LED displays are electronic products. As long as they are electronic products, they will inevitably fail during use. So what are the tips for repairing LED displays?
Friends who have been in touch with LED displays know that LED displays are spliced together piece by piece of LED modules. As mentioned earlier, LED display screens are electronic products, so its basic structure is the display surface (lamp surface), PCB (circuit board), and control surface (IC component surface).
Speaking of tips for repairing LED displays, let's talk about common faults first. Common faults include: partial "dead lights", "caterpillars", partial missing color blocks, partial black screens, large black screens, partial garbled codes, and so on.
So how to repair these common glitches? First, prepare repair tools. Five pieces of treasure for the maintenance worker of LED display: tweezers, hot air gun, soldering iron, multimeter, test card. Other auxiliary materials include: solder paste (tin wire), flux promoting, copper wire, glue, etc.
1. Partial "dead light" problem
Local "dead light" refers to the fact that one or several lights on the lamp surface of the LED display are not bright. This type of non-brightness is divided into full-time non-brightness and partial color failure. Generally, this situation is that the lamp itself has a problem. Either it is damp or the RGB chip is damaged. Our repair method is very simple, just replace it with the factory-equipped LED lamp beads. The tools used are tweezers and hot air guns. After replacing the spare LED lamp beads, use Test the test card again, if there is no problem, it has been repaired.
2. The "caterpillar" problem
"Caterpillar" is just a metaphor, which refers to the phenomenon that a long dark and bright bar appears on part of the lamp surface when the LED display is powered on and there is no input source, and the color is mostly red. The root cause of this phenomenon is the leakage of the internal chip of the lamp, or the short circuit of the IC surface tube line behind the lamp, the former is the majority. Generally, when this happens, we only need to use a hot air gun to blow hot air along the leaking "caterpillar". When it blows to the problematic lamp, it is generally OK, because the heat causes the internal leakage chip to be connected. It has been opened, but there are still hidden dangers. We only need to find the leaking LED lamp bead, and replace this hidden lamp bead according to the method mentioned above. If it is the short circuit of the line tube on the back side of the IC, you need to use a multimeter to measure the relevant IC pin circuit and replace it with a new IC.
3. Partial color blocks are missing
Friends who are familiar with LED displays must have seen this kind of problem, that is, a small square of different color blocks appears when the LED display is playing normally, and it is square. This problem is generally that the color IC behind the color block is burned. The solution is to replace it with a new IC.
4. partial black screen and large area black screen
Generally speaking, black screen means that when the LED display screen is playing normally, one or more LED modules show the phenomenon that the whole area is not bright, and the area of a few LED modules is not bright. We call it a partial black screen. We call more areas. It is a large black screen. When this phenomenon occurs, we generally consider the power factor first. Generally, check whether the LED power indicator is working normally. If the LED power indicator is not bright, it is mostly because the power supply is damaged. Just replace it with a new one with 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.
5. partial garbled
The problem of local garbled codes is more complicated. It refers to the phenomenon of random, irregular, and possibly flickering color blocks in a local area when the LED display screen is playing. When this kind of problem occurs, we usually first troubleshoot the signal line connection problem, you can check whether the flat cable is burned, whether the network cable is loose, and so on. In the maintenance practice, we found that the aluminum-magnesium wire cable is easy to burn out, while the pure copper cable has a longer life. If there is no problem in checking the entire signal connection, then exchange the problematic LED module with the adjacent normal playing module, 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 process will be more complicated. I won’t go into details here.
Post time: Nov-19-2021
