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    Stamp-S3 randomly starts drawing 500mA.

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    • BramB
      Bram
      last edited by

      My Stamp-S3 seems to work fine, but regularly starts to suddenly draw 500mA for no apparent reason.

      This makes the unit too hot to touch.

      Even if I disconnect ALL pins, it still keeps drawing 500mA from the USB port.
      Only after unplugging, and reconnecting to USB, the powerdraw goes back to normal, at 10mA or so.

      Has anyone else seen the Stamp-S3 turn extremely hot at random times?

      M 1 Reply Last reply Reply Quote 0
      • M
        mtylerjr @Bram
        last edited by mtylerjr

        @bram Did you self-solder connectors and pins?

        Ive seen this a few times with tiny solder bridges to vcc or gnd that varied when they heated up/cooled down and acted exactly that way. (Or similarly when I took too long soldering pins, and damaged an internal component from the heat of the pin/solder pad)

        BramB 2 Replies Last reply Reply Quote 2
        • BramB
          Bram @mtylerjr
          last edited by

          @mtylerjr Yes, I soldered the 2.54mm headers. I will check them again under my microscope.

          I also see a weird 4.6V on EN pin, whereas the VCC is a perfect 3.30V and the power is a 5.01V.

          1 Reply Last reply Reply Quote 0
          • BramB
            Bram @mtylerjr
            last edited by Bram

            @mtylerjr Thank you for that great diagnosis!

            I checked, and yes, I had a short.

            I fixed it, and hopefully I will not see the 0.5A power draw any more. I still have the 4.6V on EN pin, though, which I think is weird.

            short

            teastainT 1 Reply Last reply Reply Quote 1
            • teastainT
              teastain @Bram
              last edited by

              @bram The EN is the Reset input and is pulled up normally, and brought down to reset the ESP.
              While it does seem odd that it is 5V, mine does the same thing!
              My (ahem) LilyGO T-Display S3 Reset pin is at 3.3, which makes more sense.
              -Terry

              Cheers, Terry!

              100% M5Stack addict with several drawers full of product!

              1 Reply Last reply Reply Quote 1
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