LED display screens are classified as electronic products according to the industry. As long as they are electronic products, they will inevitably fail during use. So what are some tips for repairing LED display screens?
Friends who have come into contact with LED display screens know that LED display screens are made up of LED modules piece by piece. As mentioned earlier, LED display screens are electronic products, so its basic structure is the display surface (light surface), PCB (circuit board), and control surface (IC component surface).
When it comes to tips for repairing LED display screens, let’s first talk about common faults. Common faults include: partial “dead light”, “caterpillar”, partial color block missing, partial black screen, large area black screen, partial garbled code, etc.
So how to repair these common minor faults? First, you need to prepare the repair tools. The five treasures that LED display repairmen always have are: tweezers, heat gun, soldering iron, multimeter, and test card. Other auxiliary materials are: solder paste (tin wire), flux, copper wire, glue, etc.
1. Partial “dead light” problem
Partial “dead light” means that one or several lights on the LED display screen are not lit. This kind of non-lighting is divided into full-time non-lighting and partial color non-lighting. Generally, this is because there is a problem with the light itself, either damp or the RGB chip is damaged. Our repair method is very simple, just replace it with the spare LED lamp beads provided by the factory. The tools used are tweezers and hot air guns. After replacing the spare LED lamp beads, retest them with a test card. If there is no problem, it has been repaired.
2. “Caterpillar” Problem
“Caterpillar” is just a metaphor, which refers to the phenomenon that when the LED display screen is powered on but has no input source, a long dark-bright strip appears on some lamp surfaces, and it is mostly red. The root cause of this phenomenon is that the internal chip of the lamp is leaking electricity, or the row tube circuit of the IC surface behind is short-circuited, and the former is the majority. In this case, we only need to use a hot air gun to blow hot air along the discolored “caterpillar” of the leakage. When it blows to the problematic lamp, it is generally OK, because the heat causes the internal leakage chip connection to swell, but there are still hidden dangers. We only need to find the leaking LED lamp bead and replace the hidden danger lamp bead according to the method mentioned above. If the row tube circuit of the IC surface behind is short-circuited, you need to use a multimeter to specifically measure the relevant IC pin circuit and replace a new IC.
3. Partial color block missing
Friends who are familiar with LED display screens must have seen this problem, that is, a small square block of different color appears when the LED display screen is playing normally. This problem is generally caused by the color IC controlling the color block behind it being burned out. The solution is to replace a new IC.
4. Partial black screen and large area black screen
Usually, when we say black screen, it means that when the LED display screen is playing normally, one or more LED modules are not lit in the whole area. We call it partial black screen when a few LED modules are not lit, and we call it large area black screen when more areas are not lit. When this phenomenon occurs, we usually consider the power factor first. Generally, check whether the LED power indicator is working properly. If the LED power indicator is not lit, it is mostly because the power supply is 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 wire head can solve the black screen problem.
5. Local garbled code
The local garbled code problem is relatively complicated. It refers to the phenomenon of random flashing color blocks in the local area of the LED display screen when playing. When this problem occurs, we usually first check the signal line connection problem. You can check whether the cable is burned, whether the network cable is loose, etc. In maintenance practice, we found that the aluminum-magnesium wire cable is easy to burn, while the pure copper cable has a longer life. If the entire signal connection is checked, then swap the problematic LED module with the adjacent normal playing module, and basically determine whether it is possible that the LED module corresponding to the abnormal playback area is damaged. The cause of damage is mostly IC problems, and the repair and treatment will be more complicated. I will not elaborate on it here.
