Alas, a guy who opened a gym asked me last week: "Where should I connect this processor to the LED large screen and screen projector I just bought? "This made me ask so hard that I slapped my thighs. Now, eight out of ten people who are engaged in LED display systems are stuck at the device connection level. Today we will break it apart and talk about this matter. We will save tens of thousands of dollars after reading it.

First understand these three "iron triangles""

Building an LED screen projection system is like building blocks.​​Screen projector, processor, display​​All three components are indispensable:

• ​​Screen projector​​: Responsible for transmitting the screen of your mobile phone and computer, like a delivery guy
• ​​processor​​: Add special effects to the beauty of the picture, just like a chef processing food
• ​​Display​​: The terminal that finally presents the picture, which is equivalent to the mouth of a diner

The key point is here! ​ ​The processor must be connected between the screen projector and the display​​, if this order is reversed, the picture is like a rotten food being put on.

Connecting practical four-part (hand-on teaching)

1. ​​Choose an interface to be of equal status​​
   There are four mainstream interfaces now:

   • ​​HDMI 2.0​​: Supports 4K@60Hz, a must-have for live classes in the gym
   • ​​DVI-D​​: The image quality is non-destructive but large in size, suitable for fixed installation
   • ​​Type-C​​: The laptop is directly connected to the magic weapon, and the transmission speed reaches 40Gbps
   • ​​Wireless screen projection​​: The transmission distance of 5G band is 50 meters, the first choice for conference room

2. ​​The wiring sequence cannot be messed up​​
   The correct process is:
   Screen projector output port → processor input port → processor output port → display screen receiving card
   Last year, a customer connected the processor inverted, and the 1080P class schedule showed mosaic quality.

3. ​​The parameter settings must match three times​​

   • ​​Resolution​​: The processor output must be consistent with the physical resolution of the display screen
   • ​​Refresh rate​​: It is recommended to ≥1920Hz, otherwise it will be full of water ripples when taken.
   • ​​Color gamut space​​: NTSC starts at 92%, otherwise the coach's red robe can be displayed in pink

4. ​​Double insurance is required to prevent interference​​

   • The power cord should be separated from the signal cord, with a distance of at least 20cm
   • The network cable should use a super six-class cable with a shielding layer
   • Wireless screen projection should avoid microwave ovens and Bluetooth devices in the 5.8G band

Lessons from blood and tears: Three fatal mistakes

Recent acceptance discoveries​​Three deaths​​：

1. Use ordinary HDMI cable to run 4K signals (the minimum 18Gbps bandwidth version 2.0)
2. The processor does not connect to a heat dissipation base (high temperature will cause color drift)
3. Wireless screen projection without password (advertising is broadcasted by a milk tea shop next door)

Let me teach you some tips for testing:​​Take a mobile phone to take a slow motion video on the display​​, If you see the scan line jumping up and down, quickly check the processor's synchronization signal settings. A gym chain avoided 30% of customer complaints last year.

Maintenance and cold maintenance knowledge

Don’t look at the simple connection, follow-up maintenance is the highlight:

• ​​Must do every week​​: Check the oxidation of the interface (use alcohol cotton pads to wipe the gold fingers)
• ​​Must check every month​​: Processor firmware upgrade (the new version can improve decoding efficiency by 20%)
• ​​Must-test every quarter​​: Signal attenuation value (if it exceeds -3dB, the line must be changed)

There is a real case: the fenced screen in a stadium in Tokyo does not have regular maintenance interfaces, and the maintenance fee will be 40% more expensive than the new installation in three years.

Personal advice

When buying equipment, don’t make up for cheap sets! I have seen too many merchants use low-end processors to match high-end screen projectors, and the result is that 4K transmission becomes 720P. Three-point guide to avoid pits:

1. Manufacturer is required to provide​​Device compatibility list​​
2. On-site test​​Extreme environmental stability​​(For example, turn on the air conditioner and blow the cold air hard)
3. It states in the contract​​Color deviation value ≤3%​​

Finally, I would like to remind novices: the latest processors now have AI image quality optimization, which can automatically match the display needs of different scenarios such as gyms and shopping malls. This kind of smart device is 15% expensive in the early stage, but the operation and maintenance cost in three years can be saved by 30%. This account must be calculated clearly!

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