Newbies who have just taken over the installation of LED screens in stores are always confused whether the control computer should be placed at the front desk or in the warehouse? Let’s get to the point today——​ ​The selection of the operating position of the door display directly affects the three-year operation and maintenance cost.​ ​, using vernacular to break down the practical details that the old masters are unwilling to reveal.

The Golden Location Rules for Controlling Computers

​​Waterproof and dustproof is an iron rule​ ​, but don’t think that everything will be fine if you stuff it into a tin cabinet. When installing a screen in a shopping mall in Southeast Asia last year, they put the host into a stainless steel box. As a result, condensation formed inside during the rainy season and burned the motherboard. A truly reliable site selection must satisfy:

• ​​Ventilation and heat dissipation​ ​: Reserve at least 20cm of space for heat dissipation, and the box opening rate is >30%
• ​​Easy to operate​ ​: The straight-line distance from the display screen should not exceed 50 meters. If it exceeds, additional installation is required.​ ​Gigabit switch​​
• ​​Anti-theft design​ ​: The most amazing solution I have ever seen is to pour a concrete box at the base, with only a USB port exposed.

​​Give a negative case​ ​: The convenience store stuffed the computer behind the freezer, causing frequent crashes in the summer. The solution was finally solved by installing an industrial air conditioner, which cost 50% more in electricity bills.

The life and death line of wiring construction

​​Power lines and signal lines must be separated​ ​! This is the truth derived from the lessons of blood and tears:

1. ​​Parallel wiring spacing​ ​: When strong and weak currents are parallel, the distance is >30cm, and when they cross, they form an angle of 90 degrees.
2. ​​Pipe material selection​​：
   • Galvanized steel pipe: suitable for outdoor wall penetration sections
   • PVC corrugated pipe: the first choice for suspended ceilings
   • Metal hose: dedicated to equipment connections
3. ​​Grounding regulations​​：
   • Ground resistance＜4Ω
   • Copper row thickness ≥3mm
   • Keep the grounding point away from sewer pipes and gas pipes

​​Important reminder​ ​: Don’t believe the nonsense that “Category 5e network cable is enough”, the door head screen must be used​ ​Category 6 shielded wire​ ​, especially scenes with large neon lights or electrical equipment nearby.

Hidden levels set by the software

​​Resolution adaptation is a technical activity​ ​, instead of simply selecting 1920x1080:

• For screens with pixel pitch ≤P10, it is recommended that the output resolution be reduced by 20%
• With curved installation, it must be turned on​ ​Keystone correction function​​
• If you encounter screen tearing, first check whether the refresh rate matches (≥1920Hz is the bottom line)

​​Self-question and answer session​​：
Q: Why is the screen still on after the computer is turned off?
A: 90% of the time it’s because the power supply of the control card is not independently controlled, so the wiring needs to be changed and installed.​ ​relay switch​ ​can be solved

Q: What should I do if the remote control is often disconnected?
A: Check these three items:

1. Whether the router enables UPnP function
2. Control whether the software port is blocked by the firewall
3. Is the network delay >200ms?

Nowadays, 5G network control solutions are beginning to become popular in the industry, but according to actual measurements, optical fiber + local control is the most stable. Recently I discovered a new trend: some high-end control systems support​ ​Intelligent brightness memory function​ ​, can automatically save the best parameters according to the ambient light. Don’t underestimate this function, it can save 30% of operation and maintenance debugging fees in a year. The next time you install a screen, remember to ask the manufacturer for a control card with this function. It is definitely worth the money.

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