Have you ever stared at the cool LED screen in the mall and stared at it? The picture is obviously switched to smooth flow, but I just can't find where the "brain" that controls it is hidden. Last year, I helped my friend celebrate the mall anniversary, but because I couldn't find the controller, the screen was full of rushing. Finally, I found it hiding behind a fire hydrant - I can laugh at him for three years!

​​1. What does the controller look like?​​

Let me show you a real comparison: the controller is usually a black box the size of a palm, with seven or eight network cable interfaces and USB sockets. Focus on these three characteristics:

1. ​​Blue indicator light​​Flashing (indicates that data is being transmitted)
2. ​​Metal heat sink​Hot to touch
3. ConnectedThe thickest power cord(The main control is the one powered by 220V)

Last year, the main stage of a music festival suffered a loss - I used the split controller as the main controller for a long time, but the result was that I was not in a big way to death. Therefore, identifying these three characteristics can save half of the inaction.

​​2. The rules of hiding in different scenarios​​

​​This is how outdoor advertising screens are found​：

• 90% of the controllers are hidden in​The right side of the screen body​in, about 1.5 meters above the ground
• Shopping mall facade screens love to use​Invisible hatch​, please see if there is a metal flip cover with a lock
• Go to the arc screen​Reinforced column at corners​Touch, there is usually a equipment cabin

​​Stage rental screens are of particular concern​：

• The controller that quickly disassembles and assembles the screen is often integrated into​The slot on the back of the box​
• The controller of the floor tile screen may be​Stage edge wiring wells​, Must check if the reflective strip is attached to the waterproof box
• The most amazing thing I have ever encountered - the controller disguised as​Speaker amplifierPlace next to the mixer

​​Special points of transparent window screen​​：

• 86% transparent screen, the controller must beBottom load bearing beamThe dark square
• Shopping mall atrium hanging screen like​Ceve maintenance channel​, remember to bring a telescopic ladder
• When encountering spliced ​​special-shaped screen, focus on checking​​Reinforcement frame at the splicing seam​​

​​3. Three life-saving moves for failed positioning​​

Last month, I encountered the controller missing while helping a certain exhibition. I personally tested the effective method:

1. ​Follow the clues​: Walk along the network cable at the edge of the screen, and you must see the controller within 10 meters
2. ​Thermal imaging scan​: Use the thermal imager to find the heating source for 20 minutes after turning on the machine, and find the ones right
3. ​​Power cut-off inspection​: Turn off the air switches in the suspected area one by one, and it will be the one that will cause the screen to be black when the shutdown is closed.

I remember one time in the gym, the controller was actually hidden in​The back of the scoreboard​​! So, think about it when you can’t find it - where is the installation master’s favorite choice when he is lazy.

​​4. Three taboos when setting​

1. ​Don't believe in the so-called "universal password"​: 168 entry-level passwords have long been eliminated, and now they use dynamic verification codes.
2. ​​Don't pull the brightness up​: The maximum brightness of the outdoor screen with 7500cd/m², and the lamp beads are burned for three months
3. ​​Net cable should not exceed 100 meters​: If you exceed this distance, you will lose frames. Adding a repeater can solve it.

The most outrageous operation I have ever seen - someone changed the "refresh rate 1920Hz" in the controller parameters to "2500Hz", and the screen body was directly overheated to protect it. Remember, the higher the parameters, the better!

​​5. Cold knowledge that experts only know​

1. BringIntelligent brightness adjustmentThe controller can automatically switch mode according to ambient light, saving 30% power than manual adjustment
2. All really useful controllers are supported​Mobile APP monitoring​, view temperature, voltage and other data in real time
3. Remember to update before the rainy season comes​Moisture-proof firmware​, this hidden function can reduce the risk of short circuit by 80%.

Last year, a cross-border project relied on the third item, which saved a whole landscape screen worth tens of millions during the typhoon season. So, the controller is not done just after installation!

Next time, if you cannot find the controller, take a deep breath and recite "right rear, heat source, thick wire" three times. Really can't handle it? Just find the manufacturer to respond 24 hours a day - professional matters should be left to professionals, right?

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