The dead light phenomenon occurs after the LCD splicing screen product is used for a period of time. There are two reasons why the lamp does not light up. One is the poor welding quality, the other is the poor electroplating quality of the bracket. The increase of the leakage current of the LCD splicing chip will also cause the LCD splicing lamp to not light up. At present, many LCD splicing products do not have anti-static protection to reduce costs, so it is easy to cause the chip to be damaged by induced static electricity. Thunder in rainy days is likely to cause high-voltage static electricity induced by power lines, and overlapping spikes of power lines will cause damage to LCD splicing products to varying degrees.
The dead light inspection method of the LCD splicing screen requires manual operation. Solder the dead light of the faulty soldering on the metal belt with two lead wires soaked in, so that the gel outside the LCD splicing is completely dissolved and then taken out. By observing the welding condition of each welding point under the magnifying glass or microscope, we can find out whether it is the second welding or the second welding, whether it is the wrong parameter setting of the gold wire ball welder or other reasons, so as to improve the method and process and prevent false welding. Hefei mosaic screen
Then use a lighter to heat the LCD splice lead to 200-300, remove the lighter, and use a 3V button battery to connect the LCD splice with positive and negative electricity. If the LCD splicing lamp can be turned on at this time, but with the decrease of the lead wire temperature, the LCD splicing lamp will change from on to off, which proves that the LCD splicing lamp is faulty soldering. The reason why heating can light up is to use the principle of metal expansion and contraction. When the lead of the LCD splice is heated, it expands and extends and is connected with the internal solder joint. When the power is turned on, the LCD splice lights up normally. As the temperature drops, the lead of the LCD splice shrinks and returns to the normal temperature. When disconnected from the internal solder joint, the LCD splice lamp will not light up. After repeated attempts, this method proved to be effective.
