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.
Related pages
LCD monitor emissions
Low EMF computer display
Low EMF desk 2015
