What is the "light test"

I cannot find a definitive answer on the LCD "light test". I have several flat screen monitors I want to ship to a buyer. Do I have to hook them up and test for working condition? I do not want to pay for shipping and have the screens rejected. What is required of the monitors to not be rejected? Many thanks in advance.

usually just no cracks or bleeding. by shining a light on the screen it just makes the cracks and bleeds show up better. Personally if you use gorven here on the forum and just send all your screens you will definitly make out. I have yet to be disappointed in the return I get from my screens.