Question about Dell Inspiron 1721 Notebook

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I have a Dell inspiron 1721. The screen is dim ... when I try to adjust the brightness it won't adjust any brighter than it already is and makes some type of humming noise at the settings in the middle. Thanks!

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Try attaching an external monitor to the laptop & see if you could get any display on it. If this is successful, then you might have either a faulty LCD cable or screen inverter board.
The LCD cable transfers data signal from the motherboard & video card to the LCD screen. It also supplies high voltage DC power to the screen inverter board. The screen inverter board works as a power supply for the backlight lamp mounted inside the LCD screen. It converts low voltage DC power to high voltage AC power needed for the backlight lamp

Posted on Sep 06, 2010

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Posted on Jan 02, 2017

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Hi,
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Try to change the setting of the brightness in BIOS,
You can access bios by pressing f2 after you turn on the computer, then you will see brightness there, max out the brightness.

If it still does not work then go to the power options of your laptop then change the setting of the brightness when the charger is plugged in.

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Yes you can go into your display properties and look in the settings tab and look for advanced click that and open color tab or the overlay tab, color tab should get your brightness turned up, And if you can't see you can go into your bios and adjust your brightness from there and get it back to where you can see it if you can't write me back here so we can try another method. Ok I hope that helps you out somewhat, Oh yeah you can also hook up an external key board into your usb connections and you should be able to work everything from that too.

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