Have you ever experienced such a crazy moment? The new LED is not lit up even though it is not lit. Seven or eight technicians are circling around the screen. The screwdrivers in the toolbox are almost bald, but they just can't find the damn receiving card? Last week, a bar owner complained to me: "I spent 200,000 yuan to install the stage screen, but when I was debugging, I found that the reception card could not be found, so I almost opened the skylight for the performance! "Today we will lift the "coat" of the LED screen and pull out this "heart".

(There is an unwritten rule in the industry: technicians who cannot find a card must invite the entire group to drink milk tea. I have spent a lot of money over the years)

1. First understand what this guy does

To be honest, when I first heard about receiving a card, I thought it was a variant of a bank card. ​ ​To put it bluntly, this is a breathable circuit board​​, specialized in translating video signals into languages that LED light beads can understand. It's going to strike, your screen is either pretending to be mute with a dark face or protesting with you with snowflakes.

Here is a cold knowledge: a receiving card can carry up to 650,000 lamp beads, which is equivalent to commanding five full-scale engineers at the same time. For a giant circular screen in a gym like that, there may be hundreds of "commanders" hidden behind it.

2. Revealing the regular hiding place

Different models of LED screens have the position of receiving cards like a master of hide and seek, but they are inseparable from the essence:

​​1. Assault on the back of the box​​
The design logic of most rental screens is "see when you open the cover":

• Remove the four corner screws from the back cover
• Release the dustproof cloth (don't use brute force to pull it, this cloth is more delicate than your shirt)
• It's the green board with heat sink

There is a classic case: Last year, a shopping mall celebrated its anniversary, and the technician changed the power board as a receiving card three times, but the screen flashed like a disco. Finally, he found that the card was under the dustproof sticker he tore off.

​​2. The side dark lattice lurker​​
For the sake of beautiful shape, some creative screens will plug the receiving screen into:

• Bend grooves of curved screen
• Waterproof silo for floor tiles screen splicing seams
• Transparent screen border mezzanine

I will teach you a trick: hold a strong light flashlight and straverse the edge of the box at a 45-degree angle. When you see the interface holes arranged in a regular manner, it is probably the hidden card.

​​3. Distributed layout master​​
When encountering a super-long and wide screen, the receiving card will become a "guerrilla":

• Share 1 card for every 3-5 boxes
• Serpentine arrangement along the signal transmission direction
• Fixed to the steel structure frame with tie

The most exaggerated case I have ever seen is the 100-meter stage screen of a music festival. 256 receiving cards are hung on the truss like bunches of grapes. When debugging, you have to drive a lift to search one by one.

3. Card search artifact and taboo manual

The experience value I have saved over the years is free today:

​​A set of three-piece tools​​：

1. Magnetic Phillips screwdriver (don't use inferior goods, it's too late to cry if it's slippery)
2. Insulating tape (add the bare wire head first and then do it)
3. Mobile phone camera (turn on the recording mode and reach into the gap to detect)

​​Absolutely taboo three don't​​：

• Do not use metal tools to poke the connector (static electricity will burn the chip)
• Don't operate with electricity (don't ask me how I know the smell of smoke)
• Don't disassemble violently (the pins on the clip are more fragile than the heart of the first love)

Last year, a colleague didn't believe in evil and forced himself to pry the clip with a utility knife. As a result, he marked the 8,000-yuan card worth a scrap iron. The figures on the repair order made him feel hurt for three months.

4. Why is professional installation so important?

When I see this, some old man may want to argue: "Isn't it just a board?" Can't I change it online by myself? "As a veteran, I have to pour cold water on:​ ​The receiving card is not a plug-and-play USB drive​​. The water here is deep:

1. ​​Firmware matching degree​​: Just like the charger of iPhone cannot be used randomly, different batches of cards may not be recognized as the main control
2. ​​Heat dissipation design​​: If the wind direction of the fan you installed is wrong, it will make the clip hot enough to strike in minutes
3. ​​Signal attenuation​​: If the transmission distance exceeds 20 meters, the repeater must be added. The distance error cannot exceed 3 meters.

The most tricky thing is that I once saw a copycat. The appearance is exactly the same as the genuine one. The screen can be bright after it is installed - all the reds are displayed in pink, turning the promotional advertisements into Valentine's Day special.

5. Future trend: Will the slug disappear?

There is a new trend in the industry now:​​Invisible card receiving technology​​. Simply put, it is to integrate this thing into the lamp board:

• Thickness compressed from 3 cm to 5 mm
• Power consumption reduced by 40%
• Support hot-swap replacement

I heard that the latest floor tile screen of a certain brand is directly embedded in the middle of the lamp bead matrix, and can be positioned by just illuminating it with an infrared pen. However, I really don’t dare to touch this kind of high-tech thing without five years of experience.

Next time you encounter a receiving card to play hide-and-seek, don’t rush to scold the manufacturer for designing anti-humanity. Follow this process:

1. Find out the screen model (see the steel stamp on the side of the box)
2. Compare the installation drawings (don't just stick to the crumpled paper with chewing gum)
3. Follow the signal line to check (the position of the head of the line is most suspicious)

If you really can't find it...you know, call the installation team immediately. After all, I may have drunk three cans of Red Bull when I was decorating my home. I must remember to stuff the clip into some corner, right?

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