LED display is an electronic product, which may fail during use. So what are the tips for repairing LED display?
Led Screen Display Repair
LED display screen is composed of LED modules spliced one by one. Its basic structure is display surface (lamp surface), PCB (circuit board) and control surface (IC component surface).
First, let's talk about common faults. Common faults include "dead lights" and "caterpillars" in some areas, lack of color blocks in some areas, black screens in some areas, black screens in large areas, disordered codes in some areas, etc.
1、 "Dead light" problem
"Dead light" means that one or several lights on the light surface of the LED display screen are not on. This kind of non lit place is divided into full-time non lit and partial color non lit. Generally, this kind of situation is that the lamp itself has a problem, either damp or the RGB chip is damaged. Our LED screen maintenance method is very simple, that is, we can replace it with the spare led beads provided by the factory.
2、 "Caterpillar" problem
"Caterpillar" is just a metaphor, which means that when the LED display screen is powered on and there is no input source, a long dark and bright strip appears on some lamp surfaces, mostly in red. The root cause of this phenomenon is the internal chip leakage of the lamp or the short circuit of the IC line behind it. In this case, we only need to hold a hot-air gun to blow hot air along the discolored "Caterpillar" with electric leakage. When we blow to the lamp with problem, the problem will probably be solved. Because the chip with internal leakage was disconnected due to heat, we need to find the faulty lamp bead and replace it. If there is a short circuit in the line of the back IC, you need to use a multimeter to measure the relevant IC pin circuit, and replace it with a new IC.
3、 Color block missing
The missing color block of LED screen repair is that a small block of different color block appears when the LED display screen plays normally. This problem is generally caused by the burning of the color IC controlling the color block. The solution is to replace a new IC.
4. Partial black screen and large area black screen
Usually we talk about a black screen, which means that when the LED display is playing normally, one or more LED modules show the phenomenon that the whole area is not bright. A few LED module areas that do not light up are called partial black screens, and more areas are called large-area black screens. When this phenomenon occurs, we first consider the power factor. Generally, check whether the LED power indicator is working properly. If the LED power indicator does not light up, it may be because the power supply is damaged, and you can replace it with a new power supply of the same power. You should also check whether the power cord of the LED module corresponding to the black screen is loose. In many cases, reconnecting the power cord can also solve the black screen problem.
5, local garbled
The problem of local garbled characters is more complicated, which refers to the phenomenon of cluttered and irregular color blocks that may flicker randomly in the local area when the LED display is playing. When this kind of problem occurs, we usually first check the connection status of the signal line, you can check whether the cable is burnt, whether the network cable is loose, and so on. In the Led display replacement practice, we found that the cable made of aluminum-magnesium wire is easy to burn out, while the pure copper cable has a longer life. If there is no problem with checking the entire signal connection, then exchange the faulty LED module with the adjacent normal playback module, and you can basically judge whether it is possible that the LED module corresponding to the abnormal playback area is damaged, and the cause of the damage is mostly IC problems. , the maintenance will be more complicated.