Liquid crystal display technology works by blocking light. Specifically, an LCD is made of two pieces of polarized glass (also called substrate) that contain a liquid crystal material between them. A backlight creates light that passes through the first substrate. LCD Monitors. Liquid crystal display technology works by blocking light. Specifically, an LCD is made of two pieces of polarized glass (also called substrate) that contain a liquid crystal material between them. A backlight creates light that passes through the first substrate.

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there are some common issues in Television screen.

1. Spider lines extending from a localized point on the screen.
2. The TV set or Projector is completely dead with no lights at all.
3. The TV set has sound but no picture.
4. Multi colored lines from top to bottom of picture.
5. The tv set has picture but no sound.

Older television sets use CRT (cathode-ray tube) technology to produce onscreen images. Although CRT sets are usually reliable and can produce brilliant pictures, they have declined in popularity in recent years due to the availability of LCD and plasma sets. These newer sets are much less bulky and come in bigger screen sizes. Older CRT sets can suffer a range of problems including picture interference caused by magnetic energy and weak antenna signals. Serious technical problems usually require professional help, but many repairs can be undertaken without expertise