The so-called board wall is a wall composed of solid wood or gypsum board. When the solid wood is only 2cm thick, it can be driven in directly with a self-tapping screw. When the display lifter is gypsum board, first select the position, then use a utility knife to drill a hole in the center position, then place a wooden board in the hole on the hanger, and then use self-tapping screws to pass through the gypsum board and Wooden slats, so that they are fixed and reliable.

       Facing different walls, the installation method of the LCD TV mobile stand is also different, and the walls are mainly divided into brick walls, wooden walls, marble walls, etc., different wall avoidance capacity is different, therefore, according to different wall avoidance Type, using different installation techniques:

1. Ordinary brick wall to install LCD TV mobile rack

       This kind of wall does not need special tools and craftsmanship. It only needs to punch holes in the wall with a percussion drill, then install it and fix it with screws.

2. Install the LCD TV mobile rack on the board wall

3. Install LCD TV mobile stand on marble wall

       If it is a marble wall, you have to use glass drills, and while drilling, watering at the same time, so as not to burn the glass drill bit. When encountering a wall that the glass drill does not penetrate, you can use a percussion drill, but the percussion drill must be placed in the electric drill gear, otherwise the marble will be cracked. After the installation holes are drilled, the expansion screws can be installed, and they can be tightened.

4. Install LCD TV mobile rack on glass wall

       The glass wall is not just glass, the display lifter is a brick wall or board wall behind the glass. If there is a brick wall behind the glass, first use a glass drill. The glass drill has already drilled a hole in the glass. When it reaches the brick wall, it must be impact drilled. After the hole is drilled, the expansion screw is used as a filling ring. The thickness of the ring is slightly thicker than the glass to tighten the screws; if the wall is behind the glass, use a glass drill to drill the hole

What are the diodes commonly used in LCD circuits?

       There are many types of diodes for liquid crystal displays. Today, the editor of LCD lifter will tell you what are several common diodes?

1. Rectifier diode

       The diode that rectifies AC power into DC current is called rectifier diode. Rectifier diodes are mostly made of silicon semiconductors. The unidirectional conductivity of the PN junction is used to convert AC into pulsed DC, that is, rectification. Rectifier diodes are mainly used in rectifier circuits. Metal shell packaging, plastic packaging and glass packaging, etc., because the rectifier diodes are mostly surface contact diodes, the junction area is large, the junction capacitance is large, but the operating frequency is low.

2. Detector diode

       The detector diode can detect low-frequency signals modulated on high-frequency electromagnetic waves, and it has high detection efficiency and good high-frequency characteristics.

3. Zener diode

       Zener diodes use the principle that the voltage at both ends of the diode does not change when the diode reflects and breaks down to achieve voltage regulation limiting and overload protection. It is widely used in regulated power supply devices. The shape of commonly used Zener diodes is similar to ordinary low-power diodes. Various packages such as plastic case and metal case.

4. Switching diode

       When the switching diode is forward biased, the resistance of the diode is very small, and the reflection is biased.

Common failure causes and maintenance methods of the transformer of the LCD screen lifter

       Transformer is a kind of commonly used electrical equipment, whether it is in power equipment or various electronic equipment, it has an extremely wide range of applications. In different application environments, transformers have different functions. In power systems, transformers are used for power transmission and transformation. In electronic equipment, transformers can be used for voltage transformation, signal transmission, impedance matching, and electrical isolation.

The common causes of damage to the transformer of the LCD screen lifter are as follows:

       1. The power supply voltage is unstable, which is the main reason for damaging the transformer

       2. The load is too heavy, mainly due to short-circuit faults in the secondary winding of the transformer

       3. The working time is too long and the temperature of the transformer is too high due to poor heat dissipation.

The detection method of the transformer of the LCD screen lifter is as follows:

       1. Observe from the appearance whether the transformer is scorched, blackened or deformed. In the case of insurance failure, the damaged transformer can often be seen from the appearance.

       2. Test the paper properties of the transformer. Use the pointer multimeter RX10k to measure the resistance between the iron core and the primary burn group, the primary winding and each secondary winding, the iron core and each secondary winding, the electrostatic shielding layer and each secondary winding, and the resistance between each secondary winding. The pointer of the multimeter Both should mean not moving at the infinity position, otherwise the paper performance of the transformer is poor.

       3. Voltage method inspection. In the case of power-on, use a multimeter to block the AC voltage and measure the AC voltage of the secondary winding of the transformer with a display lifter. If the measurement is zero, then measure the primary voltage of the transformer. If there is a voltage of 220V, it indicates that the transformer is faulty.

       4. Detection by resistance method. Use a multimeter to block the electricity and measure the resistance values of the primary winding and the secondary winding of the transformer. The primary winding resistance is generally between 50-150 ohms, and the secondary winding resistance is generally less than a few ohms. If the resistance is too large, it indicates a fault.

       5. Detect the on-off of the coil. Measure the resistance value of each winding with the RX1 gear of the pointer multimeter. If the resistance value of a certain winding is infinite, it means that the winding has an open-circuit fault.

       6. Detect the no-load current of the transformer.