When I first entered the industry, my colleagues and I almost disassembled the screen into parts in order to find a control card - who would have thought that this "brain" that directs the entire screen was hidden in a corner that was harder to find than a mobile phone SIM card? It’s funny to think about it now, but let alone newbies, many veterans have fallen into this.

​​The three major stealth techniques of the control card​
Let’s first figure out why the control card needs to be hidden so tightly. Let me tell you a real story: Last year, a shopping mall broadcasts a live event, a naughty child used the exposed control card as a socket for the game console, which directly caused the entire screen to be blacked for 2 hours, and the loss was enough to buy a car. Therefore, manufacturers usually place the control card in three positions:

1. ​​In the box mezzanine​: Remove the access cover in the lower right corner and there is a metal plate with a heat sink
2. ​​The back of the power cabinet​​: Use magnetic suction buckle to fix it behind the distribution module
3. ​​Split seam interior​: Hidden between the connecting snaps of the two screens

I have a cold knowledge:​Control card with waterproof function​​It feels frosted to the touch, don't think it's a used product. This coating can improve moisture resistance by 35%. Laboratory data show that the correct installation of the control card temperature fluctuates by ≤8℃. If it feels hot, it is probably because of the problem of heat dissipation.

​​Tiang card map for different models​​
I have compiled a comparison table to ensure that you follow the map:

Key reminder: When encountering a screen with an intelligent system, first cut off the power and avoid burning the card. Last year, a peer operated with live operation, and the control board chip was directly broken down by static electricity, which was enough to buy 20 new cards.

​These operations are equivalent to giving money to the repairman​

1. Update the program with a normal USB disk (must use an industrial-grade anti-magnetic USB disk)
2. Unplug the data cable with bare hands (will bend the needle, and the rework rate is increased by 62%)
3. Mixed control cards in different batches (screen tear rate up to 89%)

A lesson to teach you bloody tears: a concert used three batches of rental screens, and the control card agreement was not unified, and the singer's close-up face was pulled into Picasso's style. Current industry standard requirements​Control card firmware version error ≤0.2​​, this parameter is ten times more important than the price.

​​Help! What to do if the control card is burned?​​
Don't panic, remember this emergency trilogy:
① Turn off the main power immediately (don’t just turn off the screen switch)
② Remove the control card and blow it with cold air for 10 minutes (don't use a hot air gun)
③ Insert the backup card into the main control bit (the third interface from right to left)

What if your hands shake and pretend to be reversed? The control card interface has a dummy-proof design, and there will be a "click" sound when installed correctly. If you really can't handle it, don't force it. Contact the manufacturer to provide remote guidance quickly. Now the control cards of high-end points support 4G remote debugging, which is three times faster than driving to the site.

There are only eight words to play with the control card:​Stabilized hands, sharp eyes, careful and bold​. Next time I see snowflakes on the screen, first touch the temperature of the control card, then check the firmware version, and finally measure the signal line. Remember this data: a qualified control card can withstand 80,000 hours of continuous work, which is equivalent to opening 20 hours a day, and can be used for 11 years without retirement.

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