fan trouble

lorenz · **Posted:** Mon Jul 30, 2007 2:59 pm

i have disassembled my powerbook 12" 867mhz and i've changed the superdrive. After re-assembling the fan go on when i switch on the computer, run constantly until i shut down the powerbook. I have no idea...maybe is a logic board failure?

powerbookmedic · **Joined:** Mon Feb 24, 2003 1:58 am **Posts:** 944

We've seen this issue several times, and it could be a few things. You need to go back into the unit and reseat the fan and logic board, and make sure the heat sinc makes good contact with the processor. If that doesn't work, you need to put thermal paste on heat sinc where it contacts the processor. One of these tricks should fix you up.

-Bradley
Powerbook Medic

lorenz · **Posted:** Fri Aug 03, 2007 5:01 am

Thanks very much for your advice. I try this way before replace the entire logic board.
The strange thing is that the fun starts at the touch of the power botton, before the startup of the operating system...

powerbookmedic · **Joined:** Mon Feb 24, 2003 1:58 am **Posts:** 944

Try some thermal paste, the odds are good it will fix your problem.

-Bradley
Powerbook Medic

lorenz · **Posted:** Tue Aug 14, 2007 8:45 am

i have put new thermal paste between the processor and the heat sinc, i have reassembled the powerbook but the fan still run constantly...maybe i have to change the logic board? Thanks again.

justin-pbmedic · **Joined:** Thu Feb 27, 2003 6:35 am **Posts:** 1016

it does sound like it is going to be a bad logic board.

fan trouble

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