Dell U3011 - backlight problem.

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  • ShockWave2048
    New Member
    • Dec 2015
    • 2
    • Ukraine

    #1

    Dell U3011 - backlight problem.

    Hi all!
    I'm trying repair monitor. Dell U3011.
    Have some expirience with electronics.
    Describe problem:
    - this start year ago, not in all power on cases backlight start working, fix with some switches power buttton (1-3 times)
    - month ago, backlight was go off, in 2-10 minutes after run, after this cycles (pwr on <-> timeout <-> backlight off ) set stable mode and can work weeks without power off.
    - now it can't backlight on 20-30 power cycles, but on next day can be runned in one time and good working before power off, it's totaly random case
    - all others systems works good, self check ok, pc find device and data from DVI, enabling test modes (1-4 btns)
    - start from wait mode, also randomly, and can work to pwr off

    Now mon have removed decor panels, and metallic shields from mainboard, pwr source, and invertor.

    What can i do now for tasks sequnce of search problem?
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: Dell U3011 - backlight problem.

    Please up load good clear pictures of the boards.
    May want to read this also:
    https://www.badcaps.net/forum/showth...l+U3011&page=2
    Last edited by budm; 12-16-2015, 11:18 AM.
    Never stop learning
    Basic LCD TV and Monitor troubleshooting guides.
    http://www.badcaps.net/forum/showthr...956#post305956

    Voltage Regulator (LDO) testing:
    http://www.badcaps.net/forum/showthr...999#post300999

    Inverter testing using old CFL:
    http://www.badcaps.net/forum/showthr...er+testing+cfl

    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
    http://s807.photobucket.com/user/budm/library/

    TV Factory reset codes listing:
    http://www.badcaps.net/forum/showthread.php?t=24809

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