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820-00165-A - Turn on, but no chime

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  • 820-00165-A - Turn on, but no chime

    Turn on, but no chime or back light.
    Have light on the mouse

    Where i can start troubleshooting?

  • #2
    Update:

    I just pull out the J6100 and
    Works, but after 1 minute shutdown
    Last edited by menatwork; 11-30-2016, 04:30 PM.

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    • #3
      PPVCC_SO_CPU: 1.8v before shutdown

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      • #4
        Plugged in AC? Shutting down when booted in OSX?

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        • #5
          Yes. When i get the Osx shutdown, also even without system, after 30 seconds shutdown.
          Last edited by menatwork; 11-30-2016, 05:29 PM.

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          • #6
            Corrosion somewhere....

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            • #7
              Just on J6100, but i take off

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              • #8
                Any idea where i can start troubleshooting?

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                • #9
                  Yes, find the corroded resistor or trace, can be anything.

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                  • #10
                    The board is really clean.

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                    • #11
                      Great, look harder, could be under SMC, pin 8 of U1950, whatever.

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                      • #12
                        U1950 Pin 8 3.4v and looks ok, i think.
                        I just re-soldering and right now no more chime, back light and don't shutdown.
                        Last edited by menatwork; 12-01-2016, 05:17 PM.

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                        • #13
                          dukefawks any hint?

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                          • #14
                            Originally posted by menatwork View Post
                            U1950 Pin 8 3.4v and looks ok, i think.
                            I just re-soldering and right now no more chime, back light and don't shutdown.

                            So what changed, you already had no chime and it powered on......

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                            • #15
                              1 - Turn on, but no chime or back light
                              I pull out J6100 and then i get chime, back light and OS, howaver after 30 seconds shutdown.

                              2 - You told me could be under SMC, pin 8 of U1950, whatever.
                              So, i check and re-soldering. But after that, i don't get OS, also chime and back light.

                              Make sense to you?

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