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    DV9000 Backlight problem (tried inverter already)

    Discussion in 'HP' started by XionXxen, Mar 17, 2010.

  1. XionXxen

    XionXxen Newbie

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    Hi all,

    I have a DV9000 and the LCD suddenly went dim. I thought the inverter had gone so bought and fitted one. However now when the laptop turns on for the first time I can see the display for maybe 1-5 seconds (5 on initial start, less on soft restarts), but then it goes dim again.

    I have tried unplugging AC/Batt and holding power for 20 seconds but it made no difference.

    Could I have purchased a faulty inverter or could this be another symptom. I want to avoid spending £100 to replace the screen if I don't have to.

    Thanks all.
     
    XionXxen, Mar 17, 2010
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  2. SDreamer

    SDreamer Notebook Consultant

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    You could always try an external display to rule out the video chip. If it works on the external display, something is wrong with getting the information to the built in display, meaning connections, or the assembly itself.
     
    SDreamer, Mar 18, 2010
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  3. brianstretch

    brianstretch Notebook Virtuoso

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    If an external display works, it's either a stuck lid switch or a bad CCFL backlight. Usually a failing backlight will show up as a reddish hue though. I'm not sure where the lid switch is on the dv9000. The dv2000 (14" version of your notebook) had a LOT of trouble with stuck lid switches. The solution is to disconnect the 2-wire lid switch cable.
     
    brianstretch, Mar 18, 2010
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  4. rdhood

    rdhood Notebook Enthusiast

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    Let me guess..... it has an Nvidia graphics adapter?


    NVIDIA DEFECTIVE GPUs


    Best thing to do is as previously mentioned... try the VGA out to a monitor and see if you get the same results. If so, and if you have NVidia, my condolences.
     
    rdhood, Mar 19, 2010
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  5. WindDrake

    WindDrake Notebook Enthusiast

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    The DV9000 uses a magnetic hall-effect sensor bolted to the left side frame mounts (heatsink assembly) to detect lid position.

    If replacing the inverter didn't do anything, you're facing down one of two things.

    Possibility 1: Bad CCFL Backlight. Replace LCD.
    Possibility 2: Bad SuperIO Controller. Replace Logic Board.

    Little known fact about the DV2/6/9000's. They all use an ENE SuperIO that uses GPIO Ports to handle the backlight trigger. When they crap out or start to fail, they can cause no backlight.
     
    WindDrake, Mar 19, 2010
    #5