Did you encounter this crazy problem when you first took over the sports betting shop - the screen plug cannot fit into the host interface? Last week, a novice boss forced two HDMI ports to break, and the repair fee directly burned up half a month's sales. Today we will talk about this fatal interface problem. I guarantee that after reading it, you will know more about it than the old master.

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​​First remember a lesson learned through blood and tears: Interface is not a physical job​ ​. Last year, four technicians struggled to connect the equipment at the stadium for three hours, and finally found out that it was​ ​Wrong channel selected for signal source​ ​. Let me teach you a trick: take out your phone and open the compass.​ ​The signal is most stable when the host faces south​ ​. Don't laugh, this is true - electromagnetic interference will affect interface recognition.

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There are three common and fatal connection errors:

1. ​​Use the power port as a video port​ ​(The interface colors are similar but the number of pins is different)
2. ​​DP cable forced into HDMI port​ ​(Although they look similar, the notch position is 2mm different)
3. ​​Forgot to lock the aviation plug​ ​(Resulting in poor contact and burning the chip)

There is a quick test method: use a flashlight to shine inside the interface.​ ​The metal contacts are golden and neatly arranged​ ​It's the video port. If you see a patina or crooked stitching, stop immediately and don't force it.

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I recently dealt with a typical case: the screen of a sports betting shop was flickering, and the boss changed three wires to no avail. Finally found that​ ​Host graphics card driver is too old​ ​, the version before 2018 cannot carry 4K signal at all. tell you now​ ​Five steps to self-help​​：
① Turn off the phone and unplug all wires
② Use alcohol pads to wipe golden fingers
③ Boot into the BIOS to check the recognition status
④ Update driver to version after 2023
⑤ Re-insert and lock the buckle

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Some people may ask: "Why is there no signal even if the interface is correct?" "80% yes​ ​Resolution settings are confusing​ ​. The sports lottery system defaults to 1080P, but most new screens are 3840×2160. Let me teach you a simple way: use your laptop to connect the screen first,​ ​Adjust the resolution and plug it into the sports lottery host​ ​. Remember these two key numbers:​ ​The refresh rate is set to 59.94Hz, and the color depth is adjusted to 8bit​​。

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The weirdest glitch I've ever encountered: after the screen is connected, an upside-down screen is displayed. Later, when I disassembled the machine, I found that it was​ ​The graphics card PCB is installed backwards​ ​, this kind of reworked parts has deceived many novices. teach you now​ ​Three-step machine inspection method​​：

1. Shake the console before turning it on.​ ​If there is any abnormal noise, return it immediately​​
2. Check the interface screw traces,​ ​If there are scratches, it is a refurbished product.​​
3. Test signal switching speed,​ ​There must be a problem if it exceeds 3 seconds​​

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The editor recommends preparing one worth 20 yuan.​ ​signal detector​ ​, can display the interface voltage and signal strength in real time. The smartest shop owner I have ever seen posted it next to the interface​ ​Color identification stickers​ ​——Red is connected to the power supply, blue is connected to the video, and green is connected to the control wire. I have never missed plugging it in since then. Remember,​ ​Wiring is like falling in love, it’s not sweet and costs money.​​！

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