If referring to a CRT (Cathode Ray Tube) then this uses three electron `guns' namely Red, Green and Blue. If red is lost the connection to the red gun has been lost or more rarely the gun itself is damaged.
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The red light on your screen could indicate an issue with the display or the device itself. It may be due to a loose connection, a malfunctioning component, or a software-related problem. Try restarting your device to see if the issue resolves itself, or consult the manufacturer for further assistance.
Because red, green, and blue are the three primary colors of light from which all other colors can be made.
Red
Take a hammer to your screen until it knocks the loose part back into place.
yes
They were probably loose.
You don't you just loose!
Frigget
Fall leaves typically display a range of warm colors such as red, orange, yellow, and brown.
The Red Skelton Show - 1951 The Taming of the Screw-Loose - 16.15 was released on: USA: 27 December 1966
Plug in your red video cable. It has probably worked out of the connector either at the TV end or at the box.