Alas, where is this interface? Do newbies who install large LED screens often scratch their heads at the machine? Don't panic, let's go step by step. Yesterday, a milk tea shop owner inserted the control card inverted, and the entire screen flashed like a square dance, and was so anxious that he was sweating - today I will teach you how to avoid these pitfalls!

1. Understand the three basic concepts first

​​1. "The control card is not a real card insertion!"​​
Don't be fooled by your name! This thing is actually a circuit board with a chip, which is usually installed in the maintenance port behind the screen. Focus on whether there is any16-pin cable connectorandDC 5V power port​, these two are its "identity cards".

​​2. "Left or right?"​​
Most models are installed in​The left maintenance warehouse​​, but you need to pay attention to the details:​The side with heat dissipation hole faces out​! There is a cold knowledge: Although the screen can be brightened if installed in reverse, the heat sink will accumulate dust in three months.

​3. "Three things to do before inserting a card"​​

• Turn off the power! 2,000 lamp beads may be burned out with live operation
• Wear an anti-static bracelet, the maximum static electricity of the human body can reach 15,000 volts
• Prepare a PH2.0 Phillips screwdriver, never use an ordinary screwdriver to harden it

Second and fourth steps to complete the installation process

​​1. Find the right warehouse door location​
Outdoor screen view​Waterproof glue strip indentation, Indoor screen searchMagnetic cover plate​. There is a trick: tap the screen with your hands, and the control card holder is behind the dull sound.

​2. Don't make any mistakes in wiring order​
Must pick it up firstPower cord​Insert againSignal line​! I will say important things three times: red + V, black - V! Last year, a gym was connected in the reverse direction, and the capacitor of the control card directly smoked...

​3. Cable anti-screw design​
Pay attention to the cable plugOrange marking tape​To align the triangle symbol of the interface. If it is inserted in reverse, don't pull it hard - press and hold the ears on both sides of the buckle and shake them gently to remove them.

​4. Key points of power-on test​
Turn on the control card power first, and then turn on the screen body power after 5 seconds. If vertical stripes appear, 80% are​The cable is not plugged to the end​. Remember: it is only in place that you hear the "click" sound!

3. How to solve these strange problems?

​"Is the control card normal to get hot?"​
It is normal to have a slight fever, but if you can fry the eggs, you have to pay attention! suggestion:
① Check whether the cooling fan is blocked by the label paper
② Use a thermometer to measure the surface temperature, and report it immediately after exceeding 65℃
③ Clean the heat sink with a brush once a month

​​"Are the screen garbled after a rainy day?"​​
It's probably​Interface OxidationIt's already. Emergency treatment:

1. Remove the cable after power is cut off
2. Wipe the golden fingers with an eraser
3. Apply a small amount of electronic contact lubricant
4. Heat shrink pipe is put on to prevent moisture

​​"Remote control suddenly failed?"​​
Do these three steps first:

• Restart the router (don't laugh, there are really people who haven't turned off the router for three years)
• Check the firmware version of the control card, the models before 2023 need to be upgraded to the driver
• Direct connection test with network cable to eliminate WiFi signal interference

4. Hidden skills that veteran drivers know

​​The selection depends on these three sets of numbers​​

• Control the number of load points of the cartridge = screen width pixel × screen height pixel
• Power supply power = total screen wattage × 1.5
• Signal transmission distance = wire specification × 150 (unit: meters)

​Daily maintenance schedule​

• Daily: Check whether the power indicator light is always on
• Weekly: Use air blow to clean the dust on the interface
• Monthly: Fasten all terminals
• Quarterly: Update control card firmware

​​Tips for upgrading and transformation​
Want to install wireless control in old-fashioned screens? Buy one​HDMI adapter box​Just do it! Please choose a model that supports 3840×2160 resolution. Connect it to the EXT interface of the control card, and the phone can be controlled immediately.

(Suddenly patted your thigh) By the way! Don't believe in "universal control cards". The agreements of different manufacturers are not universal at all. Last year, a customer bought a miscellaneous card with a bargain, but eventually burned the screen worth 200,000 yuan - the repair fee is ten times more expensive than buying a new card!

Now you know where to plug in the card? In fact, the most important thing is to choose the right manufacturer. For those large manufacturers with monthly output of tens of thousands of square meters, the control cards are developed by themselves, and the protocol matching rate is 100%. If you encounter problems that cannot be solved next time, remember that the 24-hour technical hotline is much more effective than Baidu!

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