Do you often encounter this situation? I just took over an LED screen and wanted to debug the content. I looked through the manual and couldn't find the control card model number. Last month, I helped a friend deal with a black screen problem on a shopping mall advertising screen. Three people searched around the device for half an hour - and finally found the model label stuck in the gap on the back of the card. At that time, I was so angry that I slapped my thigh. Today we will talk about this seemingly simple but crazy problem.

​​Why is the control card model harder to find than the WiFi password? ​ ​
To put it bluntly, the control card is like the brain of the LED screen. It determines whether your screen can play 4K videos and whether it supports mobile phone control. However, many manufacturers hide the control card in the design for the sake of aesthetics.​ ​Inside the heat sink​ ​or​ ​Modular seams​ ​inside. Last year's industry survey showed that 37% of maintenance delays were due to the time lost in finding the model.

90% of people don’t know the three must-check locations

When I first entered the industry, my master taught me: Rather than searching blindly, it is better to investigate systematically. Focus on these three places:

1. ​​Metal case back​ ​: Use a strong flashlight to illuminate the gaps in the heat sink. Some models will use a laser to engrave the surface of the aluminum alloy.
2. ​​Next to the power cord interface​ ​: Pay attention to the cover with snap-on design, you may be surprised when you open it.
3. ​​Control software interface​ ​: After connecting to the computer, the complete model number is usually displayed in System Information-Hardware Configuration.

Last week I dealt with a stage floor tile screen, and the model code was actually hidden in it.​ ​LED lamp bead matrix​ ​The third row and seventh column can only be seen clearly with a microscope. So, if you can't find it, don't pry it hard, as it can easily damage the cable.

The secret in the model number

Don't be confused when you see codes like "HX-6A3", there is actually a secret behind it:

• initials represent​ ​Communication protocol​ ​:H=HUB type, X=support wireless transmission
• The middle number is​ ​Loading points​ ​:6 means a single card controls 600,000 pixels
• The last letter indicates​ ​Refresh rate level​ ​：A=1920Hz，B=3840Hz

For example, if you want to make a concert stage screen, choose​ ​With A/C at the end​ ​The model can avoid water ripples under high-speed cameras. This is particularly important - last year, a music festival received complaints from viewers because the wrong model was selected and streaks appeared on the live broadcast screen.

Comparison table of old and new control cards

I have compiled the key parameters of common models. Newbies recommend collecting them:

Pay attention to the brightness adjustment column. Now high-end models can adjust according to​ ​Automatic adjustment of sunlight intensity​ ​, the outdoor screen can be opened up to 7500cd/m² during the day without being dazzling. This function is particularly practical for shopping mall window screens.

Common misunderstandings inventory

I have listed the most common pitfalls for novices:

1. ​​thought to be common to all control cards​ ​: In fact, different brand protocols are incompatible, and forced installation will burn the chip.
2. ​​Ignore firmware version​ ​: Many cards before 2020 do not support HDR video decoding
3. ​​Just look at the price and ignore the interface​ ​: The transmission rate difference between HDMI2.0 and HDMI2.1 interfaces is 4 times

There is a particularly typical case: a gym installed an interactive floor tile screen. However, because the control card model did not support multi-touch, external sensors could only be temporarily installed, resulting in a budget overrun of RMB 20,000.

​​Editor's opinion​​
It is recommended that if you encounter an ambiguous model number, please contact the equipment provider directly.​ ​Hardware topology diagram​ ​. Now regular manufacturers will provide electronic drawings, which is much more reliable than looking for labels with the naked eye. Don’t panic if you really can’t find it. Take photos of the front and back of the control card. Many technical support staff can determine the model by looking at the wiring on the circuit board. I relied on this trick to help my customers save three on-site inspection fees.

for more product information and pricing, please contact us .