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Sometimes heat is a real big issue with LCD monitors, over time it causes fractures and circuit breaking in the chips and pops off a few capacitors. It is likely that your control board has a couple bad capacitors and/or components that have failed yet have not removed the display capacity. So your T-Con board is likely not the issue.
When searching online use your monitors make model and production date and include "Main Control Board" so you can find products that are for your unit.
Searching Ebay and Amazon are common places these units will be sold and run anywhere from 5$ to 200$ depending on your monitors grade.
You can go to the Envision customer support website and look for the driver under the driver support section for you model monitor. The website is. www.envisiondisplay.com. You can also call the Envision customer support at this telephone number. !-888-838-6388. They should be able to help you with getting the correct driver to support your set-up. I hope this information helps you with your problem.
This problem is a failing of the backlight circuits. the lamp is either failing or the power circuit is failing, causing the lamp to dim down it power output. Return to dealer for service. Hope this helps you.
You may have to match up the video card settings with the monitor settings to get the correct resolution setting. Try adjusting the resolution of the graphics card to match the setting for the monitor. If this does not work you can call, Envision customer support at this telephone number : 1-888-838-6388. They should be able to help you get the correct setting for you set-up. I hope this information helps you with your problem.
Try setting the refresh rate to 60 Hz. (Maybe 75).
Is it xp?
Right click an empty part of the screen, properties, under monitor (I think; I'm on Vista) you can choose the refresh rate.
Most LCD's should be at 60 Hz.