DA0U92MB6D0 REV:D NO POWER

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  • NConstantinou
    Badcaps Veteran
    • May 2017
    • 342
    • Cyprus
    #1

    DA0U92MB6D0 REV:D NO POWER

    Dear all,

    i have the above board and on PQ21(M3016D) i have input but no output. Therefore i have no input on PR7.
    i do not have similar transistor to substitute. how can i overcome this!
    Thanks
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14424
      • Canada
      #2
      Remove all power. Meter in resistance mode. Measure the resistance to ground on pin #3 = PR7 = main power rail. What is the exact resistance? If it is too low, there is a fault on the main power rail.

      Connect the power adapter. Measure the voltage to ground on the gate pin # 1 on PQ21. Checking the gate voltage for this mosfet which should be higher than the voltage being passed between source / drain pins to fully enable. Gate pin should be ~25v to enable.

      If not, confirm the voltage to ground of REGN pin # 16 which should be ~6v.

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