"Who should I look for if the LED screen I just bought is frivolous?" This matter is troublesome. Last week, I heard from my fellow traveler Lao Li that there was a vertical line in the P4 screen in his store. I found a roadside stall to repair it, but the more I repaired it, the worse it was - the original 20% of the bad points spread to 60%! Today, let’s talk about the repair industry, so that you can avoid going astray after reading it.

1. Comparison of the three major options for maintenance channels

Let me tell you a big truth first: the maintenance effect depends on the technology and the accessories. There are only a few common maintenance paths on the market. Let’s use data to speak:

To give a real case: A shopping mall had a large screen black screen last year and was looking for a third-party repair. The master said it was a power supply problem, but it was still not good if I changed three. Finally, I found that the receiving card's firmware does not match, and I spent 28,000 yuan in vain.​Key reminder: The maintenance party is required to provide a "Fault Diagnosis Report" and start construction again, which can avoid 50% of the pitfalls​​。

2. Self-testing guide for common faults

Don't rush to find someone, you can check some problems yourself:

1. ​​The full screen does not light up​: First touch the temperature of the power box, 80% of the hot ones are short circuits
2. ​Partial color blocks​: Use grayscale test diagram to check, vertical lines are mostly line problems
3. ​​Flashing and shaking​: Take a slow motion of the mobile phone, the regular ripple is mostly due to the error in refresh rate setting

There is a trick: send videos of the fault phenomenon to three repairers. If the diagnosis results are varied - congratulations, you have encountered two knives!​​Remember the formula: check the power supply and look at the wires, test the signal and check the electricity, check the five dust and six firmware​。

3. The tricks in the repair quotation

The maintenance fee is very deep, so you must avoid these pits:

• ​​"Unit price maintenance package"​​: It is agreed that 3,000 yuan is included, but it is said that you will change the driver card and increase the price by 8,000 yuan.
• ​"Imported Accessories" routine​: Sell the refurbished parts as originals, and the price difference can be 3 times
• ​​"Hours are calculated separately"​​: Change the lamp bead to charge 8 hours of labor, but in fact, it only takes half an hour

I will teach you a ruthless trick: I require the maintenance plan to be divided into three parts: inspection fee, accessories fee, and labor fee. Last year, a company in Suzhou operated like this and cut the total quotation from 12,000 to 6,800.​​The key is to see whether the accessories quotation is included in batch code. Only those who can check the authenticity on the official website are reliable​​。

4. Core accessories replacement principle

Some parts must be made of original parts, don’t believe the nonsense of “using substitutes like”:

• ​Receive Card​: The agreements of different manufacturers are not universal, and mixed use will burn chips
• ​Power supply module​: If the output voltage error exceeds 0.5V, you have to change to the original one.
• ​​Light bead driver IC​​: The refresh rate of replacement parts is up to three months

Lessons from blood and tears: A bar in Guangzhou uses cheap pictures to replace lamp beads, but the color temperature difference of 300K in three months. During the performance, the audience complained that the screen was "green". Finally, it was completely disassembled and remade, and the loss was 120,000 more than using original parts.​​Remember: Key accessories must have original anti-counterfeiting code​​。

5. After-sales guarantee is discussed

Don't rush to pay the final payment after repairs. These items must be written into the contract:

1. ​​Fault reproduction package rework​: The same problem is re-repair for free within three months
2. ​​Free accessories during the warranty period​: Clearly list which accessories packages to change
3. ​Response time penalty​: Timeout is not processed and liquidated damages are deducted daily

An exhibition company in Beijing suffered a loss - a new failure occurred after repair, and the other party argued and refused to admit it. Later, they added the clause "full-screen detection and comparison before and after repair" to the contract, and the success rate of rights protection was directly raised to 90%.​​Point: Leave at least 20% of the warranty for the final payment​​。

6. These situations are recommended to be scrapped

Don’t be reluctant to leave, some screen repairs are worse than changing:

• ​​Light beads have a light decay of more than 30%​: The initial brightness cannot be achieved after the repair
• ​​The box deformation exceeds 3mm​: It will not take long to repair it
• ​Motherboard chipset discontinued​: Matching accessories not found

There is a reference value: if the repair fee exceeds 40% of the new screen price, you should consider replacing it. Especially for old screens that have been using for more than 5 years, barely prolonging their lives can easily make things happen.​​Remember: Safety is more important than saving money, and cases of leakage and fire are uncommon​。

To be honest, repairing LED screens is like seeing a doctor - finding a good doctor is luck, and finding a reliable repair provider depends on your eyesight. Personally, I would like to choose original service for large screen repairs. Although it is a bit expensive, it is worry-free. If you really want to find a third party, be sure to check these three things: repair case video, accessories purchase channels, and engineer qualification certificate. Finally, I would like to remind you: When you see someone who uses "German technology" and "military quality" as a gimmick, run away quickly!

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