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Question:

The displays on some of our lab monitors are wavy.?

I’m a computer teacher and teach in a lab that has 25 computers. The computers are side by side for the most part. They are all new LCD monitors. I had this problem with the old CRT monitors, but thought that the new LCD monitors would have some type of filters that would eliminate such interference. Is there anything I can do to rectify this problem?

Answer:

LCD monitors are completely immune to the problems of CRT monitors. When you say wavy, are you talking about vertical waves or horizontal? Are they standing waves or do they drift across the screen? Are the waves luminous waves or color waves? Are they ALL experiencing this problem? Of those with the problem, are the patterns identical and synchronous or are they independently wavy? Are all the computers identical systems? Do all the computers share a common power source? You say you're a teacher, which makes me take this shot in the dark: Does your institution also have a radio lab (I.e.: a class capable of producing a strong source of EMI)?

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