The projector on the conference table is out of order
The projector input signal decay, projected picture blur smearing jitter or even overlapping screen color phenomenon is serious, the projector is in use, some users require a large distance between the signal source and the projector, such as lifting the projectors are generally more than 15 meters away from the signal source, then the corresponding signal cable must be long, happen it is caused by the above phenomenon. This is not a projector failure, will not damage the machine, as long as the signal source after the installation of a signal amplifier or change a better quality line only tens of dollars, you can ensure that the signal transmission is more than 20 meters without problems
It's possible that your desktop VGA connector is broken. You can solder it again. Check red, green, blue 3 lines.
May be your desktop to the MCU VGA joint is broken, you can re welding, focus on examination of red, green and blue 3 line jitter may also be the machine power and high voltage power supply in which there is interference with line may also result in such phenomenon you use a long line to try something else there are no jitter if you in the power position change or the use of short-term try
