Oh, are you wondering if this is a matter? A good LED screen suddenly became as red as a monkey butt. What was going on? Last week, I met a hot pot restaurant owner. The advertising screen that had just been installed for two months suddenly turned red in full screen, which scared him so much that he thought it had triggered some alarm system. Let’s understand this today. Please keep in mind that you can become a half-maintenance master after reading it.

​​Look out why this thing turns red first​

To put it bluntly, LED screens are red, green and blue small light bulbs arranged in a row. Normally, the three colors can be mixed with various colors.​​If the green and blue light bulbs go on strike together, will it be the only red ones left to sing a solo show?​. I'll explain the common reasons for you:

1. ​​The plug is more deadly than you think​
   Just like the phone charging cable is poorly contacted, loose DVI cable can directly "color blindness" the screen. According to statistics, 90% of all-red faults are caused by the interface being not inserted. When we installed a curved screen in Singapore last year, the worker forgot to tighten the interface screws, and the entire screen was as red as a traffic light.

2. ​​Control card to get angry​
   This thing is equivalent to the brain of the screen. If the program is exhausted or the hardware is broken, the green and blue signal disappears directly. There is a shopping mall with a large screen full of red. After checking for three days, it was found that the control card was corroded by cockroach urine - it is particularly easy to get infected in the humid areas in the south.

3. ​​Beware of short circuits in modules​
   If a module connected in series is short-circuited, the current will run hard with the red light bulb. Last month, the fence screen at Tokyo Stadium suddenly turned red, and it was later discovered that the sealant in the box cracked and water was poured into it after heavy rain.

​​Do it yourself and go through five steps​​

Don't rush to ask for repairs, follow this procedure first:

​​Step 1: Power off! Power off! Still power off!​​
The components are easily burned when operating with live. Turn off the screen power first and then turn off the computer. Once I saw someone pulling out the plug with electricity, and it was a "bang" sound that smoked directly - I spent another two thousand more to replace the control card.

​Step 2: Check these key parts​

• DVI cables for graphics and sending cards (focus on whether the gold fingers are oxidized)
• Power connector (swing it and hear if there is any loosening sound)
• Control card indicator light (normal green should always be on)

​Step 3: Don't be careless about software settings​​
Sometimes the parameters are messed up:

1. Enter the control system to see if the color mode has been changed to single red
2. Check the refresh rate setting (it is easy to cause trouble if you are below 1920Hz)
3. The white balance value has been adjusted incorrectly (I have seen a ruthless person who zeroes the green value)

​Step 4: Segmented Detection​
If the screen area becomes red, it is probably a problem with a certain module. Replace and test the spare parts one by one, which is much faster than blind repairs.

​Step 5: The ultimate trick - patting therapy​
Don't laugh! There is really a master who uses this trick to find cables with poor contact. Gently pat the screen border. If the red area flashes, check the cables at the corresponding location immediately.

​Don't step on these minefields​

1. ​​Plug-out cable with electric———Control card is scrapped in minutes
2. ​Use alcohol to wipe the circuit board——Residual liquid will cause secondary short circuit
3. ​Unboxing yourself——There will be endless troubles after destroying the waterproof glue strip
4. ​​Continuously adjusting the power supply voltage​——I have seen a 5V to 12V, and the light beads set off fireworks on the spot

​Special Situation Handling Manual​

​Scene 1: It's all red as soon as it's finished​
Most likely, the software configuration is wrong. Last year, the transparent window screen of Seoul Department Store was completely red when debugging, and finally it was found that the signal source resolution was not matched.

​Scene 2: It suddenly turns red as you use it​
Focus on checking the cooling system. After using the screen of an Internet cafe for three years, it was completely red. When I opened it, I found that the fan was two centimeters thick in dust, and the control card was deformed.

​Scenario 3: Local erythema diffusion​
Eighty percent of the module is short circuit in series. For outdoor equipment such as stadium fence screens, it is necessary to check whether the lightning protection grounding is in place.

​Personal experience of blood and tears​

After working in this industry for more than ten years, I discovered a rule:The more you are in a hurry to repair, the more likely it is to make mistakes​. Once I received an emergency repair report from the hotel banquet hall at 2 o'clock in the middle of the night, and I found that a network cable was not tightly inserted. Now there are three magical tools in the toolbox:

1. Precision screwdriver with lighting
2. Multimeter that can measure voltage
3. Alternate DVI adapter

There is also a metaphysical phenomenon - it is particularly prone to full red failure on rainy days. Later I realized that high humidity will cause oxidation of the cable interface. Therefore, now you must apply special anti-oxidation paste for maintenance of the engineering screen.

To be honest, don’t panic when you encounter all red screens. You will definitely be able to save yourself by checking according to the process. If you really encounter chip-level failures, don’t stand it. If you need to find a professional team, hurry up. Technical responses like ours, which are on standby on time, often remotely guide customers to restart the system at 3 a.m.

for more product information and pricing, please contact us .