Display on a https://www.szmaclight.com/product/4-inch-tft-lcd-480-480-pixel-cap... square LCD display will be displayed a line when it is first turned on, but after a while, it will be restored to its original color; at the beginning of the startup, the entire square LCD displaywill be reddish or blueish; https://www.youtube.com/watch?v=hh_x9jAHq8A The square LCD display will occasionally turn red while in use, but it will only be restored after a short period of time;Several people believe that this type of failure is the result of a hardware failure, while others believe that the picture tube has been scrapped, and still others believe that it is the result of damage to the display driver. These points of view are incorrect.Causes of failure and countermeasures include the following:Pole-touch faults (and sometimes only leakage faults) can only be repaired by qualified maintenance personnel, and the process is characterized by a protective shutdown of the system.Because of open circuit damage to the power supply resistance, the fault phenomenon caused by this damage is the same as that caused by damage to the contact pole. The full square LCD display is brought back to sweep the line, and a specific color is extremely bright, but this will not cause the protection to be turned off or otherwise compromised. Of course, if the resistance increases in size, it will need to be updated as well.During the rainy season, we must take into consideration the oxidation of the CRT connector. Despite the fact that there are only a few color deviation failures caused by this, the author has personally experienced it. Following an investigation, it is possible that the problem is due to poor design or component quality.If the display has been in use for more than five years, we can classify the problem as a color deviation failure caused by the aging of the electron gun in the liquid crystal display.