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Dell U2711 LED Backlight

Replacing the faulty CCFL backlight of a Dell U2711 monitor with LEDs

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I aim to replace the CCFL backlight of a Dell U2711 monitor but still retain the original brightness controls. I am using the readily available 12V 5050 led strips. Fortunately the power supply to the CCFL inverter was 24v so it was east to connect 2 of the 12V LED strips in series. The LEDs definitely provide enough brightness, however I now need to build the control circuitry to handle the brightness.

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Erwin wrote 06/05/2019 at 15:22 point

Can you tell me what type of backlight this monitor has and maybe if it is available online? I have the same U2711, but like to replace the CCFL to get in back in normal working order.

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Thomas Chanon Wangtrirat wrote 10/26/2015 at 08:59 point

Hi! I'm Thomas. I have similar modification like yours but instead I used RGB-LED to make it Wide-Gamut Display. As The U2711 have WCG-CCFL the color gamut is extended with narrower primary color. You should mod it with RGB-LED. But with more complexity of controlling portion of R-G-B amount which vary the color temperature of the monitor.

I have posted similar mod with my Dell 2408WFP. Check it out.

https://hackaday.io/project/8140-wide-gamut-monitor-with-5050-rgb-led-mod

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Øystein wrote 02/25/2015 at 23:37 point

cool project, I would imangine that the warm white leds would create an incorrect color balance. Had any problems with that?

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flaming_goat wrote 02/25/2015 at 23:52 point

Haha yes, I doubt this will be useful for color sensitive work anymore, but adjusting the color balance makes it look pretty normal (the picture makes it look more orange than it is and only 6 of the 16 strips are on in that picture). I would probably recommend cool white or perhaps rgb if someone else was to try this.

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