​​What are newbies who are new to LED screens most afraid of? ​ ​
Nine out of ten people will be confused by staring at the dense interface. Last week, I helped a customer debug the stage floor tile screen. Five technicians surrounded the control box for half an hour to find the location to insert the card - and found that the card slot was actually hidden inside the heat dissipation hole! Today we will reveal the rules of these "hidden card points".

1. Positioning guide for three major plug-in card types

​​1. Control card slot​​
• 90% is located in the black module area on the left side of the power distribution box
• With spring buckle design (there is a "click" sound when inserted)
• Focus on looking for metal card holders with the SD logo

​​2. Signal expansion card socket​​
• Mostly distributed within 1cm of the box joints
• Commonly found at the four corners of the cabinet (especially models with curved structures)
• Pay attention to the fool-proof design: the triangular mark is aligned with the protrusion of the bayonet

​​3. Wireless transmission module card slot​​
• 75% integrated on the back of the heat sink above the control card
• It is necessary to open the 2mm thick protective cover
• Special reminder: Those with 5G logo need to activate the communication protocol first

2. Card insertion rules in different scenarios

​​Outdoor advertising screen case​​
The card slot of the P4 curved screen on a highway is hidden in the second layer of the waterproof box:

1. Open the outer rainproof cover
2. Unscrew the four anti-theft screws
3. Lift up the insulating rubber pad to reveal the card slot
   This design reduces the failure rate by 47%, but it takes an extra 20 minutes for a novice to operate it for the first time.

​​Stage rental screen features​​
The card slots of quick-release models are mostly on the inside of the handle:

3. Avoid these operational misunderstandings

​​Misunderstanding 1: Violent card insertion​​
Last week, I saw a customer forcefully inserting a TF card into the SIM card slot, causing the contacts to deform. The correct way is:
① Use your fingernail to gently scratch the edge of the card slot to find the direction of the notch.
② Insert it at a 45 degree angle to 1/3 and then press down

​​Misunderstanding 2: Ignoring fool-proof design​​
A survey of card burn-in accidents on transparent screens in a shopping mall showed that 86% of the damage was due to short circuits caused by inserting the card front and back.

​​Misunderstanding 3: Live operation​​
Important data: Using an electrolytic card will shorten the life of the control chip by 60%. Be sure to cut off the power supply before plugging or unplugging.

4. Question and answer to yourself: What should I do in special situations?

Q: How to deal with a modular screen without a card slot?
A: These new models usually use magnetic plug-in cards:

1. Attach the card to the designated area of ​​the box (with NFC sensing area)
2. Wait for the indicator light to turn from red to green
3. Pairing is complete when you hear a beep

Q: What should I do if mosaics appear on the screen after inserting the card?
A: Check in this order:
① Check whether the gold finger is oxidized (wipe it with an eraser)
② Confirm that the card format is FAT32
③ Re-burn the configuration file (V3.2 or above is recommended)

Now you should understand that you can’t just rely on your eyes to find the card slot. Remember to bring a strong flashlight and mobile phone camera with you for the next installation - use slow-motion mode to record the card insertion process so that you can clearly see the working status of the contact points. If you really can’t find it, don’t force yourself to come. The 24-hour technical hotline is always waiting to rescue you if you are crazy!

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