How to distinguish the quality of LED unit boards is a concern for LED display manufacturers, because the quality of unit boards directly affects the overall quality and performance of LED displays. I will tell you some ways to distinguish the LED unit board.

How to distinguish the quality of the LED unit board? Look at the material

LED unit board material: In order to compete at low prices, some LED unit board manufacturers use cheap flame-retardant paper boards or single-sided fiber boards.

PCB circuit board for LED lights. Because all-glass fiber PCB boards are too expensive. There is no difference in the effect at the beginning. If you are lucky, it can last for half a year or eight months. Generally, it will break due to moisture, ultraviolet damage, oxidation and other reasons within one year, which will cause the entire LED unit board to be scrapped. High-quality LED unit boards must use double-sided all-glass fiber PCB boards. Although the cost is high, the quality is guaranteed.

IC: Observe whether the brands of the IC devices used are consistent. What type of IC is used and how many ICs are used can affect the quality of the board. Some businesses, in order to save costs, will deliberately reduce the number of ICs or mix some other brands of ICs when producing unit boards. Different ICs, how can you guarantee the stability of the board performance?

Lamp beads and chips: You can't tell the quality of a lamp bead from the naked eye. Can only rely on a long test, which is the aging test that experts say. The general practice of small workshops is to turn on the power before leaving the factory to check whether the LED display can work normally, and it will not go through a long aging test. Because they can't afford this time cost and labor cost.

How to distinguish the quality of the LED unit board? Specific inspection methods

Check the appearance quality of the selected material

① PCB sheet and processing quality;

② IC device brand and consistency;

③ quality of luminous dot matrix;

Check circuit design circuit design specifications, PCB layout meets LED display technical requirements

Checking welding quality

Check whether there are missing or misplaced components on the chip, and whether there is a short circuit on the component pin burrs. Check whether the solder joints of the straight insert are smooth and round, and whether the board surface is clean and tidy, and there is no false welding leakage. Check the uniformity of the insertion flatness of the luminous dot matrix and the ink color.

Power-on test (refer to the steps of 'Performance Test Report')

① Test the consistency of the luminous dot matrix when power on;

② Power on test whether the line drive tube CEM4953 is effectively protected;

③ Power on test signal transmission capability.

LED display merchants, open your eyes! Rejecting cheap and low-grade goods, quality is king.