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HP Laptop screen black but works with external monitor

Discussion in 'Hardware' started by Dig111096, Jun 7, 2016.

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  1. Dig111096

    Dig111096 Thread Starter

    Joined:
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    I have tried so many things to fix this but nothing works. I can't contact HP, because I have no money and my warranty is up. Every time I turn on my laptop I hear the noise and see the lights on but the screen is pitch black. I tried shining a flashlight to the screen to check if I see the picture at all and the screen is just black.
     
  2. bobs-here

    bobs-here

    Joined:
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    First Name:
    Bob
    be sure the monitor settings for your graphics are not set to an external monitor. go to control panel, clicking Display Settings to check this out and toggle between screen 1 and 2. click the icon that corresponds to the monitor that you want to designate as the primary display, and then select the 'This is my main monitor' check box.

    if not, the use of the external monitor which works ok confirms the issue.

    its not the video chip or motherboard. could be the lcd screen itself or if it is the inverter. most of the times it is the inverter that is the problem and can be fixed, you just have to get the correct inverter that supplies the right amount of voltage and you will be back in business.

    sometimes its the backlight (light bulb) that went, which is more difficult imo and more time consuming. shine a flashlight on the lcd , if you see a faint image then in most cases it is the backlight that needs to be replaced. If you don't see an image even when shining the flashlight then it is most likely the inverter. if that helps.

    if deciding to look at repairs for the inverter, enter details of the model of the machine into youtube search. there are lots of teardown of repairs for a monitor, if this was decided.

    but the ability to perform the task and cost of replacing the parts would need comparing with the possibility of a refurb machine on a budget.
     
  3. managed

    managed Trusted Advisor Spam Fighter

    Joined:
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    First Name:
    Allan
    More modern laptops have an LED light source in the screen and don't need an inverter. If yours is the LED type you will have to buy a new screen, assuming the problem is the screen itself.
     
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