IBM T40 cpu fan error after reflow

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  • s_henya
    Badcaps Veteran
    • Jan 2011
    • 480
    • Israel
    #1

    IBM T40 cpu fan error after reflow

    Hey,

    Got this laptop, the previous owner had a no video problem,
    So he gave it for repair,
    The tech told him he baked the motherboard in the oven for 10min at 200 derees celsius.

    The no video was solved but then came up fan error problem,

    The client gave up and sold it to me cheap for 30$

    Tested and saw the fan voltages alternating from 5v to 3v every few secs.

    Do you think its worth reparing or ordering a used board for 60$

    already found 2 bad caps, n3p 100 16v had high ESR, replaced them both but with no change.

    any ideas what could be the problem?
    Tags: None
    • dj_ricoh
      Badcaps Legend
      • Jan 2013
      • 2073
      • uk
      #2
      Re: IBM T40 cpu fan error after reflow

      you got there 3 wires
      yes?
      5v 3.3v ground
      3.3v=100% for 20% = some V

      if you can tell us what voltage you got on the wires will nice.
      like fan pins.
      Just cook it! It's already broken.

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