Where can the motherboard be hidden to be both safe and efficient?

You may not believe it if you say it.​ ​60% of the failures of LED displays are caused by improper motherboard installation​ ​. A customer complained two days ago that the screen he bought for a large price was black after half a year of use. When he opened it, he saw that the motherboard was soaked in water! Today, let’s break it apart and talk about where to put this core component to be reliable.

Three major iron rules for choosing installation location

​​Q: Is the back or side of the screen installed on the motherboard? ​ ​
It depends on the screen type. ​ ​Rental screens need to be removed quickly​ ​, so the motherboard is hidden in the box mezzanine； ​ ​Outdoor advertising screens are afraid of water accumulation​ ​, it must be raised by 20cm and installed in a moisture-proof cabin.

Remember these three points when selecting a specific location:

• ​​Discrete heat outlet within 15cm​ ​: Use the air duct to actively cool down, and the mainboard temperature can be reduced by 8℃
• ​​Avoid electromagnetic interference sources​ ​: Keep a distance of more than 30cm from the power module (important! )
• ​​Installation with inclination​ ​: Inclined by 5°-8° to prevent dust accumulation. Have you ever seen a tragedy of 3cm thick gray on the main board of a shopping mall?

Waterproof and shockproof hidden design

​​Q: How to prevent salt spray corrosion when installing screens at the beach? ​ ​
Last year, the P4 screen installed in a commercial center in Southeast Asia used these three layers of protection:

1. ​​Nanocoating​ ​: The motherboard surface coating, the salt spray test passed 48 hours
2. ​​Air pressure balance valve​ ​: Automatically adjust the internal and external pressure difference, and water will not enter during typhoons
3. ​​Silicone shock absorbing pad​ ​: 8mm thick gasket can resist 8-level vibration, and the truck passes without any screen

Here is a cold knowledge:​ ​IP65 protection does not equal universal​ ​! The motherboard cabin must be tested separately, and use a smoke pen to circle the seam, and only if it is not leaked at all, it is considered qualified.

Devil details for installation

​​Q: Can you install it by doing it yourself? ​ ​
Unless you are a master, don’t save that little installation fee! Professional engineers bring these artifacts:

• ​​Laser positioning meter​ ​: Ensure the absolute level of multiple motherboards, and reinstall it if the deviation exceeds 0.5°
• ​​Torque wrench​ ​: The screw is just about 8N·m, too tightening will damage the circuit board
• ​​Thermal imager​ ​: Scan immediately after installation, and rework must be done if the temperature difference exceeds 5℃.

Focus on this set of data: the average failure interval between motherboards installed in standard can reach 50,000 hours, which is three times longer than random installations!

Life-saving tips for operation and maintenance

​​Q: How do you find out in advance that the motherboard is about to be hung? ​ ​
Teach you three ways to self-test:

1. ​​Listen to sound and identify position​ ​: Normal motherboard fans have uniform buzzing sounds, and they are in a noise and are repaired quickly
2. ​​Lighting diagnosis​ ​: The status light flashes 3 and stops 1, which is normal, and flashes are alarms
3. ​​Warning warning​ ​: The temperature rise of the shell shall not exceed 15℃ in the environment (it feels slightly hot when touched by hand)

There is a Tokyo project case where an engineer installed temperature and humidity sensors on the motherboard cabin and predicted the fault 3 days in advance, avoiding a live broadcast accident.

I have to say that the motherboard installation is a "heart surgery" for the display. Although many screens are made ultra-thin now, those that can hide the motherboards both hidden and easy to maintain are real skills. Remember, a good screen depends on quality and seven points to install!

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