​​"Why doesn’t my LED screen react after powering on? "​ ​ Xiao Zhang, an electrician in the mall who just joined the company last week, turned around the display five times but couldn't find the switch. Lao Li, an engineer who has worked for ten years, said that​ ​90% of the so-called equipment failures are actually not clear about the opening and closing paths.​​. Today we will dig through the secrets of the switch of the monochrome LED screen. You will be more wise than the master after reading it!

1. The hide-and-seek game in the power warehouse

​​Core pain points​​: 65% of operational errors are found in finding the staggered switch position
​​Practical Manual​​：

1. ​​Outdoor screen is in the lower right corner​​: When facing the screen, there must be a metal cover with a heat dissipation hole half a meter away from the ground on the right hand (don't worry, it's not a mouse hole)
2. ​​Watch the frame of the window screen​​: 86% transparent screen, switch compartment is usually disguised as black decorative strips
3. ​​Rental screen check card buckle​​: Quickly disassembled aluminum-magnesium-zinc box, lifting the snap-on board with the "lightning" logo

​​Blood and tears case​​: Last year, a supermarket installed a promotional screen. Three electricians looked for a four-hour switch and finally found it hidden in the U-shaped groove of the light box bracket.——​​This design is even more hidden than the hide-and-seek champion​​！

2. Three major life and death lines for switching operation

Alas, there is a key point here to knock on the blackboard! ​ ​The switch sequence is reversed, and the maintenance fee is tens of thousands in minutes​​：

1. ​​Startup sequence​​: Power on the control computer first, wait until the system is fully started before turning on the display (interval of ≥30 seconds)
2. ​​Shutdown order​​: Turn off the power supply of the display screen first, then turn off the control device (operating in reverse may burn the driver IC)
3. ​​Interval time​​: The switch operation must be ≥5 minutes apart to allow the capacitor to be completely discharged

​​Thrilling scene​​: The staff of a gymnasium directly pulled the shutter, resulting in a 15% dark area of the P3 fence screen, and repairs cost 58,000 oceans. So,​ ​The power outage is awesome, and the screen repair crematorium​​！

3. Invisible killer of environmental factors

​​Temperature​​：

• Start at minus 10℃ and start with "warm up" first: turn on 50% brightness for 20 minutes
• High temperature of 40℃ requires "reduced burden": every time 5℃ increase, the brightness will automatically be reduced by 10% (only this function is available for smart models)

​​Humidity​​：

• The southern plum rainy season is powered on for 2 hours a day to prevent the circuit board from growing "white hair" (actually copper oxide)
• Before operating in the drying day in the north, touch the iron gate to discharge (the human body's static electricity can break through the lamp beads)

​​True story​​: The dispatching screen at a subway entrance is automatically turned off, and finally it was found that the air conditioner condensed water drips into the switch compartment——​​No matter how high the waterproof level is, it is afraid of artificial rainfall​​！

4. A guide to avoid pits in common misunderstandings

​​Misunderstanding 1​​: The switch is the red button
​​the truth​​: Nowadays, high-end screens use magnetic induction switches (just touch them like wireless charging of mobile phones)

​​Misunderstanding 2​​: Can be repaired immediately if the power is cut off
​​warn​​: You have to wait 3 minutes after closing the gate! The capacitor has 380V, which is enough for people to dance breakdancing

​​Misunderstanding 3​​: The switch position of all models is the same
​​law​​：

• Advertising screen switch is on the right side
• Floor tile screen switch at any corner of the four corners
• Fence screen switch is 1.5 meters away from the ground (anti-touch design)

5. Self-examination and self-study first aid kit

When the switch fails, remember these three tricks to save your life:

1. ​​smell​​: Where does the burnt smell come from? 80% of the problem lies in the power module closest to the taste
2. ​​touch​​: After five minutes of power outage, touch the heat sink. The module with abnormal temperature must be replaced.
3. ​​look​​: The power indicator light flashes rapidly, which means the voltage is unstable, and the slow flashes slowly is a communication fault.

Last week, I helped my friend repair the stadium scoreboard, and I found the fault point by touching the temperature.——​​Sometimes the local method is more reliable than the detector​​！

​​Editor's opinion​​
Finding LED screen switch is like playing room escape——​ ​The key clues are always under the nose​​. Next time you encounter power-up, don’t rush to report repairs and touch three times along the frame of the display. Remember, a qualified switch compartment should feel about 5℃ lower than the body temperature. If it is hot, check the voltage as soon as possible!

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