Question about Dell M991 19" CRT Monitor

1 Answer

(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

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert who has written 20 answers of more than 400 characters.


    An expert who has answered 20 questions.

  • Expert
  • 147 Answers
Re: (Dell M991 CRT) Menu repeatedly appears, buttons act...

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

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

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.

Feb 03, 2010 | Dell M991 19" CRT Monitor

1 Answer

Deleted sound device driver in control panel and have no sound hardware, help

if you deleted your driver then you need to reinstall it.
  • open system properties
  • click on hardware
  • now click device manager
  • search through the list and see if you see a yellow ? .
  • if you see an out of date driver right click on it and select update.
thanks for ur question. ^_^

Sep 12, 2009 | Dell M991 19" CRT Monitor

1 Answer

M911 dell monitor not seen by computer

Go to cevice manager and update all monitors and/or visual devices and restart. It's possibly a conflict. You could also try disconnecting a device (the printer is usually the culprit!) and trying again

Apr 02, 2009 | Dell M991 19" CRT Monitor

1 Answer

Shadow Lines Across Screen on Dell P1130 CRT Monitor

What sort of shadow lines? I assume you haven't just noticed the two horizontal lines 1/3rd up the screen from the bottom and 1/3rd down from the top from the internal stabilizing wires that all Trinitron CRTs have?

Jan 29, 2009 | Dell P1130 21" CRT Monitor

1 Answer

Dell 991 monitor

On the front of the monitor is a menu button. Press it, and using the left and right buttons on the monitor navigate through the menus until you see brightness, contrast, etc. Then adjust them as necessary.

Sep 17, 2008 | Dell M991 19" CRT Monitor

1 Answer

Dell Monitor

Send me schematic power supply form Dell M991 thanks

Sep 13, 2007 | Dell M991 19" CRT Monitor

2 Answers

Menu screen keeps appearing

Hello, My name is Richard; I work for Dell here in Round Rock, Texas. From what you describe, it sounds like the menu button is depressed in such a way that small movement activates its function. I could not suggest any real corrective options as this is most likely a mechanical issue with the button, and would require a technician to open the monitor and inspect that. I am not going to recommend you open the monitor case as it can be dangerous. I would suggest you call our tech support at 1-800-822-8965 ex. 726-8859, and find out if the monitor is still under warranty. Regards, Richard B Dell Online Community Outreach

Apr 29, 2007 | Dell E773C 17" CRT Monitor

1 Answer

Philips monitor's Menu is locked

Hold the manu button for enternity and a day until the brighty all might menu appears.

Apr 07, 2007 | Philips Professional Brilliance 109P...

Not finding what you are looking for?
Dell M991 19" CRT Monitor Logo

Related Topics:

57 people viewed this question

Ask a Question

Usually answered in minutes!

Top Dell Computer Monitors Experts

Brian Sullivan
Brian Sullivan

Level 3 Expert

27725 Answers


Level 3 Expert

18258 Answers

William Miller
William Miller

Level 3 Expert

8795 Answers

Are you a Dell Computer Monitor Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides