Thinkpad T21 fan problem

Archived from groups: comp.sys.laptops (More info?)

Hi,

I have T21 and the fan doesn't blow. System works but crash after a while
becouse of heat. Fan newer start spinning. I took it off and tested on power
supply that the fan itself is functional and it starts spinnig. So the
problem is either on bios or system board fan control unit.

Does anyone have a glue how to check and fix the problem. I was thinking to
put straight 5v to fan and let it blow all a time put after all thats not so
professional way to fix this as I want.

Is it possible that bios is somehow messed up and just don't start the fan?
how to chek this? also one way of thinking is that parts which measure
temperature on system board is not functional. Does Thinkpad use CPUs
internal temp sensor or does it have one on system board near CPU? Any idea
how to check this? There are no temp visible on bios, right?

Anyone knows where the FET's or transistors for fan powering exist?

Thanks!

-jAri
4 answers Last reply
More about thinkpad problem
  1. Archived from groups: comp.sys.laptops (More info?)

    When the T20's came out there was a BIOS problem that caused overheating...IBM
    issued a new BIOS. Check the new T-21 BIOS loads and see if any mention the
    issue in the txt file.


    On Thu, 23 Sep 2004 07:16:04 GMT, "Jari Heikkil?"
    <jari.p.heikkila@POISTATAMAtut.fi> wrote:

    >Hi,
    >
    >I have T21 and the fan doesn't blow. System works but crash after a while
    >becouse of heat. Fan newer start spinning. I took it off and tested on power
    >supply that the fan itself is functional and it starts spinnig. So the
    >problem is either on bios or system board fan control unit.
    >
    >Does anyone have a glue how to check and fix the problem. I was thinking to
    >put straight 5v to fan and let it blow all a time put after all thats not so
    >professional way to fix this as I want.
    >
    >Is it possible that bios is somehow messed up and just don't start the fan?
    >how to chek this? also one way of thinking is that parts which measure
    >temperature on system board is not functional. Does Thinkpad use CPUs
    >internal temp sensor or does it have one on system board near CPU? Any idea
    >how to check this? There are no temp visible on bios, right?
    >
    >Anyone knows where the FET's or transistors for fan powering exist?
    >
    >Thanks!
    >
    >-jAri
    >
  2. Archived from groups: comp.sys.laptops (More info?)

    Change the CMOS battery.
    "Mark" <NOSPAM@sospam.com> wrote in message
    news:u2k5l0pdkevq7vjsnepcn41rcski6icdef@4ax.com...
    > When the T20's came out there was a BIOS problem that caused
    overheating...IBM
    > issued a new BIOS. Check the new T-21 BIOS loads and see if any mention
    the
    > issue in the txt file.
    >
    >
    >
    >
    >
    >
    >
    > On Thu, 23 Sep 2004 07:16:04 GMT, "Jari Heikkil?"
    > <jari.p.heikkila@POISTATAMAtut.fi> wrote:
    >
    > >Hi,
    > >
    > >I have T21 and the fan doesn't blow. System works but crash after a while
    > >becouse of heat. Fan newer start spinning. I took it off and tested on
    power
    > >supply that the fan itself is functional and it starts spinnig. So the
    > >problem is either on bios or system board fan control unit.
    > >
    > >Does anyone have a glue how to check and fix the problem. I was thinking
    to
    > >put straight 5v to fan and let it blow all a time put after all thats not
    so
    > >professional way to fix this as I want.
    > >
    > >Is it possible that bios is somehow messed up and just don't start the
    fan?
    > >how to chek this? also one way of thinking is that parts which measure
    > >temperature on system board is not functional. Does Thinkpad use CPUs
    > >internal temp sensor or does it have one on system board near CPU? Any
    idea
    > >how to check this? There are no temp visible on bios, right?
    > >
    > >Anyone knows where the FET's or transistors for fan powering exist?
    > >
    > >Thanks!
    > >
    > >-jAri
    > >
    >
  3. Archived from groups: comp.sys.laptops (More info?)

    I have second newest bios on. (1.15 - KZET33WW). But becouse fan newer spin
    i think this is more hardware issue.

    -jAri

    "Mark" <NOSPAM@sospam.com> wrote in message
    news:u2k5l0pdkevq7vjsnepcn41rcski6icdef@4ax.com...
    > When the T20's came out there was a BIOS problem that caused
    overheating...IBM
    > issued a new BIOS. Check the new T-21 BIOS loads and see if any mention
    the
    > issue in the txt file.
    >
  4. Archived from groups: comp.sys.laptops (More info?)

    Well if that battery would be empty the bios should inform or give some
    other errors, right? the system work fine only fan doesn't spin and after a
    while CPU over heats and crach... nothing to do with CMOS battery, right?

    -jAri

    "Bruce Markowitz" <scosgt@worldnet.att.net> wrote in message
    news:2rh54hF19hq7iU1@uni-berlin.de...
    > Change the CMOS battery.
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