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820-000165 no backlight

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  • 820-000165 no backlight

    820-00165 had mild water damage, replaced U7701 D7701 C7706 C7797 C7799 Q7707 and Q7706. Turns on and chimes and have image but no backlight.

    F7700 8.6V on pin 1 and 2

    L7701 8.6v

    Q7706 pin 3 2.8V

    Q7707 pin 3 0V

    r7789 147K

    what to check next??

  • #2
    Check integrity of feedback trace from D7701 to U7701.
    Pay atention to (in)famous XW7720 bridge; just between L/D7701, on the board.
    Post power and control voltages for U7701.

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    • #3
      Feedback trace was blown. Have backlight now but section of the screen is white, see picture. Is this a screen or board issue?

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      • #4
        Look like screen issue for me.
        You can discard/confirm 100% testing known good assembly...

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        • #5
          Yes screen issue. Solved

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