What is overscan and why do LCD, plasma and projection TVs do it?

Overscan occurs on your high definition LCD, plasma and projection TVs when the video image is enlarged slightly and the outer 3% is cropped off. Engadget HD has an extremely thorough explanation of overscan, but we’ll boil down the important points here for you.

Overscan is a remnant of CRT TV days when images needed to be enlarged slightly to ensure the quality of the image at the center of the screen. There is no real excuse for continuing the practice today other than, “that’s how it’s always been done.”

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Why are there black bars on my widescreen TV?

One of the most common questions from new widescreen TV owners is: “Why are there black bars on my widescreen TV?” The simple answer is that your TV and the video you watching have different aspect ratios. There is nothing wrong with your TV.

This “pillar box effect” most often happens when you are watching a video or broadcast that was shot in standard definition with an aspect ration of 4:3. Because your widescreen TV has an aspect ration of 16:9, the picture can not properly fill the entire screen.

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Plasma TV Repair FAQ at Pioneer

I was looking around at the Pioneer plasma TV repair support site today to get a sense of common repair problems they have with their TVs. They list only 6 problems in their FAQ, leading me to believe these are their most common issues. Or at least the ones most easily handled without professional help. Below are the problems and a short summary of solutions. Where we offer more detailed instructions, I’ve linked there.

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How to clean a plasma TV screen

Cleaning solutions and kits for your LCD TV screen can be purchased at your local computer or electronics store.

Cleaning solutions and kits for your plasma and LCD TV screens can be purchased at your local computer or electronics store.

If you have a large, flat-panel plasma TV, no doubt you have collected finger prints on the screen. Luckily cleaning a plasma TV screen is a simple process that shouldn’t take too long.  Modern plasma TV screens are more sensitive to being damaged by cleaning than old, cathode ray tube televisions, but with a little care that won’t be a problem.  First, it’s important to note that you should not use any cleaning solution that contains ammonia, such as Windex, or bleach. These chemicals will react to the polymer screens, causing long-term damage. The screens are also easily scratched, so be certain your cleaning cloth is soft, such as a microfiber cloth or lens cloth.

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