According to the industry classification, customized P3.91 LED display is still an electronic product. As long as it is an electronic product, it will inevitably fail during use. So what are the tips for repairing customized P3.91 LED displays?
1. Partial "dead lights" problem
Partial "dead light" means that one or several lights on the light surface of the customized P3.91 LED display are not bright. This kind of non-light is divided into full-time non-light and partial color non-light. Generally, this situation is caused by a problem with the light itself. Either it is damp, or the RGB chip is damaged. Our maintenance method is very simple, that is, replace it with the spare LED lamp beads provided by the factory. The tools used are tweezers and a heat gun. After replacing the spare LED lamp beads, use Test the test card again, if there is no problem, it has been repaired.
2. Missing local color blocks
Friends who are familiar with customized P3.91 LED displays must have seen this kind of problem, that is, when the customized P3.91 LED display is playing normally, a small square of different colors appears, which is square and square. This kind of problem is usually caused by the burning of the color IC behind the color block. Yes, the solution is to change to a new IC.

3. Partial black screen and large area black screen
Usually we say black screen means that when the customized P3.91 LED display screen is playing normally, one or more LED modules will not light up in the entire area. We call it a partial black screen if a few LED modules are not lit. More areas are called black screens. It is a large area of black screen. This phenomenon occurs, generally we first consider the power factor. Generally, check whether the LED power indicator light is working normally. If the LED power indicator light is not on, the power supply may be damaged. Just replace it with a new power supply of the corresponding power. You should also check whether the power cord of the LED module corresponding to the black screen is loose. In many cases, re-twisting the thread can also solve the black screen problem.