June 2021 eLog


Author: Massimo

  • Performed a visual inspection with Nancy's microscope of all the components on the board, no apparent signs of broken pieces (cracks, burns...)
  • Talked to Leonardo, neither he nor Francesco L. have any better idea of what could have possibly failed; they'll try to find a spare board, re-program the FPGA and send it to us


Author: Massimo with support from Ray

  • We replaced the ADP3338 again, but there still is a short between Vout (which should be 3.3V) and ground. We then removed the ADP3338 and checked (short still there) the first immediate components downstream of the 3.3V
    • FC06
    • U3
    • FC01
  • Nothing helped
  • Asked Francesco L. for extra ideas and otherwise for spare board


Author: Massimo

  • Replaced U6 with new ADP3338; the power supply immediately reaches compliance, lowering voltage from input 5V to 2V roughly. Also, ADP338 immediately starts heating up, there is still a short somewhere. Check capacitors FC05/6?

-- Massimo Capasso - 2021-06-08


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Topic revision: r3 - 2021-06-10 - MassimoCapasso
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