Number of views：2014order Release Date：2020-11-26

Soak the liquid crystal splicing with concentrated sulfuric acid to dissolve the external colloid. After the colloid is completely dissolved, take it out and observe the welding situation of each solder joint under a magnifying glass or microscope to find out whether it is a problem of primary or secondary welding, whether the parameter setting of the gold wire ball welding machine is incorrect, or other reasons, in order to improve the method and process and prevent the occurrence of virtual welding again.

Heat the LCD splicing light that is not lit up to 200-300 ℃ with a lighter, remove the lighter, and connect the LCD splicing light to the positive and negative poles with a 3-volt button type battery. If the LCD splicing light can light up at this time, but changes from on to off as the lead temperature decreases, it proves that the LCD splicing light is virtual soldering. The reason why heating can light up is based on the principle of metal thermal expansion and contraction. When the liquid crystal splicing lead is heated, it expands and elongates to connect with the internal solder joints. At this time, when the power is turned on, the liquid crystal splicing can light up normally. As the temperature drops, the liquid crystal splicing lead shrinks back to room temperature and disconnects from the internal solder joints, and the liquid crystal splicing light will not light up. This method has been tested repeatedly and is effective.

However, users of LCD splicing wall products (narrow edge splicing screens) may also encounter the phenomenon of dead lights. This is because after using LCD splicing products for a period of time, dead lights occur. There are two reasons for dead lights. Open circuit dead lights are caused by poor welding quality or problems with the electroplating quality of the bracket. Increased leakage current of the LCD splicing chip can also cause the LCD splicing lights to not light up. Nowadays, many LCD splicing products do not add anti-static protection in order to reduce costs, so it is easy for chips to be damaged by induced static electricity. Thundering on rainy days can easily cause high-voltage static electricity to be induced in power supply lines, as well as peak pulses superimposed on power supply lines, which can cause varying degrees of damage to LCD splicing products.