LCD LED TV Display Repair Lessons Sinhala 2 | All Led tv panel common problem with Photo

Описание: The specific details about LED TV panel voltages can vary depending on the make and model of the television. LED TVs typically consist of several components, including the LED backlight system and the LCD (liquid crystal display) panel.

It's crucial to note that working with the internal components of a TV can be hazardous, and attempting to measure or modify voltages without proper knowledge and safety precautions can lead to injury or damage to the TV. If you have specific concerns or need detailed information about your LED TV's internal voltages, it's recommended to refer to the TV's service manual or consult with a qualified technician.

If you provide the make and model of your LED TV, I can offer more precise information based on the available specifications.
Repairing an LED TV can be a complex task and often requires technical expertise. Here are some general steps you can consider, but keep in mind that these are basic guidelines, and the actual repair may vary depending on the specific issue and TV model. If you're not comfortable or experienced with electronics, it's advisable to seek professional help.

Introduction
LCD or flat panel computer displays are the latest and greatest offerings
in the desktop computer industry. They have been used for years in the
portable and notebook computing markets, but recent developments have
increase performance and size while reducing costs making them viable
in the desktop environment. LCD displays are lightweight, extremely thin
and use much less power than CRT based monitors.
What is Liquid Crystal and How It Works?
Liquid crystal was discovered by the Austrian botanist named Fredreich
Rheinizer in 1888. Liquid crystal is an unusual organic material and it is
neither solid nor liquid. That means although it is liquid in form and
appearance, Liquid Crystal exhibits a crystalline molecular structure that
resembles a solid. Liquid crystals are rod-shaped molecules whose
molecules can be aligned precisely when subjected to electrical fields. As
a liquid they are able to flow over and around small grooves and can
change their position depending on applied voltage. When properly
aligned, the liquid crystals allow light to pass through makes the desired
images appear.

A fluorescent light source, known as the backlight, makes up the rearmost
slice of bread. Light is shined from behind the panels. This light passes
through the first of two polarizing filters. The polarized light then passes
through a layer that contains thousands of liquid crystal blobs arrayed in
tiny containers called cells. The cells are, in turn, arrayed in rows across
the screen; one or more cells make up one pixel (the smallest discernible
dot on a display). Electric leads around the edge of the LCD create an
electric field that twists the crystal molecule, which lines the light up with
the second polarizing filter and allows it to pass through. Each crystal
either allows light to pass through or blocks the light. The configuration
of the crystals forms the image

In a colour LCD panel, each pixel is made up of three liquid crystal
cells. Pixels do not actually generate the colours that you see. It is the
white light (backlight) passing through each pixel, which filtered to form
the intended colour. The front glass is coated with colour filter material in
front of each red, green and blue dot (cell). Light passing through the
filtered cells creates the colours you see on the LCD.
Each cell or subpixel, can be individually addressed with a control
voltage. This means, for example, that a 15” LCD Monitor screen that
have the resolution of 1024 x768 contains 2,359296 subpixels (1024 x
768 x 3). Occasionally the mechanism that sends the electrical current to
one or more pixels fails; in those instances you'll see a completely dark
cell (bad cell) or a "bad" pixel. Read more information about bad pixel in
the chapter of “Stuck and Dead Pixel in LCD Monitors”.



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