The newly installed LED screen suddenly turned black. I took it apart and saw that the control board was soaked in water - I have seen so many such bad things. Three days before a shopping mall opened last year, the repairman took out a hot control board from the ventilation duct, and the lines were all baked. Today we will talk about this inconspicuous but deadly widget, so that you can avoid getting stuck after reading it.

1. How much is the cost of installing the control board incorrectly?

This thing is like a mobile phone motherboard, and wherever it is installed, it directly affects life span. Last month, I helped customers to inspect the stadium fence screen and found three fatal problems:

1. ​​Double the repair fee​ ​: Installed on the bottom of the screen, and the chip is boiled in water during rainy season (8000+ in a single repair)
2. ​​Performance discount​ ​: Electromagnetic interference caused by approaching the power supply module (color deviation reaches ΔE≥5)
3. ​​Safety hazards​ ​: The thermal dissipation of confined spaces caused spontaneous combustion (the industry has 3 accidents per year)

There is a gym that stuffs the control board into the steel frame column, but the entire frame has to be removed after changing the chip, and the labor cost is 10 times more expensive than the parts. So, choosing the right position can save a lot of money.

2. Comparison of actual measurements of five major gold installation positions

I have traveled to more than 20 projects with a thermal imager and summarized these practical experiences:

​​▎Box mezzanine position (choose this for 55% of items)​​

• Advantages: Dust-proof and collision-proof, no need to disassemble the screen during maintenance
• Fatal injuries: The cooling fan must be installed (internal temperature drops by 18℃)
• Suitable for: shopping mall hanging screens, stage background walls

​​▎Independent control warehouse (must-have for high-end projects)​​

• Access doors should be left (width ≥40cm)
• Install temperature and humidity sensor (500 more cost and 5000 maintenance savings)
• Case: Constant temperature in a curved screen bin at a certain airport 25℃

​​▎Back of the screen (don’t learn it! )​ ​

• Water leakage rate soars by 70% on heavy rainy days
• Electromagnetic interference causes 30% image jitter
• The worst case ever seen: the control board was made into a nest by a bird

Three and three steps to find the installation position

Last month, I guided advertising companies to install window screens. This is how I did:

1. ​​Find out the screen structure​​

   • Top mezzanine is preferred for snap-on box
   • The welding frame must be maintained for maintenance
   • Direct external waterproof box for rental screen

2. ​​Environmental risk assessment​​

   • The altitude of the seaside project should be higher than 3 meters (anti-salt spray corrosion)
   • Install heating film in the north in winter (it will still start at minus 20℃)
   • Install oil filter in the catering area (the oil fume sticks to the heat dissipation hole and is deadly)

3. ​​Future maintenance prediction​​

   • Leave enough 50cm of operating space (you know the master's beer belly)
   • Optimize blind operation with the interface facing outward (save 30% of maintenance time)
   • Apply the maintenance date label (the position must be opened for inspection for more than 2 years)

A customer wanted to hide the control board behind the decorative board, but every time the plaster line was removed, it cost more than 8,000 yuan to repair the wall paint alone.

4. These signals indicate that the location is installed in the wrong position

The control board is voting with its feet, so when these situations occur, you should move your nest quickly:

• ​​Automatically restart in the early morning​ ​(The temperature difference causes the component to shrink)
• ​​Regular stripes appear on the screen​ ​(Typical symptoms of electromagnetic interference)
• ​​Remote control distance shrinks​ ​(Metal frame shielding signal)
• ​​Heat gas is emitted from the heat dissipation hole​ ​(The internal area is over 60℃)

The most bizarre fault I dealt with last week: the control panel is installed in the air conditioner outlet, condensed dew in summer, and baked in hot air in winter, and repaired four times a year. After moving to the side of the distribution box, there was no problem in two years.

Editor's opinion

To be honest, installing a control board is like hiding private money - it must be safe and hidden, and it must be available at any time. I have seen too many projects sacrifice practicality for beauty, and finally the repair fee is enough to buy half a new screen. It is recommended that everyone use the thermal camera to scan after installing the screen, and correct the locations with temperatures exceeding 45℃. The latest industry data shows that projects with scientific control board locations can reduce the maintenance cost of less than 8% of the purchase price in five years, which is more than half of the industry average.

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