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I have a VGA distribution system that matrixes 4 computers to 4 displays (2 LED,LCD, 2 projection). Periodically, the VGA outputs go pink. The whole screen has a pink cast and little other color than black. We've mostly seen this from the Dell laptop docking stations. I cannot say whether either of the other 2 outputs have ever produced this.

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Hi.

The VGA transmits signal in RGB format. This means that the signal is split in Red, Green and Blue single channels, that are then put back together to form the picture on monitor display.

When the green channel is missing, the picture turns pink.

If the problem is on a sigle monitor, or on a single video connection, it can be the monitor or the cable. A defective part not working on green channel will in fact generate a dark pink picture.

If you use a VGA distribution amplifier, and the problem is happening erratically on all monitors, try replacing the connection cable from computers to the VGA splitter. A shorted input can mess up the whole system.
If that does not fix the problem, than the VGA distribution amplifier is occasionally failing on green channel and must be replaced. Here an 8 ports splitter: VGA Video Splitter / Distribution Amplifier 8 Port - 250.

Regards.

Ginko.

Posted on May 13, 2010

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