LCD TVs have taken over the world of visual entertainment like a sudden storm. In just a few years they replaced CRT --- or Cathode Ray Tube --- televisions because of their crisp display, power-saving ability and overall performance. They also come in several sizes; as of May 2011, the largest model for home use reaches 82 inches in diameter. Just like CRT Televisions, LCD TVs come standard with transformers and power supplies. Some of the important LCD TV parts include the LCD screen, inverter, main board, backlight and the AD board.
The LCD screen is the heart of the LCD TV. The TV can be rendered useless if the LCD screen gets damaged. Tiny pixels make up the whole LCD screen; each pixel's composition is made up of electrodes, filters and liquid crystal. Individual pixels can manipulate and adjust the light that passes through it by manipulating the amount of color on its sub-pixels. Pixels have three main sub-pixels of red, blue and green. When combined, these three colors can create any type of color on the visible spectrum.
Although LCD screens compose the heart of an LCD TV, these screens won't function properly without the help of a backlight. An LCD screen cannot generate its own light; although it can manipulate light that passes through it, it will not display anything unless a backlight "powers" it up. This is the major difference among LCD TVs and LED TVs. In LCD TVs, the most common backlights used are small fluorescent lamps situated behind the screen; whereas in LED TVs, LED lights are used to light up the screen.
Most modern appliances need inverters to convert direct current to alternating current for power. An inverter in an LCD TV plays this role and creates electricity to power up the backlight that provides illumination to the LCD screen, as well as other electrical components. If your LCD screen isn't transmitting an image, a damaged inverter should be culprit No. 1.
The LCD TVs main board plays the same role as a computer's motherboard. It handles input and output connections and processes the information from the subsequent devices for display --- making it the brains of the LCD TV.
An Analog to Digital (AD) Board converts analog information into digital information. LCD TVs are digital devices; however, some input devices may still use analog circuitry to process information. For an LCD TV to properly display these data, the analog voltages must be turned into digital information via the AD Board.
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