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    M5PaperS3 wrong charger -> magic smoke

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    • felmueF
      felmue
      last edited by felmue

      Hi guys

      even though I read the warning about not using certain types of chargers with M5PaperS3 I managed to do so anyways.

      Suffice to say, M5Paper released some magic smoke and wouldn't start anymore.

      I cracked it open from the back (as I think the eInk display is glued in) to get access to the board. (I do not recommend doing that as it is a destructive process.)

      With the eInk display and touch disconnected I started to inspect the board.

      I found the charger IC USB-C protection diode pack being dead from the look of it. I removed the charger IC (as it is not strictly needed to run) I replaced the USB-C protection diode pack and found the MosFet IC getting pretty hot. So I removed the MosFet as well and injected some voltage (4.2 V) after the MosFet which revealed that the 3.3 V regulator took some hit as well. I replaced the 3.3 V regulator with a similar one I took from an M5Atom.

      With two ICs MosFet removed and the 3.3 V regulator replaced M5PaperS3 took a reasonable small amount of current. I also measured ok voltages for the eInk display so I dared to reattach the display and touch screen and yo and behold - M5PaperS3 is alive again.

      Now I need to order some replacement ICs MosFet.

      You can see the opened M5PaperS3 and the dead ICs here.

      Thanks
      Felix

      GPIO translation table M5Stack / M5Core2
      Information about various M5Stack products.
      Code examples

      ajb2k3A 1 Reply Last reply Reply Quote 3
      • ajb2k3A
        ajb2k3 @felmue
        last edited by

        @felmue thanks for taking the time to write up about it

        UIFlow, so easy an adult can learn it!
        If I don't know it, be patient!
        I've ether not learned it or am too drunk to remember it!
        Author of the WIP UIFlow Handbook!
        M5Black, Go, Stick, Core2, and so much more it cant be fit in here!

        felmueF 1 Reply Last reply Reply Quote 1
        • felmueF
          felmue @ajb2k3
          last edited by felmue

          Hi guys

          while I am waiting for the replacement on / off MosFet to arrive I was able to put in a temporary fix - I found a similar MosFet in an old, broken MacBook Pro. :-)

          Thanks
          Felix

          GPIO translation table M5Stack / M5Core2
          Information about various M5Stack products.
          Code examples

          kurikoK 1 Reply Last reply Reply Quote 1
          • kurikoK
            kuriko @felmue
            last edited by

            @felmue
            magic trick!

            Good morning, and welcome to the Black Mesa Transit System.

            felmueF 1 Reply Last reply Reply Quote 0
            • felmueF
              felmue @kuriko
              last edited by

              Hi guys

              Update: M5PaperS3 fully restored and as good as new. :-)

              Thanks
              Felix

              GPIO translation table M5Stack / M5Core2
              Information about various M5Stack products.
              Code examples

              1 Reply Last reply Reply Quote 2
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