Does the novice who is just getting involved in LED screens often encounter situations where the screen suddenly does not light up, the color is distorted, or some areas are black? In fact, more than 80% of the faults are concentrated in several key parts. Today I will take you to explore these "fragile points" and teach you how to quickly locate problems.

1. Power system: "cardiac arrest" on the display

The most serious problem with this part is like a fuse at home burning. Common symptoms include​The entire screen is black​、​​The brightness flickers up​, sometimes there will be a buzzing sound. According to industry statistics, such failures can account for about 35% of the total failure rate.

The focus of the investigation depends on these three points:

1. ​Power adapter​: Especially for outdoor screens, it is easy to get into water and short circuit after heavy rain
2. ​Distribution circuit​: Long-term high load operation will lead to line aging
3. ​Voltage stabilization module​: The screen in areas with unstable voltages can easily burn this component

There is a simple way to judge: If the screen suddenly becomes completely black but you can still hear the sound of the device running, it is probably because there is a problem with the power supply. Don't rush to remove the screen at this time, check the basic parts of the plug and socket first.

2. Lamp bead components: "face-saving project" for displaying effects

Have you ever noticed the small black dots on the large screen in the mall? That is a typical manifestation of damage to the lamp beads. This type of failure is particularly obvious and will occur​Local color blocks are missing​、​​Inconsistent brightness​, when severe, the entire area becomes a "mosaic".

Common causes of damage are:

• ​Physical impact​: Bumps during handling and installation (especially rental screens)
• ​​Electric Breakdown​: It is easy to occur in dry environments
• ​​Poor heat dissipation​​: The heat sink behind the lamp beads has severe dust accumulation

Here is a practical tip: use your phone to take a photo mode and face the screen. If you see small dots that are always bright or completely dark, you can basically confirm that it is a problem with the lamp beads. However, it is necessary to remind novices that damage to a single lamp bead will not affect the overall use, and repairs will only be required if the damage rate exceeds 5%.

3. Module connection: invisible "neural network"

A few days ago, a customer reported that the lower half of the circular screen in their gymnasium suddenly stopped illuminating. When I went to the scene, I found that the wiring between the modules was loose - this kind of poor contact problem can account for 40% of daily maintenance.

Key inspection parts include:

1. ​​HUB Connection Board​: This small green board is most likely to accumulate dust
2. ​​Flat cable​: Repeated plugging and unplugging will cause metal contact oxidation
3. ​​Waterproof glue strips​: Aging of the rubber strips on the outdoor screen will trigger a chain reaction

There is a very interesting phenomenon: many module failures are actually "made" by Xiaoqiang. The situation where insects drill into the box causes short circuits, which are particularly common on displays in catering places.

4. Control system: The screen's "brain crashes"

Have you ever encountered garbled screen code and stuttered screen? Mostly the control system is doing it. This part is like the computer's operating system. Once something goes wrong, it will "reach the whole body".

Common failure manifestations:

• ​​Exception of sending card​: The green light does not flash, indicating that the signal transmission is interrupted
• ​​Receive card failure​: It will cause abnormal display in local areas
• ​​Software Conflict​: Different control programs "fight" triggers screen

Here we need to make the point: Do not adjust parameters randomly when controlling system failures! A customer reset the color parameters themselves, and the entire screen became "Avatar Blue", which was three times more repair costs than ordinary failures.

5. Structural components: Hidden "chronic diseases"

Many people ignore the loss of mechanical structure. In fact, problems such as box deformation and rust of brackets, just like human arthritis, are caused by accumulation over time.

Those that need special attention are:

• ​​Quick lock​: Rental screens are frequently disassembled and installed easily and wear them
• ​​Heat dissipation fan​: Ash accumulation will cause the speed to drop
• ​​Waterproof sealing ring​: The outdoor screen must be replaced once a year

Let me tell you a real case: A transparent screen in a shopping mall suddenly fell, and it was found that the bracket screws were vibrating and loosened over the years. This kind of structural hidden danger can be avoided by regular inspections.

6. Those uncommon sense fault points

Finally, let’s talk about some pitfalls that novices are prone to step on:

• ​​net cable crystal head​: It looks inconspicuous, but it is the "primary of throat" of signal transmission
• ​Magnetic suction interface​: Strong magnetic field environment can lead to poor contact
• ​​Electric floor​: Instead, it will accumulate charge and damage the circuit

I remember one time I went to repair the fence screen of the stadium. After checking for a long time, I found that the site sprinkler system had rusted the network cable interface. Such a weird fault, I really can't imagine if I have no experience.

As an experienced driver who has been in the industry for many years, I think looking at LED screen failures is like a traditional Chinese medicine consultation - we must not only pay attention to the surface symptoms, but also consider the use environment. Newbie friends remember this formula: "First check the power supply and second check the wire, the module interface is the key, and the control system is finally tested." If you do these three basic checks in daily life, you can get more than 80% of minor problems by yourself. Of course, when encountering complex problems, you still have to find a professional team. After all, safety is the most important thing?

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