BENQ GW2780-T power board blown

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  • Caspar
    Member
    • Apr 2013
    • 25
    • USA
    #1

    BENQ GW2780-T power board blown

    Hi all, I am looking for some help in ID'ing some parts in an attempt to fix a power supply from a GW2780-T monitor. The power supply PN is 715G7300-P02-006-0V3R. I have been looking around for the PN and it appear the board was used by other OEMs as well (ASUS, Viewsonic). If anyone has a schematic, it would be helpful.

    Quick look on the underside of the board, I can see:
    -D905 is blown - ? value
    -R920 is open - 1Ω ?W
    -R927 is open - 20Ω ?W

    On top side, I see:
    -R931 open - 0.68Ω ?W

    Metered short:
    -P9NK65ZFP

    Thank you
    Attached Files
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    • R_J
      Badcaps Legend
      • Jun 2012
      • 9514
      • Canada
      #2
      Re: BENQ GW2780-T power board blown

      D905 will be similar to a 1n4148, the wattage for R920 & R927 will be low, (1/8w?) they are in the gate drive circuit so there is low current. R931 is likely a 2 watt, but U901 will also be bad. And C922 is likely weak as well. Check that none of the diodes in the secondary are shorted as well.
      Last edited by R_J; 06-01-2022, 06:46 PM.

        Comment

        • Caspar
          Member
          • Apr 2013
          • 25
          • USA
          #3
          Re: BENQ GW2780-T power board blown

          Thank you so much for your advice! I placed order for the parts. Hopefully I can get them soon and swap them in for additional testing.

            Comment

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