Periodically, the contrast menu will appear on the screen by itself. When the exit button is pushed, the contrast menu will disappear for a few moments, only to reappear again. This will usually happen 4-6 times in a row, and then the problem goes away for a while. Is this a known problem?
I had a simalar problem with my Dell 2001FP. The issue is that there is false triggering of the switch; you need to open the front panel, and electrically remove the swictch from the circuit by:
1) analyze the circuit; its usally pretty simple - a voltage drop circuit.
2) disable the switch by either removing it with a solder gun or, simply by using a sharp blade and cutting the PCB track leading it to it, as I did.(much easier - and reversible!)
Fixed my problem.
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it happens due to excess moisture in air when the switch gets shorted by itself due to dust accumulation ,If in warranty pls log a call or else get it checked by a monitor repair person all monitors have same switch's
Try pushing the buttons for the brightness if it does the same thing you need to replace it, the buttons might be damaged already by pushing too hard or it got stuck. If this is just a new LCD monitor about 1 to 2 years old contact tech support of dell so you can get this replaced.
One of the buttons will activate the OSD (On Screen Display).
The OSD controls everything about the monitor, including BRIGHTNESS and CONTRAST. Use the other buttons to move between menu-items, and to "select" one of the sub-menus, and to raise/lower settings, and to "exit" from a sub-menu to the main-menu.
Sounds to me to be either a failing button position replacement spring in the button itself. This problem also could be caused by dirt buildup surrounding the hole in the monitor bezel where the button protrudes. Try using a dental tool or something small and pointed to clear any possible debris from the buttons edges. Also some canned air may help. If these things don't fix your problem the bezel may need to be removed for a more thorough cleaning. If you are able to make it dissapear by pressing the button it most likely isn't hardware failure causing your problem, as those buttons are rarely used.