Inverter is a pen-sized board that is usually placed on the bottom of the LCD screen, either in the same case with the LCD screen, or above the keyboard. The inverter is one of the key parts within a display; it allows for the laptop’s display to be lit by providing power to the screen’s backlight.

As you know from our previous blog posts, there are two types of LCD screens: LED and CCFL.

LED and CCFL are merely the backlight types – everything else is just the same. As LED [Light Emitting Diode] screens don’t need the high voltages as of a cathode lamp, and LEDs require a DC voltage, the LED screens do not use the inverter.



That leaves us with the CCFL (Cold Cathode Fluorescent Light) backlight type screens.

The only company that uses screens that have an inverter attached to the LCD is Dell. Normally, the inverter will be held by two screws; however, in some cases, instead of screws, a double-sided tape is utilized.

Note: not ALL CCFL screens for Dell will have an inverter attached to the LCD. The easiest way to tell if the screen comes with an inverter is to look at the picture of the screen. For example, on a classic Dell Latitude D620, all screens come with an inverter attached to the bottom of the LCD.

Dell screen with an attached inverter

Dell screen that does not have an inverter attached

However, on a Dell Vostro 1720, the CCFL screens do not come with inverters.

Anytime you are uncertain about the screen specifics, make sure to contact our support department.


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  1. Karthik

    My laptop screen is that of a dell inspiron 15 7559. It is a LED backlit full hd screen. The display seems to be very dim. I can see the display clearly only when I shine light from the back of the screen. What should I do? Should I replace the screen? Or just the LED’s? Or? When connected to an external monitor, i can see the display.

  2. Brian

    Sounds like power going to a row of your leds or the leds are bad themselves. You can test the led rows individually and find the culprit. From there you can decide what you want to do. A little bit of tedious soldering under a magnifying glass might get that thing running bright again for cheap depending on the problem. Though it is 3 years since your post and im guessing you did something by now. If it’s still lying around somewhere it could be a fun project.

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