When I first entered the industry, I spent three hours wandering around the Huaqiangbei Electronics Market, but I couldn't tell the difference between a power module and a receiving card - the water in this accessory market is deep enough to feed whales! I heard that a colleague recently bought a batch of "original lamp beads". Within three days of installation, snowflakes appeared on the entire screen. When they were repaired and disassembled, they were found to be refurbished parts... Today we will talk about this procurement problem that makes Xiaobai tremble.

Let’s throw some critical data first: industry reports show that,​ ​70% of display failures are caused by inferior accessories​ ​. But you may not know that some power supplies marked as "new and original" may contain capacitors from five years ago!

​​Don’t step on the three deadly traps​​
The most outrageous case I have ever seen was when someone installed an outdoor screen control card on an indoor device, and it burned down when the rainy season came. Remember these pitfalls:

1. ​​Model is available for ≠​ ​: For example, P3 modules are also divided into 2018 and 2023 models, and the pin definition has been changed in 3 places.
2. ​​Be wary if the price difference exceeds 30%​ ​: The price difference between accessories of the same model through regular channels usually does not exceed 15%.
3. ​​With packaging ≠ genuine​ ​: Counterfeit security codes can now be scanned out of high-imitation packaging

Last month, I helped a friend inspect the goods and found that the waterproof rubber ring of the so-called "IP68 receiving card" was actually made of double-sided tape! This accessory is installed on the stadium fence screen, and a rain can bring down the entire system.

​​Shopping tips used by experts​​
Let me teach you a six-character mantra:​ ​"Check out the test, dismantle, and guarantee"​ ​. Last year, the main screen of an exhibition suddenly turned black because it failed to complete these six steps:

• Look: the solder joints of the lamp beads should be in a full cone shape (inferior products are like squashed dumplings)
• Measure: Use a multimeter to measure the no-load voltage of the power supply. If the fluctuation exceeds ±0.2V, pass it directly.
• Disassembly: The snap-in connector has a 43% lower failure rate than the welding type (data from a testing laboratory)

Here’s a little trivia: A really good module will definitely have four mounting holes.​ ​Oxide insulation layer​ ​. I like to bring a magnet - the aluminum alloy frame that can be attracted is definitely not anti-corrosion!

​​The red and black lists of channels start from the bottom​​
Don't believe in "direct supply from the manufacturer", now even the second-level agents dare to label it like this. Teach you three tricks to spot Li Gui:

1. Ask the other party to provide​ ​Customs declaration form for the month​ ​(All serious imported accessories are available)
2. Check the stamp on the back of the module​ ​Production batch number​ ​, can correspond to the manufacturer’s factory records
3. request​ ​72 hours aging test video​ ​, pay attention to the timestamp in the lower right corner of the video

Let me tell you a real experience: I once bought a batch of "military grade" power supplies on an e-commerce platform, only to find that the thickness of the heat sink was 1.2mm thinner than the genuine product. This shrinking accessory is installed on the rental screen and will provide overheating protection after 8 hours of continuous operation.

​​Why do veteran drivers wear magnifying glasses? ​ ​
Once, I was inspecting goods with the purchasing director and saw him looking at lamp beads with a 30x magnifying glass. Turns out he was counting​ ​Gold wire soldering point​ ​——Genuine lamp beads have 4 symmetrical solder joints, while refurbished parts usually only have 2 crooked joints.

Now comes something even more ruthless: using an X-ray machine to scan the chip structure. An engineering team discovered last year that three different wafers were mixed in the same batch of driver ICs! This thing tells us,​ ​Purchasing accessories is really important to arm yourself to the teeth.​​。

The editor has something to offend: Don't believe in the "three-year warranty". If an accessory has been installed for three months without any problems, it will basically be scrapped. Remember to ask for it next time you purchase​ ​Third-party testing report​ ​, focus on the salt spray test data and the number of temperature cycles - this is the real talisman!

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