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Lenovo M55 8808 is overheating,please help

IBM or Lenovo Desktops, Workstations, ThinkStations, etc. Recent vintage, hardware/software..
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Rapidrob
Posts: 5
Joined: Sun Mar 10, 2019 7:15 pm
Location: Edgewood,New Mexico

Lenovo M55 8808 is overheating,please help

#1 Post by Rapidrob » Sun Mar 10, 2019 7:33 pm

Yes I know it's old. It is a back-up computer in the advent my primary computer goes down. The Lenovo cost me nothing.
The computer is a 2007 Lenovo M55 8808 running Unbuntu.
For some reasons the fans turn on at boot,but do not ever speed up even though the graphics chip and heat sink get so hot the system reboots itself unless I use an outside fan to blow air into the case and over the heat sink. When I do that,it never overheats and the computer stays on. It is not convenient.
Just for giggles I moved the fan/case sensor from the front of the computer to the heat sink of the graphics chip. Nothing has changed.The fans never speed up.
Is there a way to check the sensor to see if it is working?
Can the pins for the sensor's cable plug be tricked into thinking the case is really hot and turn the fans on high? If so,which pins are used? I'd hate to short out and blow up the board.
The thermal compound has been cleaned off and replaced with a quality compound for the graphics chip. It did not help.
The CPU never overheats.
Any helpful ideas are appreciated.

axur-delmeria
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Re: Lenovo M55 8808 is overheating,please help

#2 Post by axur-delmeria » Sun Mar 10, 2019 11:51 pm

Check the BIOS settings first. Perhaps there's a setting that allows manually setting the fans speed.
Daily driver: X220 4291-C91 i7-2620M

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Rapidrob
Posts: 5
Joined: Sun Mar 10, 2019 7:15 pm
Location: Edgewood,New Mexico

Re: Lenovo M55 8808 is overheating,please help

#3 Post by Rapidrob » Mon Mar 11, 2019 9:11 am

I set BIOS fan setting is set to "High".

Rapidrob
Posts: 5
Joined: Sun Mar 10, 2019 7:15 pm
Location: Edgewood,New Mexico

Re: Lenovo M55 8808 is overheating,please help

#4 Post by Rapidrob » Mon Mar 11, 2019 10:40 am

I remembered that I have an electronics heat testing device that pin point heats components to test for failure/operation.
The "air temp" sensor dose in fact work. Why it is in front of the CPU on a stalk is beyond me as it serves no function on the GPU heat sensing.
I could move it to the heat sink of the GPU to see if that helps with keeping the heat down?
I did notice that if I plug in the PCI Trinidad Riser Card and a WI-FI card into the motherboard the GPU gets so hot in a few minutes that the computer shuts down reboots.
I tried a diff WI-FI card and it did not help. Instant "too hot" as in you cannot touch the GPU heat-sink cooler.
Could the Trinidad Riser Card with is caps be the bad?
There is no troubleshooting this computer on the web that I can find.
Any of you Techs have an idea what to check next?

Rapidrob
Posts: 5
Joined: Sun Mar 10, 2019 7:15 pm
Location: Edgewood,New Mexico

Re: Lenovo M55 8808 is overheating,please help

#5 Post by Rapidrob » Mon Mar 11, 2019 12:53 pm

When the computer is up and running the GPU is reading 151F / 66C. The cooling fans are turning a few hundred RPM. If I stress test the computer the unit will reboot several times.
I installed a 2" square 12 VDC fan on top of the GPU heat sink and the temp dropped to 94F / 34.8C. A lot better.
I still need help on the Riser Board and WI-FI. It now,when plugged in, won't allow the computer to boot properly,failing right after Post.
Please help if you have any ideas?

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