I need some help identifying a crystal.

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  • DCJack
    Member
    • Apr 2013
    • 26
    • Canada

    #1

    I need some help identifying a crystal.

    I am trying to fix a friends "bow string weight guage", basically an electronic scale that hooks on to a string. It slipped out of his hand when he was testing a bow and shot it across the room into a wall like an arrow. Everything looked fine but the unit won't turn on now.

    I took the thing apart and can't find any physical damage and all the components pass my DMM sniff test and from past experience I know that crystals can fail due to shock damage much more easily than other electronic components. I'm hoping to replace the crystal and be done with it because if it is the PIC that is damaged then he is screwed because there is no way in hell I am going to be able to get my hands on the programming to make a new one.

    The problem I am having now is that I can't figure out what the crystal is. I Google'd the only markings I could find on it and nothing of worth comes up. I also have no experience with PICs so I can't make any educated guesses as to what it could be. Any help or advice would be appreciated.

    P.S. I have attached pictures of the crystal, board, and the PIC.
    P.P.S. I am getting all the appropriate voltages and am assuming that the PIC is simply not turning on.
    Attached Files
    Last edited by DCJack; 03-19-2016, 02:14 PM. Reason: elaboration
  • stj
    Great Sage 齊天大聖
    • Dec 2009
    • 30979
    • Albion

    #2
    Re: I need some help identifying a crystal.

    4MHz

    Comment

    • DCJack
      Member
      • Apr 2013
      • 26
      • Canada

      #3
      Re: I need some help identifying a crystal.

      Originally posted by stj
      4MHz
      Well that was quick, thanks. How did you figure that out?

      Comment

      • stj
        Great Sage 齊天大聖
        • Dec 2009
        • 30979
        • Albion

        #4
        Re: I need some help identifying a crystal.

        it has a 4, and most low-end pic's are 4MHz

        Comment

        • fzabkar
          Badcaps Veteran
          • Mar 2009
          • 772
          • Australia

          #5
          Re: I need some help identifying a crystal.

          Does the crystal rattle when you shake it?

          FWIW, the PIC16LC925 is rated for frequencies up to 20MHz.

          https://cdn.badcaps-static.com/pdfs/...2576021b1c.pdf

          Comment

          • DCJack
            Member
            • Apr 2013
            • 26
            • Canada

            #6
            Re: I need some help identifying a crystal.

            Originally posted by fzabkar
            Does the crystal rattle when you shake it?

            FWIW, the PIC16LC925 is rated for frequencies up to 20MHz.

            https://cdn.badcaps-static.com/pdfs/...2576021b1c.pdf
            It does not make any noise when I shake it, no.

            Comment

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