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820-00138 turns on, battery error symbol, then turns off. Works fine in SMC bypass

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  • #16
    Ok so I did a nice reball on a new SMC and green light is back BUT it doesn't boot in bypass mode.

    faulty SMC?

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    • #17
      Did you get it from same model donor board?
      Machine should start in SMC bypass, as before.
      Something went wrong in the process, or SMC is bad/incorrect.
      Also check SMC_AVREF voltage.

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      • #18
        Actually, it wasn't from the same model donor. the chip has the same markings. I guess you're going to tell me now that the programming is different hahaha

        I can't find SMC_AVREF in the schematic or board view

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        • #19
          "I can't find SMC_AVREF"
          PP3V3_S5_AVREF_SMC to be more specific.

          "I guess you're going to tell me now that the programming is different"
          Exactly!!!

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          • #20
            Hi there! Revisiting this today. Bought donor board and have reablled SMC from a 820-00138-a board but I noticed the board i'm repairing is 820-00138-05

            have tested that SMC and while I get the orange / green light and while the light turns screen when i try SMC bypass, it's not doing anything more than that

            Will these SMC's work?

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            • #21
              SMC is compatible, but you can't be 100% sure got a good one from scrap board...

              Check again basic signals.
              Be sure SMC is properly soldered; check for moved, or knocked off components.

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              • #22
                ok will check soon thanks!

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                • #23
                  tried another SMC, dead only charging light comes on. interestingly when i press the power button the light goes from orange to green then back to orange
                  gonna check voltages now

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                  • #24
                    The keyboard is resetting the SMC....does it turn on with the keyboard and trackpad disconnected????

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                    • #25
                      Check the board alone on the desk, without any perypheral.
                      If works, then start to connect things one by one...

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