VGA Dummy

If you have a computer that you want to have turned on, without the need for at screen, a VGA dummy can ensure that the computer can boot. I usen my VGA dummy on a server, which is controlled through RealVNC.

Theory and Materials
Diagram for VGA Dummy

The theory is simple. The computer must be tricked to think a screen are connected to the graphics card. This is dono by three resistors which simulates the resistens in a screen. The picture to the left show the pin-layout and where ot connect the reistors. The pins are described below:

Pin Name Description
1 RED Red Video (75 ohm, 0.7 V p-p)
2 GREEN Green Video (75 ohm, 0.7 V p-p)
3 BlUE Blue Video (75 ohm, 0.7 V p-p)
6 RGND Red Ground
7 GGND Green Ground
8 BGND Blue Ground

Reference: Hardwarebook.net
Parts for VGA Dummy

To make the VGA dummy you need a male VGA connector, three 75 ohm resistors and, if you want the deluxe version, a housing for the VGA connector. The price 28 danish kroner ( approx. 5 USD).

Soldering
VGA connector, soldering

The resistors are bent and the leads are cut to a suitable length. The leads fit in the holes in the pins, making it easy to solder the components.
Casing for VGA connector

After soldering the only thing left to do, is to mount the VGA connector in the housing.

Done
VGA Dummy

That is it, the VGA dummy is finnished and ready to be used on my server.
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