Master Li, who is new to the industry, connected the cables backwards when installing an outdoor screen last month. As a result, the entire screen flashed like snowflakes like crazy, and it took him five more days to rework it. it made me realize——​ ​The cable interface is the nerve center of the LED screen​ ​, especially when newbies are faced with dense pins, they will fall into a trap if they are not careful.

The secret of where cables are hidden

Disassemble the LED unit board and you will find that​ ​There is a row of silver-white stitches on the front and back sides.​ ​, this is the home of the line. An experienced installer will put a label on the edge of the board and use a marker to mark the signal codes ABCDR1R2. Pay attention! Some manufacturers use different colors to distinguish signal groups. For example, the red line corresponds to the CLK clock signal and the green line tube OE enable end.

There is one here​ ​Lessons of blood and tears​ ​: Never believe in the so-called "universal interface". Last week, I saw someone forcing a 20-pin cable to a 16-pin interface, and as a result, three driver ICs were burned. The correct approach is​ ​Check pin by pin against the signal definition table.​ ​, even half an hour more is better than reworking.

Signal Identity Cracking Guide

The common letter marks on unit boards are actually very particular:

• ​​ABCD​ ​: Scan the control signal to determine the screen refresh method
• ​​R/G/B​ ​: Red, green and blue three primary color data channels
• ​​CLK​ ​: Clock signal, equivalent to the heartbeat of the screen
• ​​OE​ ​: Enable signal, control LED dot matrix switch

Here comes the point! Some high-end screens will have more​ ​GND ground pin​ ​, these silver pins must be connected to the negative pole of the power supply. Last year, a large screen in a shopping mall failed to connect to the ground wire, causing static electricity to breakdown 37 modules, causing a loss of more than 80,000 yuan.

Line layout life and death lines

Power cables and signal cables must​ ​part ways​ ​, this principle must be engraved into the DNA. The most outrageous case I have seen is that someone bundled the 220V power cord and the network cable together. As a result, the electromagnetic interference caused the screen to shake like an earthquake. The correct wiring scheme should be:

1. The power cord runs through the metal frames on both sides of the screen body
2. Signal wires pass through the central trunking
3. Fix with ties every 50cm
4. Leave 10cm margin at the corners

remember​ ​The distance between strong and weak electricity should not be less than 15cm​ ​, this data is the experience value accumulated from countless maintenance orders.

A life-saving guide to connecting the wrong line

What should I do if my hands are shaking and I pick up the wrong phone? Don't panic yet! Turn off the power immediately and check:

1. Does it smell burnt?
2. Check whether the plastic head of the cable is melted
3. Check whether the temperature of the driver IC is abnormal
4. Use a multimeter to measure the resistance to ground

There is a trick: prepare a​ ​Signal test card​ ​, when the wrong wire is connected, the fault light will light up to indicate the wrong type. I heard that the new smart screens can automatically detect the cable arrangement status, and will flash a red light to alarm when there is an abnormality. This is a life-saving tool for novices.

Finally, a little trivia: the wiring of transparent LED screens must go through an "invisible channel". The glass curtain wall screen in a certain brand's exhibition hall hides the cables in a double-layer glass interlayer, which is both beautiful and dust-proof. This design requires custom-made special cables, and the outer layer needs to be coated with anti-reflective coating - so the optional accessories are more important than the screen body. Before installing a screen next time, remember to ask the manufacturer for a copy.​ ​Pin definition diagram​ ​, this thing is much more practical than the installation manual.

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