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Backlight Rapidly Flashing - 23" Cinema Display

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    Backlight Rapidly Flashing - 23" Cinema Display

    Hi All,

    Haven't posted in years, but happy to see these forums are still active! Anyway, I have a 23" Apple Cinema Display which is exhibiting a weird issue. When connected to a known-good power supply and video source (as tested with its sister display), the unit powers up and displays video, however, the backlight flashes/strobes on and off approximately twice per second. There is a small, audible noise which accompanies this activity.

    I consider myself to be competent with displays and TVs, having successfully repaired many of each, this issue is something I've had a harder time tracking down. I'm thinking this sounds like an inverter issue of some sort - like something is shorting or pulling down the voltage.

    I know this is an older display, but I'd love to be able to get it running again. Thanks in advance!

    #2
    Re: Backlight Rapidly Flashing - 23" Cinema Display

    Please upload good clear pictures of the boards and how all the boards are connected together, that will be a start.
    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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      #3
      Re: Backlight Rapidly Flashing - 23" Cinema Display

      https://www.badcaps.net/forum/showth...t=Apple+Cinema

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        #4
        Re: Backlight Rapidly Flashing - 23" Cinema Display

        Thank you for your responses.

        Budm - I will get pictures uploaded as soon as I can.

        Vinceroger69 - I've seen that thread, which is about troubleshooting the power supply, not the actual display. The power supply I have works just fine on another unit.

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