Are newbies who are new to LED screen installation often confused by the various interfaces? It was obvious that the thread ends were all in line, but there was no signal when inserted. Today we will make this clear——​ ​Choose the type of joint, and the installation fee will be reduced by 30% immediately.​ ​Not bragging.

Interface type determines three-year operation and maintenance cost

​​HDMI, DVI, network port​ ​These common interfaces contain great knowledge. Last year, when they installed screens for a chain of pharmacies, they insisted on using adapters to connect old VGAs, but they burned 3 control cards in three months. Now the mainstream interface is divided into three levels:

• ​​Economical​ ​: RJ45 network port + HDMI, suitable for small screens within 20 square meters (monthly failure rate is 0.3%)
• ​​Advanced type​ ​: SDI+ fiber, preferred for 50-100 square meters of field (transmission distance exceeds 300 meters)
• ​​Military-grade​ ​: OBS two-way interface, dedicated for concert-level large screen (5 times improved anti-interference)

​​Key reminder​ ​: Don’t believe in the nonsense of “universal adapter”. The failure rate of using the transfer solution will triple directly, and it will be seen in three months.

Five major life and death lines for wiring

​​Waterproof treatment​ ​It is the lifeline of outdoor screens, but many people only do superficial skills:

1. Installation of the interface tilted downward by 15 degrees (rainproof backflow)
2. After wrapping 3 layers of insulating tape, heat the shrink tube to seal
3. Replace the waterproof rubber ring before the rainy season every year (cost 50 cents per unit, saving 1,000 yuan in maintenance costs)

​​Electromagnetic interference​ ​This invisible killer is even more terrifying:

• Tin foil must be wrapped at the intersection of strong and weak electric current
• Repeater is required if the network cable length exceeds 50 meters
• Control card distance frequency conversion equipment > 2 meters

​​Lessons of blood and tears​ ​: A supermarket put the controller in the cold storage room, and the electromagnetic interference caused the screen to be lost. In the end, it cost 18,000 more to pull the circuit.

Self-question and answer core questions

​​Q: What should I do if the interface is loose and the contact is always poor? ​ ​
A: Three steps to cure:

1. Replace it with an aviation plug with locking device (cost + 20 yuan per unit)
2. Hot melt adhesive fixing on the back of the interface
3. Clean the oxide layer once a month

​​Q: What should I do if the interfaces of the old and new devices do not match? ​ ​
A: Priority is given to upgrading the receiving card, and don’t buy adapters at a cheap price. Comparison data:

• Transfer plan: Save 2,000 yuan in the initial stage, and spend 5,000 yuan more annual maintenance
• Replace the receiving card: 3,000 yuan more, three years of maintenance-free

Wireless transmission modules are now popular in the industry, but the actual 5G solution is still delayed by more than 8ms, and live broadcasts are still a failure. Recently, a new discovery: the failure rate of smart interfaces with self-test function has dropped by 60%, and it can warn of poor contact 3 days in advance. When purchasing next time, ask the manufacturer more about this type of interface module with prejudgment function, which is absolutely worth the money.

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