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the controls are bad. get a new monitor or order a new control set, from maker. is it still in warranty? some are 1year. read your warranty car, and read the manual for authorized LG service, its all in the box , new. read that. or go to LG.com and read there. for service.
in my estimate the keys are shorting. this is common, if they are hit too hard. ship damage etc. I remove the key pad , cable, if the pop ups stop, BINGO.
The issue you describe it caused by the video board going bad. All of the controls for video display, clocking, brightness, contrast, and input source is handled by this card.
They are replaceable, if you have the part number. Most of the time they range from $50 - $75
Press one of the buttons on the monitor to activate the OSD (On Screen Display). Wait about a minute -- the OSD probably will cancel itself, if you've pushed the correct button.
Then, use the other "left/right" or "up/down" buttons to navigate through the various settings (contrast, brightness, et cetera) until you get to the "language" setting. Press the "accept" button to select it.
Press "left/right" or "up/down" until 'English' is displayed. Press the "accept" button to choose that language. Then, wait a few minutes, for the OSD to "self-cancel".
HelIo! right after computer inclusions on the monitor screen have a tablet with the message which disturbs to work. The message: brightness of the monitor of 100 %! A problem: how to clean from the screen this tablet so she prevents to read the information. I have not found adjustment in the menu of the monitor brightness. And what should be brightness: 100 % or another? have not found adjustment in the menu of the monitor brightness. And what should be brightness: 100 % or another?Thanks and sorry about my bad english. Afzal.