Xiao Liu, a newly-entered installer, has been in trouble recently - when installing an advertising screen in the mall, the sending card was inserted in reverse, and three receiving cards were instantly burned, and the maintenance fee was directly compensated for half a month's salary. Such bad things are not uncommon in the industry.​ ​Industry reports show that 38% of hardware failures are caused by interface errors​ ​. Today I will teach you step by step to avoid these pitfalls, especially the third move that will help you avoid detours for three days.

1. The machine must be burned if the wrong insertion of these positions

Novice most often fall in these three places:

1. ​​Use the power port as a data port​ ​: The sending card interface is usually in a blue HDMI shape, but some models will be marked with green
2. ​​Misplugging alternate interface​ ​: Don't try the extension port with the word "EXT", this is only used for cascading backup systems
3. ​​Force plugging does not match the version​ ​: The 4K sending card is hardly inserted into the control box of the 2K screen, just like a diesel gasoline truck

A bloody incident occurred at an exhibition last month: a worker plugged the sending card into the RS485 interface of the power supply sequencer, causing the entire motherboard capacitor to explode. ​ ​Remember this iron rule: the one with metal buckle is the main one​ ​, other interfaces that look like alike are traps.

2. The correct slot length is like this

​​Core area: Golden triangle of control box​​
Release the control box cover and find three blue interfaces arranged in a triangle. Focus on the one with the ▲ logo in the middle, this is the true destiny. Here is a cold knowledge:​ ​The slots of high-quality products will have magnetic adsorption design​ ​, you can feel a slight suction force when you are aligned.

​​Hide the mechanism: Send card self-test light​​
After inserting it in place, pay attention to the indicator light: flash red three times first, and turn green and keep light. If the red light continues to flash, quickly pull out the card and check the gold finger - I have seen a magical operation of a customer using an eraser to solve signal problems.

​​Anti-moment design cracking method​​
Now all high-end equipment has physical anti-stopping, but there is still a 15% misplug rate. Teach you a trick:​ ​When the sending card heat sink is facing up, the interface text must be facing you​ ​. It feels like installing a computer memory stick, and it is only in place when you hear the "click".

3. Life and death line before and after inserting the card

​​Three things to do before powering on​​：

1. Use a multimeter to measure the static value of the control box (not touch it if it is > 20V)
2. Check that the sending card version number matches the screen body (the two digits after the decimal point must be matched)
3. Apply special protective grease to gold fingers (data from a major manufacturer: it can reduce oxidation failure by 73%)

​​Five minutes of life and death after inserting the card​​：

• Minute 1: Touch the temperature of the sending card by hand, it is slightly hot, and the power will be immediately cut off when the hot hand is done
• Minute 3: Check whether the screen is flashing regularly (normal is the horizontal stripes refresh every 5 seconds)
• Minute 5: Even if the computer detects new hardware, it is considered successful

There is a real case: the worker directly locked the control cabinet after inserting the card, but found that the next day he was not identified. Later I found out that it was caused by static electricity, so I wiped the interface with an alcohol cotton pad.

Ask and answer

Q: How to remedy if the insertion is reversed?
A: Disconnect the main power immediately! Remove the sending card and let it sit for 24 hours, and there is a 75% chance that it will be saved. Don’t believe in the metaphysical theory of “reverse insertion for five minutes”, as it will completely burn the chip.

Q: Can different brands be mixed?
A: Look at the interface protocol version. Devices after 2020 basically support the HDMI 2.0 general protocol, but it is recommended to use the original card. A customer's mixed use caused serious color bias, and it took three days to solve the problem.

Q: What should I do if the screen is black after inserting the card?
A: First look at the color of the sending card indicator. The red always lights up and needs to be reinstalled. The green breathing state is a signal source problem. If the two colors alternately flash, it will be sent for repair.

Exclusive data: The 2023 maintenance report shows that​ ​Correctly plugging the sending card can extend the life of the device by 2.8 years​ ​. After a chain store replaced the installation process, the annual maintenance cost was reduced by 41%. Remember, precision equipment is not LEGO building blocks, a slight difference will really make you lose a thousand miles.

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