No power on v1.7 board

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  • March 21, 2023 at 1:16 PM #56775
    Anonymous

      Hi all,

      I just built a v1.7 board, but I’m not reading 5v at the power switch. I tested around the filtering circuitry, and I get 5v all the way up to Q5 (AOSS21115C mosfet) – I read 5v going into it, but I don’t get anything on the drain pin, which would lead to the middle pin on the power switch. I’ve replaced Q5 thinking maybe it was faulty, but I get the same thing. Any ideas on how to diagnose this?

      March 22, 2023 at 11:02 PM #56779
      marqs
      Participant

        Check that Q5 gate voltage is close to zero. If it’s not, check connectivity of Q4 and R58 next.

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