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Fault Finding - temperature dependant fault.

Discussion in 'Electronic Design' started by steve, Aug 3, 2004.

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  1. steve

    steve Guest

    Repairing production failures of pcbs.
    Description - PIC controls relays. At switch on, PIC software
    initialzes relays and monitors, if on/off.

    Passed in the morning.
    Failed in the afternoon.

    Gently heated board with warm air. - Failed
    Cooled down - Pass.

    Gently heated different parts of board with warm air - Failed
    Cooled down - Pass.

    Cant believe its dry joints at this temp.

    Ideas?
     
  2. Don Pearce

    Don Pearce Guest

    I'll take on that bet. Get the board warm enough to fail, then use a
    freezer spray to locate the part that makes it work again.

    d

    Pearce Consulting
    http://www.pearce.uk.com
     
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