Alas, does your LED screen always have a color difference? Or the dark zone appears after just six months of installation? Don't rush to scold the manufacturer--​​80% of the display problems actually occur in the detection blind spot after installation​​! Today I will talk to you about where to check the display screen to be reliable.

1. The secret of testing channels: Don’t just look for "original after-sales service"

▍Third-party laboratory: data speaks the toughest

Last month, a shopping mall had a color block gap in the high-definition advertising wall, and the merchants failed to get it done for two weeks. After finding a professional testing agency,​Use a spectral analyzer to detect the fluctuation of the power supply voltage exceeds the standard​, after adjustment, the color accuracy will be immediately restored to ΔE≤3.

​​Why is independent testing recommended?​​

• Not affected by the seller (the screen repairer and the screen seller are not the same group of people)
• Be able to produce bilingual reports in Chinese and English (must be required for overseas project bidding)
• After testing, give the repair plan directly (save to find a repair provider)

▍Door-to-door quick inspection service: the favorite of an anxious boss

Now many institutions have launched "testing car" services, bringing equipment directly to the site:
✅ Preliminary conclusions were drawn in 2 hours (3 days faster than mailing module inspection)
✅ Live detection can be performed (no need to disassemble the screen to affect business)
✅ Synchronously check for installation risks (such as insufficient load bearing of brackets)

Last year, when I was conducting an annual inspection of fence screens for a stadium in Southeast Asia, I found that there were five solder joints inside the seemingly intact box.​​Timely replacement of modules saves 80% of the later maintenance costs​​, this money is worth spending!

2. You can check these parameters yourself

​​Don’t be the boss! Learn to look at these 3 basic indicators​​：

• ​​Brightness uniformity​：
  Download the metering app on your mobile phone (such as Lux Light Meter)
  When measuring the nine-grid area of ​​the screen, beware of the difference > 15%.

• ​​Refresh rate meets the standard​：
  Use the camera shutter to set to 1/1000 seconds to shoot, and the black raceway appears to indicate that the refresh rate is insufficient

• ​Color Reduction​：
  Play standard color card images (can be downloaded online) to see if there is any obvious color shift in the naked eye

Our 24-hour technical hotline has received the most outrageous consultation - the customer said that the newly installed transparent screen turned green, but it turned out that the decoration team installed the green screen background lights in reverse!

3. How to bargain the inspection fee and not be slaughtered

​Remember this quote formula​：
Basic testing fee (500-2000 yuan) + additional fees (such as EMC electromagnetic detection) + report preparation fee

​​Bargaining three consecutive questions​：

1. "Can invoices be issued to deduct taxes?" (both formal institutions support)
2. "Does the re-check count include?" (At least once a free re-check)
3. "Are you given a maintenance manual after testing?" (Save it to check the information yourself)

Recently, I was doing a trick when I was helping a Japanese gymnasium for an annual inspection - I signed up for a three-year inspection contract, and the unit price was cut by 25%, and I also had two free technical training sessions.

4. There are so many tricks in the test report

​​Teaching you to see through moisture in three seconds​​：

• Be careful when writing "enterprise standards" for qualified standards (national standards are the bottom line)
• No information on the detection equipment list (necessary color measurement)
• Pass with a difference of more than 3 days between the date and sampling time (data may be distorted)

A guy who is doing stage rental has suffered a loss - the test report still uses the old standards from three years ago, and all of them are reworked after the implementation of the new national standards.​​The test must also keep pace with the times​！

Personal opinion: Testing is actually an investment

I have been working in the display screen for more than ten years and have seen too many people regard testing as a cost.​​In fact, professional testing is like a physical examination, spending a small amount of money to prevent serious illnesses​​. The five-year tracking data we have done for a curved screen in Singapore shows that the maintenance cost of projects that insist on annual inspections has been reduced by 62%, and the service life is extended by 3.8 years.

Recently, it is even more interesting to deal with the failure of Korean transparent window screens - the detection found that the sensitivity of the ambient light sensor exceeded the standard, and the intelligent dimming system was upgraded, which has now become a new selling point in the mall.​Sometimes there are business opportunities hidden in the problem, it depends on whether you have any keen eyes​​。

(Don't understand the test report? Just take the conclusion page to the technical consultant and mark the key points for you every minute!)

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