How to Test LCD Monitors
When buying a new or used LCD monitor, the first thing you need to do is test it to make sure it works. Dead pixels, display issues, and malfunctioning inputs are problems that might plague your monitor and are best dealt with while the monitor is still under warranty. It's important to test your monitor the first time you use it in order to ensure you're getting your money's worth out of your display.
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Instructions
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Connect your monitor's power cable into the power cable input and plug the cable into a working power outlet. Press the power button on your display to make sure it turns on.
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Connect a device to each of the monitor's available inputs. For instance, if the monitor has a VGA input, connect it to a PC. If it has HDMI inputs, connect a video game console to it. The inputs on LCD monitors vary from model to model.
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Test each input by setting the monitor's input channel to each input and powering on the device connected to each respective input one at a time. If the input is functioning, the device will display on the screen when powered on and set to the right input channel.
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Run the monitor through your PC's "Display Color Calibration" program to make sure it displays colors accurately. This option is found through the computer's Control Panel under the "Display" option.
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Explore the menus and settings on the display using the buttons on the monitor. While you don't need to actually change the settings, you do want to make sure the buttons on the monitor work.
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Carefully examine the monitor while it is powered on. Search for pixels that are discolored. These pixels are dead pixels and cannot be repaired. While the monitor still functions as normal, this pixel will always be broken. If this bothers you, exchange your monitor where you bought it for a new one. Dead pixels are most easily found when the display is showing one solid color (e.g. all black, blue, or red).
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Tips & Warnings
Carefully read the monitor's user manual before using.
In some cases, a monitor will only function when connected to a device. Connect a monitor to an external device like your PC or a game console when adjusting the settings, otherwise it may fall into sleep mode to conserve power.
Visit your model's support site for specific troubleshooting issues before returning a monitor; make sure it requires a return, and not a quick fix.
