15%. There - it clicked on at 62c again
without my disturbing it, and halts dead once it reaches 53. Now, without any
interruption, it's halted at 0 rpm, lets temp float to 62, pulls it down to 49,
dowshifts and is still running at a lower rpm. Temp is floating downward now,
though unevenly, with constant fan rpm until 43c at which point it cuts out,
letting the temp float back up. Now it's kicked on at 49 and still pulling down
to 35c cpu temp.
Obviously this is programmatic, though not keyed only to cpu temp - something
in the BIOS perhaps. It is quieter - the fan is hardly running and could
probably stay off with a light heat load.
This is an R50 main board now, so it comes with a different bios. But I've been
using it for a few weeks and have not seen the no-fan issue until today.
Huh. If this is not a risk to the machine it seems preferable to the original
fan regime - fan is off much of the time and runs at lower rpm otherwise. This
is probably also a cooler running board, it has 1/2 the video ram of the p
series it replaced.
If I seem a little paranoid it's due to the multiple sys boards the machine has
consumed over the years, the last one due to case flexing. Then again, it's
waaay past the normal 3 yr cycle for a notebook. There's definitely a more
sturdy machine in the near future.
>________________________________
> From: "[email protected]" <[email protected]>
>To: [email protected]; [email protected]
>Sent: Thursday, December 15, 2011 8:03 PM
>Subject: Re: [Thinkpad] Is there a fan test before opening case?
>
>
>Do you have ThinkPad Fan Control installed?
>
>Cheers,
>
>George
>
>
>
>
>
>
>
-----Original Message-----
>From: Laurence <[email protected]>
>To: thinkpad <[email protected]>
>Sent: Thu, Dec 15, 2011 6:10 pm
>Subject: [Thinkpad] Is there a fan test before opening case?
>
>
>
>
>
>
>I just noticed that there's no fan activity on my thinkpad, and idle temps are
>10-15c higher than they should be. Oddly, I'm having no problem using the
>machine, the cpu climbs rapidly but has not exceeded 60c, though this is with
>light use. The fan is about a year old.
>I won't have a chance to open it up for a look for several hours ...
>it's a T40, now with a "Dothan" 2.0mhz cpu
>
>And now the fan just kicked on, leading to a temp drop, though it's about 8c
>higher than expected for the conditions. So I'll have to open it up and take
>a
>look: what should I look for? No clean, truly secure workspace will be
>available so few small parts can be pulled and I can't leave it disassembled.
>
>thanks...
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