Last month, a shopping mall celebrated its anniversary, and "centipede patterns" suddenly appeared on the large screen of the stage - more than a dozen colorful stripes cut the celebrity's face into pieces. The maintenance master took apart the back plate and patted his thighs straight: "The cables are twisted into twists! "This kind of bad things can actually be avoided. Today I will teach you how to understand the "nervous system" of the display.

1. Secrets hidden in the line location

Friends who have removed the display screen know that the cable is like a blood vessel network that is spread all over the screen. But where is it hidden? Different structures are very different:

1. ​​Box-type screen​​
   Focus on checking four blind spots:

   • Box joints (accounting for 67% of the fault)
   • Power module interface (easy to accumulate dust and short circuit)
   • Peripheral of signal distributor (the most dense harness)
   • Under the heat dissipation hole (high temperature accelerates aging)

2. ​​Soft film screen​​
   The cable movement of this type of screen is very terrifying:

   • 12-18 flexible lines per square meter
   • 5mm bending allowance is required at the turning point
   • The splicing position needs to be 45° beveled

3. ​​Transparent screen​​
   The hardest thing is "visible and intangible":

   • The cable is hidden in the glass mezzanine
   • Need to remove the special negative pressure suction cup
   • Repair cost is 3 times higher than that of ordinary screens

2. Three tricks for fault detection

I will teach you a few tricks to not disassemble the machine to save 80% of the testing fee:

​​Observation method of naked eyes​​

• Regular stripes appear when playing solid color screens
• "Breathing" light and dark changes appear on the screen
• There is a burnt smell at the seams of the border

​​Temperature test method​​
Scan with a handheld thermometer:

• Normal wiring area: 35℃-45℃
• Short circuit cable area: >60℃
• Break circuit wiring area: <30℃

​​Knock Diagnosis Method​​
Tap the screen with a rubber hammer (power control 3-5 nm):

• Make a "click" sound → the cable is loose
• Skip screen → Poor contact
• No response →Motherboard problem

3. Golden Rules for Line Layout

Comparing more than 200 project cases, high-quality wiring layout must be achieved:

Special reminder: The LED wall burning accident in a music festival is because there is no "double loop" design - when the main cable is burned, automatic switching of the spare line within 10 seconds can prevent the entire screen from being black.

4. Repair and save money secrets

The most tricky repair case I have ever seen: I will be charged 8,000 yuan if I change the cable! Remember these three cost points:

1. ​​Material Fee​​

   • Ordinary cable ≤30 yuan/meter
   • With shielding layer ≤80 yuan/meter
   • Flexible cable ≤120 yuan/meter

2. ​​Labor hours​​
   Normal disassembly and assemble:

   • Box screen: 200-400 yuan/square meter
   • Soft film screen: 500-800 yuan/square meter
   • Aerial work + 30% fee

3. ​​Invisible consumption​​
   Must ask:

   • Does it include a 3-month warranty
   • Is there any additional charge for software debugging?
   • Can old cables be recycled at a discount

Recently, I helped my friend to inspect the screen in the conference room and specifically asked the supplier to do a "violent test" - after repeatedly bent the cable 200 times, the signal transmission is still stable. This kind of practical test is much more reliable than looking at the parameter table. So, you can’t just look at the surface parameters when choosing a screen, you have to focus on the details of the cable. After all, the display screen is like a human being, and even the best nervous system problems will be useless!

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