What are the most feared by newbies who have just taken over advertising screen maintenance? Eight out of ten people will tell you--the fatal recovery switch cannot be found! Last week, we helped our friend repair the shopping mall advertising screen. We fumbled behind the screen with a flashlight for two hours, and finally found that the switch was actually hidden... (Sold a close first) Today, we will take you to understand the hiding rules of these "mechanisms".

1. Three major hiding places for restoring switches

Many masters say that finding switches is like playing escape room, but to be honest, 90% of models cannot escape these three positions:

​​1. Control card back groove​​
There is usually a toggle switch with arrows on the back of this small black box (the main control board displayed on the management screen). There is a cold knowledge: some outdoor screens will be specially waterproofed, and coins are needed to turn the switch - a billboard on a highway failed last year, and the maintenance team relied quickly with this method.

​​2. The side of the power box is dark​​
Open the power distribution box and pay attention to whether there are red-marked rotary knobs on the side. Here is a reminder for novices: Some manufacturers will use anti-theft screws to fix them, remember to prepare a hexagon wrench. A shopping mall case showed that the construction party mistakenly put a warning label on the recovery switch, resulting in three hours delay in investigation.

​​3. Box snap-in mezzanine​​
Especially for the magnesium alloy box of the rental screen, the switch is often hidden on the second layer of the snap structure. There is a trick: slide your fingers along the splicing seam of the box, and when you touch a position with obvious bulges, it is most likely where the switch is located.

2. Switch layout rules for different scenarios

The most outrageous situation I have ever encountered is that the switch is installed on the top of the screen - it takes a ladder to touch it! To avoid this embarrassment, remember these rules:

​​Outdoor advertising screen​​
• 80% installed in the waterproof control box (1.5-1.8 meters above the ground)
• 15% integrated in the power plug position (requires unplugging and rotates)
• 5% use wireless remote control (beware of signal interference problems)

​​Stage rental screen​​
• The switches for quick disassembly and assemble the box are mostly inside the handle
• The switches of the floor tiling screen are often around the bottom heat dissipation hole.
• When encountering models with arc-shaped structures, focus on checking the joints of curved surfaces.

3. Emergency handling guidelines

When the screen appears with a blank or black screen, don’t rush to find the switch! Follow this process to operate more efficiently:

1. Observe whether the power indicator light is normal (the green light is always on/flashing)
2. Check whether the signal cable connector is oxidized (alcohol wipes the contacts)
3. Confirm the communication status of the control software (ping command test)
4. ​​at last​​Start the recovery switch again

There is an important data: statistics from the professional maintenance team show that 62% of the so-called "recovery switches" faults are actually caused by poor network cable contact.

4. You need to know these design routines

Why do manufacturers hide the switch so hidden? After talking to the engineer, I found out:

• Anti-touch design (avoiding the audience or cleaning staff)
• Waterproofing requirements (outdoor screen must meet IP65 protection)
• Beautiful considerations (especially transparent screens and window screens)

Recently, I have also seen an innovative design: a recovery switch with fingerprint recognition, which must be triggered by the maintenance personnel pressing a specific angle. However, this high-end configuration is currently mainly used on the fenced screens of stadiums.

5. Self-question and self-answer: What should I do if I can’t find the switch?

Q: What should I do if I searched all possible locations but still didn’t find them?
A: Try these two tips:
① After power off, press "Menu Key + Confirm Key" for 10 seconds (applicable to 80% control system)
② Ignite the seams of the box with a strong light flashlight and find micro holes with △ marks (a toothpick may be triggered)

Q: The screen becomes darker after pressing the recovery switch?
A: This situation may trigger the energy saving mode, and the quick toggle switch can usually be reset 3 times in succession. Last year, the advertising screen at a subway station was misjudged as a hardware failure because of this design.

The editor finally said the truth: Instead of memorizing the switch positions, it is better to let the construction party mark the drawings clearly during installation. After all, the structure of each screen is different. The most exaggerated case I have ever seen - the recovery switch is actually hidden in the screw hole of the LED module!

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