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Troubleshooting computers

Discussion in 'Electronic Repair' started by Brian O, Mar 9, 2007.

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  1. Brian O

    Brian O Guest

    I have a good background in electronics and troubleshooting, but need
    some help in how to troubleshoot microprocessor circuits/ computers. Are
    there any techniques that help to determine if a processor circuit is
    working properly other than just running it, and if there is no
    troubleshooting software for it? Is it just a matter of checking to see if
    data is moving? How can you tell the data is correct? Any help in
    troubleshooting these types of circuits is appreciated. Thanks.
  2. Mostly it is done by board/module swapping.

    Steps that can be used (but not often used as a scope is often required):

    1/ Check all supply voltages
    2/ Verify the clock signal
    3/ Verify all inputs
    4/ Verify activity on the busses
  3. You pretty much can't. Most computer shops don't even own a DMM.
  4. KenB123

    KenB123 Guest

    I have a related question: how would you troubleshoot a motherboard which
    resets CMOS to default every time a/c power is shut off, even with a fresh

    I have another identical board (ECS N2U400-A ver1.0) which functions just
    fine, and thought about
    doing an A-B type comparison with a meter, but I'm not sure what to look
  5. Bad CMOS ram or bad battery connection. How much current does it draw from
    the battery while off?
  6. KenB123

    KenB123 Guest

    I haven't yet got to the point of measuring current drain, but the battery
    seems to be holding at 3v.

    However when this problem first cropped up, the original battery was weak.
    So maybe there is a drain somewhere.
  7. Voltage is only useful diagnostically on the CMOS chip. Current is a quick
    and dirty check.
  8. CJT

    CJT Guest

    If you can measure that, you've got a d*mned good meter.
  9. CJT

    CJT Guest

    Methinks you know not of what you speak.
  10. Brian O

    Brian O Guest

    That was pretty much my line of thinking. Sometimes the "boss" doesn't
    understand that though. Thanks.
  11. JW

    JW Guest

    Bad jumper plug for reset CMOS function?
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