How to replace tv LCD screen led backlight strips

1. Replace the lamp tube or LED light bar as follows:

①→Although the failure rate of the lamp tube or LED light bar of the LCD color TV is not high, there are some cases of aging, ignition, or damage. If it is confirmed that the lamp tube or LED light bar is abnormal, the LCD screen needs to be disassembled for maintenance or replacement. Because the LCD panel is fragile and the internal structure of the LCD screen is precise, it is necessary to carefully operate according to certain steps when disassembling and assembling.
Second, the replacement lamp instructions:
①→Strictly speaking, the whole operation process of replacing lamp tubes or LED strips should be carried out in a dust-free environment. In actual operation, it should be carried out in an environment with less dust or dust-proof measures as far as possible. If possible, you can borrow a glass cabinet and use the clean space inside it to carry out operations.
②→When operating, you must wear clean white gloves to prevent leaving your hands on the LCD panel or homogenizing the component’s
fingerprint.
③→The removed screws should be stored in categories and marked to prevent errors during installation.
④→The workbench must be covered with a clean soft cloth or sponge pad to protect the LCD screen.
⑤→Before installing the LCD panel components, the surface should be dust-removed. To replace the lamp tube, you need to prepare the following tools: a small flat screwdriver and a small cross screwdriver, a pair of rubber gloves, a piece of hard thin plastic sheet, a new lamp tube or LED light bar, the diameters are 1.5mm, Several 2mm and 4mm heat-shrinkable sleeves, one sponge pad, one piece of dust-free cloth, as well as pins, tweezers, tape paper, electric iron, anti-static bracelet, etc.

2, How to change the light bar for LCD TV

Disassemble the LCD screen, you can see the two components of the backlight + screen, carefully remove the LCD glass from the backlight, and put it in a safe place.
Next, repair the backlight. When the frame of the backlight is disassembled, you can see the light tube or LED light bar. Remove the light tube or light bar and replace it according to the length. Change. Solder the lamp tube with a soldering iron, do a good job of insulating it, turn it on first to test the effect, and then put it back on the LCD glass.
It is not recommended to operate it by yourself. The LCD glass is very fragile, and the plane is slightly uneven when it is installed, and it will break immediately.
To replace the lamp, the welding technology must be excellent, the solder joints must be smooth and just right, especially the insulation must be handled well, and if it is not handled well, it will be a waste of time.
Related concepts

light tube
Ultraviolet lamps are referred to as UV lamps, in which ultraviolet rays are Ultraviolet, or UV for short. According to the different bands, UV-A, UV-B, and UV-C have different uses. Low-pressure ultraviolet lamps, namely germicidal lamps, are mainly used for sterilization and disinfection, and UV-B is also mainly used for ultraviolet inspection and medical treatment.

Backlight
A backlight is a form of lighting that is often used on LCD displays. The difference between the backlight type and the front light type is that the backlight is illuminated from the side or behind, while the front light is illuminated from the front as the name suggests. They are used to increase illumination in low-light environments and to brighten computer monitors and LCD screens, producing light in a similar manner to CRT displays. The backlight can be any color, and the monochrome liquid crystal usually has a backlight such as yellow, green, blue, and white. The color display uses white light because it covers the most color light.

liquid crystal
Liquid crystals can be divided into thermotropic liquid crystals and lyotropic liquid crystals. Thermotropic liquid crystals refer to liquid crystals formed from a single compound or from a homogeneous mixture of a few compounds. Substances that usually show liquid crystal phase within a certain temperature range. The molecular weight of a typical long rod-shaped thermotropic liquid crystal is generally around 200-500 g/mol. Lyotropic liquid crystal: is a liquid crystal formed by two or more compounds including solvent compounds. The liquid crystal phase occurs when the concentration of solute molecules in the solution is within a certain range. Its solvent is mainly water or other polar molecular liquids. The main reason for the long-range order of molecular arrangement in such liquid crystals is the interaction between solute and solvent molecules, while the interaction between solute molecules is secondary. A lyotropic liquid crystal is a liquid crystal formed by two or more compounds including a solvent compound. There are many different types of liquid crystal phases, which can be distinguished by their different optical properties such as birefringence. When a polarized light source is used, different liquid crystal phases will appear with different textures when viewed under a microscope. Different textures in the texture contrast region correspond to different liquid crystal molecules. However, the molecules are well oriented in order. And liquid crystal materials may not always be in the liquid crystal phase (just as water can turn into ice or water vapor).