Have you ever seen a large screen of advertising that suddenly blacks the screen in the mall? Last week, when a friend held an event, the stage background screen suddenly became a mosaic, and he was so anxious that he looked for the control box all over the room. This incident made me suddenly realize that the "brain" of the LED screen - the position of the control board is so important! Today I will take you to lift the "skull" of the LED display to see where this core component is hidden.

1. The position of the control board

​Just like the computer host is hidden under the desk, the LED screen control board also has its own hidden rules​​. Take common outdoor advertising screens as an example:

• Inside the back of the box (accounting for 65% of the installation cases)
• Column control cabinet on the right side of the display (suitable for large splicing screens)
• Independent waterproof control box (mostly seen in stadium fence screen)

Last year, when a curved screen was installed in a business district in Shenzhen, the engineer deliberately hid the control board in a curved turning point, which was convenient for maintenance and did not affect the appearance. This design reduces screen failure rate by 40% and reduces maintenance time by half.

2. Identify the three characteristics of the control board

​​Don’t think it’s all done if you find the location, you have to know the authentic control board​：

1. ​​Depending on the number of interfaces​​: The standard control board has at least 3 signal input ports
2. ​Touch the heat sink temperature​: The temperature rise does not exceed 20℃ in working conditions
3. ​Check anti-counterfeiting marks​: Regular manufacturers have laser anti-counterfeiting codes

Once I was inspecting the goods for a friend and found that the control panel heat sink was actually plastic! This kind of counterfeit product will be burned out in less than a month, and later it was only after changing to aluminium alloy radiator.

3. Five iron rules for purchasing control boards

​​Buying a control board is more particular than choosing a mobile phone. Remember these pit avoidance guides​：

Especially if you want to play creative splicing, you must choose a function that supports custom resolution. The ground interactive screen of a music festival last year almost caused the dancers to hit the wrong beat due to poor control board compatibility.

4. The technical parameters

​Don't be fooled by merchants, these parameters are the bottom line​：

• ​​Low bright high gray technology​: The grayscale does not decrease at 800cd/m² brightness
• ​Intelligent temperature control system​: Automatic frequency reduction protection for every 10℃ increase in temperature
• ​Dual backup power supply design​: Seamless switching between power off for 0.3 seconds

A transparent screen installed in a hotel in Shenzhen last year, the control panel comes with a light sensor, which can automatically adjust the brightness according to day and night. This intelligent control reduces the average daily power consumption of the screen by 23%, and extends the service life.

5. Life and death speed for installation and debugging

​​Installing a control board is like doing surgery, and one mistake can lead to the whole game.​：

1. Power off first! The probability of burning the plate with live operation is as high as 78%
2. The signal wire should be fixed with anti-pull (the 8-character knot is the most reliable)
3. Must test white balance during debugging (all white pictures are free of variegated)
4. Take videos before sealing the box and keep certificates (defend to later disputes)

In the most exaggerated case, the worker installed the control board inverted, and the screen showed a mirrored screen. Later, more than 30 modules were removed before the correction was made, and the labor cost alone was more than 20,000 yuan.

6. Hidden test points for after-sales service

​​There is something wrong with the control board? These terms of service are to be watched​：

• 24-hour response (less than 30% can be achieved)
• On-site reserves of spare boards (at least 2% redundancy)
• Remote diagnostic interface (saves trouble of disassembling screens)

The screen failed during a Tokyo stadium last year's event, and the service provider brought a backup control board to support it across the sea within 4 hours. This kind of response speed is a truly reliable guarantee.

Speaking of this, someone may ask: Can you modify the control board yourself? Personal advice never! I have seen people who use game console to modify the control board, but the resolution is not up to par, and the picture is as broken as a puzzle. As the saying goes, leave professional matters to professionals, from designing to installation and debugging, every link contains ten years of technical accumulation of skills. Next time you have to touch the control board, remember to find out the manufacturer's details first - do you have your own laboratory? Is the technical team working in three shifts? Is the case library enough for you to copy homework? Only by understanding these can you find the "strongest brain" that is truly hidden on the screen.

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