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Can you identify this component

Discussion in 'Electronic Components' started by BigBadger, Jul 30, 2004.

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  1. BigBadger

    BigBadger Guest

    I have a Asus dual cpu motherboard on which one of the CPU sockets does not
    work. On examination I've found a surface mounted component near the fauly
    socket that has been damaged during removal or installation of the CPU
    heatsink.

    the component is rectangular and black and is marked 34 08, next to the
    component the PCB is marked D3.

    If you follow this link you will see a photo of the damaged component:
    http://mysite.wanadoo-members.co.uk/abz_piper/component.JPG

    Can anybody advise what this component is and what the rating is?

    thank you
     
  2. Graham W

    Graham W Guest

    Are you really sure it hasn't exploded? There's a splash of solder
    on the solder resist which is a clue that something got very hot?
    It is a diode and may be a part of the voltage regulator for the CPU.
    Can you get a better picture of the big black one nearby with the stubby
    non-connected middle leg?
     
  3. BigBadger

    BigBadger Guest

    --
    *****Replace 'NOSPAM' with 'btinternet' in the reply address*****
    I can tell you what is marked on the MOSFET, this: 10N03L I049

    By the way, yes I'm 99% sure that ot's mechanical damage, ther is no sign of
    the component exploding and it is positioned right where the screwdriver
    goes in the heatsink clip. Plus the owner of the board (not me) has a
    history of this sort of thing, in fact I've just spotted another component
    with similar damage, marked L24 on the pcb, this is a smaller component,
    looks very like a SMT resistor.
     
  4. Diode .
     
  5. Hi,

    It is obviously a diode (marked D3) and IF the characters on
    it are the actual device number, then it is a 1N3408, 33V, 500mW
    zener.


    Cheers - Joe
     
  6. BigBadger

    BigBadger Guest

    *****Replace 'NOSPAM' with 'btinternet' in the reply address*****
    Thank you Joe
     
  7. What would a 33-volt Zener be doing on a PC motherboard whose highest
    incoming supply voltage is 12 volts?
     
  8. Eugen T

    Eugen T Guest

    L24? L usually stands for inductor.
     
  9. BigBadger

    BigBadger Guest

    thanks... any way to find the rating? There is no marking on it I can see
     
  10. Daniel Rudy

    Daniel Rudy Guest

    And somewhere around the time of 07/30/2004 14:59, the world stopped and
    listened as BigBadger contributed the following to humanity:
    It's a SMD Diode.
     
  11. Daniel Rudy

    Daniel Rudy Guest

    And somewhere around the time of 07/30/2004 14:59, the world stopped and
    listened as BigBadger contributed the following to humanity:
    It's a SMD diode. Looks like it's part of the switching supply for the
    CPU's V-Core considering the very nearby MOSFET.
     
  12. Franc Zabkar

    Franc Zabkar Guest

    The MOSFET is an N-channel, logic level, low Rds(on) device with a
    30V, 73A rating:
    http://www.infineon.com/cmc_upload/documents/058/486/IPP_B_10N03L.pdf

    Its circuit symbol shows an internal 30V (?) zener diode connected
    between drain and source. This inverse diode's continuous
    forward current rating is 73A. The external diode, D3, appears to be
    connected in parallel with this internal diode. I wonder why it is
    there at all?


    - Franc Zabkar
     
  13. Hi,

    Even I realised the disparity in voltages.

    Please note my use of capitals on the word 'IF'.


    Cheers - Joe
     
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