​​Hey, you may not believe it​! A shopping mall opened last month, and the 20-meter-long LED was not on. Five engineers struggled for three hours and finally found that the signal cable was inserted into the wrong port! This matter is not new in the industry, and most of the novices are in the matter of finding ports. Today, let’s talk about this seemingly simple but hidden "treasure hunting game".

1. Revealing the Hidden Place of Common Ports

​​1. Grooved area on the back of the box​
Most screens are designed with a hidden interface compartment, which can be seen by lifting the waterproof cover. Focus on three signs:

• ​Power input port​(Red Lightning Standard)
• ​Signal input port(Blue arrow mark)
• ​Signal output port(Green arrow mark)
  A case of a car 4S store shows that the cascading port is correctly found, and the installation time is reduced by 40%.

​​2. Module splicing seams​
Flexible screens often use magnetic suction interfaces, and they can touch the raised contacts along the splicing seam. Remember the formula: "Touch, two, and three rotate", an electrician at a music festival used this trick to connect 32 modules in 10 minutes

​3. Control card centralized area​
Large screens must have a control card cluster, which is usually hidden in the top or bottom of the screen body. Important tips:​Download power first and then operate​! Last year, someone plugged in and fired a whole row of receiving cards at an exhibition.

2. Different ports of different devices

Actual measurement of a certain airport project: using optical fiber interface to transmit, the signal delay is reduced to 0.3ms

3. Bloody and tears lessons from the wrong port

1. ​​Power plug signal port​: Instant sparks and lightning, the repair fee is enough to buy half a new screen
2. ​​Input and output reverse connection​: Causes signal circulation, and the screen has a "ghost" trailing
3. ​​Strong plugging does not match the interface​: A shopping mall forced Type-C into the HDMI port, and the interface deformation maintenance was suspended for two days

4. Teach you the three-step positioning method step by step

​Step 1: Follow the clues​
Looking back along the power line, 80% of the main power supply port can be found. An electrician in a theater created the original "line touching method", and he could find the port location with his eyes closed.

​Step 2: Check the light to identify the position​
When powered on, there will be indicator lights on the port that is working normally:

• Always on red: normal power supply
• Green flashing: signal transmission
• Blue Breathing: Standby

​Step 3: Color plug-in​
Remember the industry's unspoken rules:

• Red head plug power supply (Power)
• Blue header input (In)
• Green header output (Out)

Self-question time

​​Q: Why can’t the computer connect to the large screen?​​
A: Eighty percent of the interface protocol is mismatched. For example, the 4K screen must use DP1.4 or above interface, and HDMI2.0 can only run to a 30Hz refresh rate. A certain e-sports hall suffered a serious shock during the competition due to this mistake.

​​Q: How to deal with port rust?​​
A: Never use sandpaper to grind! The correct way is to spray it with precision electronic cleaner and then blow it away with air. Remember to do coating protection every month for beach projects

​​Q: What should I do if I can’t find the extension port?​​
A: Try daisy chain connection - connect the input port of the next screen from the output port of the last box. A New Year's Eve party used this trick to connect 128 screens

​​My personal opinion​
After eight years of operation and maintenance of display screens, I found a rule:The more anxious you are, the deeper the port is hidden​! It is recommended that everyone use labels to mark them during daily maintenance. Next time, look for the port, remember to bring a strong light flashlight - some manufacturers hide the interface more concealed than the change in their wallet!

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