Question about Dell M991 19" CRT Monitor
I'm assuming the red is gone completely; that is, it's not present at all and not just missing in video from the computer. If that's the case, you probably have a bent pin in the VGA connector, a bad signal cable, or possible video card failure.
The missing red might be due to bad solder connections. These often develop around parts that get hot, like the color output transistors. They also can occur on the circuit board that plugs onto the end of the CRT. If you're comfortable with electronic soldering you could examine the boards and repair any connections that look dodgy (grainy or visibly cracked around the component lead).
It's also possible there's been some component failure, and you won't be able to find that without some test equipment and experience with troubleshooting. It could be the CRT itself that's had it, especially if it's been around a while. Sudden loss of one of the colors is a very common failure mode.
Bottom line is check the soldering if you really want to keep this monitor, but beyond that don't bother repairing it. Not many servicers will work on computer monitors. And the cost of repair is likely to be uneconomical. New LCD monitors are quite inexpensive, and repairing your CRT one may approach replacement cost.
Posted on Feb 03, 2010
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Posted on Jan 02, 2017
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