Question about Dell M991 19" CRT Monitor

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(Dell M991 CRT) Menu repeatedly appears, buttons act erractic

This monitor has been my project for the past few days. Everything else about it is working beautifully. First thing I did was replace the lm7805 regulator which feeds the menu-button board. This appears to have fixed the problem for about 24 hours or so... now its come back with a vengeance. pfft... at least I suppose I'm on the right track. Would a failed storage/decoupling cap have this kind of effect? (at this point I'm thinking theres a loss of stability in the 7805) Maybe adding a heat sink to the regulator (dell didnt place one on it)? Only other possibility I can think of would be altering the resister values along the circuit run from the 7805 to the the buttons then the micro controller (its actually a straight shot, from what I can tell) I'd appreciate any advice, Thanks in advance

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Try removing the control panel, and then removing the plastic caps for the buttons. Clean each button cap and it's corresponding hole in the chassis with rubbing alcohol and an old toothbrush. Often, it's just grime, dirt, coffee or orange juice that causes menu buttons to stick.

Posted on Sep 17, 2008

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Posted on Jan 02, 2017

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My Dell M991 TCO-99 monitor has lost the red colour i.e. there is NO red at all, an of course all the other colours are affected - shifted towards blue - is it the end of the CRT or can it be fixed by...


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.

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1 Answer

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