Low EMF LCD monitor 2017

Version 7

This is another LCD monitor modified for reducing the electromagnetic emissions. This particular monitor has a 21.5" 16:9 display but the screen resolution is 1920 x 1080, which is Full HD. The input is VGA or DVI. The backlight hasn't been replaced, it is still the original LED array of the manufacturer, but now it is powered with a filtered DC voltage generated by a linear power supply. The voltage applied to the LED strip is between 40 and 50 V DC. This is an important result, as now the LCD module hasn't been opened at all so it certainly has no problems. The mainboard is enclosed in a thick aluminum box and it is powered by a separate circuit of the linear power supply, at 5 V DC. The frame is made of solid walnut wood and the back is made of okume plywood. The wooden frame was needed because the original plastic and metal frame could not be reused with the aluminum box on the back. Also the connector of the backlight has been changed, and now it is much more robust.

The results for the reduction of the electromagnetic emissions are very good, and the brightness of the display is also quite high. In this case the power supply has been designed and built to provide also the DC voltage for other small desktop devices, like the optical USB cable, the speakers set, or a desk lamp. This monitor size is perfect for all office and design work, and also for watching videos and movies.

The power supply

The power supply of this monitor provides also a separate 5V 3A exit and a separate 12V 1A exit, which can be used to power other devices on the desk. For example the 5V exit can be used to power the terminal of an optical USB cable, while the 12V exit can power a speaker set or a LED desk lamp. Of course the power supply box is supposed to be on the floor at some distance from the desk, near a wall socket. For more information about this project contact us.

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