testing for a failed MOSFET

Discussion in 'General Electronics Chat' started by jobertgalea, Feb 7, 2009.

  1. jobertgalea

    Thread Starter Member

    Nov 27, 2008
    I need to know how can I test and identify if a MOSFET has failed or not due to high soldering temperatures. What can I do please, using just a simple multimeter? Thank you.
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    You should be able to read a diode junction from drain to source. The diode will be reversed biased in normal operation. All other terminals should check open.

    Do the check on a FET in a known good board so you have some idea of what readings to expect. Checking in circuit is always less clear than out of circuit because of alternative current paths.