Component Identification Request

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  • LDSisHere
    Badcaps Veteran
    • May 2012
    • 727
    • U.S.A.

    #1

    Component Identification Request

    Hello,

    I am trying to revive a Seagate hard drive and I am having trouble identifying a part on the board. The component I need help with has a red arrow pointing at it in the first picture. The second picture is of the whole board for reference.

    I am thinking the component is a diode, but with no silkscreen and it being white I am in doubt. Any help in this matter would be very much appreciated.

    Thanks!
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  • SteveNielsen
    Retired Tech
    • Jun 2012
    • 2327
    • USA

    #2
    Re: Component Identification Request

    I am guessing that it is a zener diode from the BZ marking but without the the number can't guess the specifics about it.

    Comment

    • redwire
      Badcaps Legend
      • Dec 2010
      • 3900
      • Canada

      #3
      Re: Component Identification Request

      The white ceramic, odd ball size (not 1206) and non-symmetrical end leads make it a strange part. My guess is a SMD chip fuse. I tried looking at Littelfuse, Bourns but nothing is an exact match.

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: Component Identification Request

        What resistance reading do you get when using Ohm mode, in Diode mode?
        Never stop learning
        Basic LCD TV and Monitor troubleshooting guides.
        http://www.badcaps.net/forum/showthr...956#post305956

        Voltage Regulator (LDO) testing:
        http://www.badcaps.net/forum/showthr...999#post300999

        Inverter testing using old CFL:
        http://www.badcaps.net/forum/showthr...er+testing+cfl

        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
        http://s807.photobucket.com/user/budm/library/

        TV Factory reset codes listing:
        http://www.badcaps.net/forum/showthread.php?t=24809

        Comment

        • stj
          Great Sage 齊天大聖
          • Dec 2009
          • 30906
          • Albion

          #5
          Re: Component Identification Request

          it's a crystal or resonator.
          atleast it looks like one - trace the connections.

          Comment

          • noppa
            Member
            • Feb 2010
            • 41

            #6
            Re: Component Identification Request

            It's a Shock Sensor.

            What's the problem with your HD?

            Comment

            • redwire
              Badcaps Legend
              • Dec 2010
              • 3900
              • Canada

              #7
              Re: Component Identification Request

              Wow I was totally wrong about that part. My HDD knows when I bump it... It seems to be a muRata (Piezotite) shock sensor (pdf), they generate ~1-2mV/G.

              That HDD pcb has a lot of black vias and others gold. A problem with oxidization and corrosion?

              Comment

              • LDSisHere
                Badcaps Veteran
                • May 2012
                • 727
                • U.S.A.

                #8
                Re: Component Identification Request

                Noppa, after much Google searching I found some information agreeing with your conclusion that the part in question is a shock sensor.

                I do not recall my meter readings when probing this part, however when I was checking for unusual shorts and opens this part did not read like a diode so I wanted to know what it was if not a diode.

                As far as the drive goes, it stopped spinning. The motor windings test good but the board is not putting out a square wave to drive it, just a flat 6.xxV. (Checked with my scope.) The main (biggest) chip gets quite warm pretty fast also, way more so than the Seagate drive I was using for comparison purposes.

                The drives owner agreed to try a donor board, so I found one that came off an identical drive that was made at nearly the same time. Once it arrives I will of course move the EEPROM from the original board to the donor board before attempting to test it.

                I want to say thanks to everyone for their input and trying to help identify the mystery part. I know I have learned something new and hopefully I am not the only one. Surface mount parts can be a real pain to identify so I like it when I can add information like this to my internal inventory.

                I will report back it the donor board swap was successful or not, as I understand there is a good chance it will fail.

                Comment

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