LCD of Laptop is dark, while pluged in


  1. mj2000
    Posts : 59
    Windows 7 Starter SP1 32bit
       New #1

    LCD of Laptop is dark, while pluged in


    Hi all.
    I am using Dell Inspiron 1520 on Windows 7 SP1.


    I have a sudden problem :


    The LCD is real dark, but when i disconnect the ac adaptor, it is ok. Also : there is no problem while using the battery. But while plugged in, the brightness is low.





    I appreciate your help !
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  3. Yard Dog
    Posts : 1,514
    Win 7 Home Premium SP1 32 bit
       New #2

    Hmmm.. mj2000 .. sounds like a bad ac adapter . Any chance.. you can swap out with a known good one ?
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  4. mj2000
    Posts : 59
    Windows 7 Starter SP1 32bit
    Thread Starter
       New #3

    I am using my original ac adapter. Anyway i used another compatible one, the problem still exists.
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  6. HarriePateman
    Posts : 3,904
    Windows 7 Ultimate 64-bit
       New #4

    Is the laptop old?

    It sounds like something is shorting inside the case.

    Blow all the visible just away.
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  7. AddRAM
    Posts : 13,576
    Windows 10 Pro x64
       New #5

    What is the brightness set to while plugged in ?
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  8. z3r010
    Posts : 51,477
    Windows 11 Workstation x64
       New #6

    Have you tried the laptop brightness controls? a quick google says pressing the "FN" key + the up arrow should do it.
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  10. gregrocker
    Posts : 50,642
       New #7

    Check also in Control Panel>Power Options>Change Plan Settings what the Screen Brightness settings are when on A/C power:
    Attached Thumbnails Attached Thumbnails LCD of Laptop is dark, while pluged in-capture.png  
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