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The composition of full-color LED display is composed of the most basic LED unit board. If the unit board has problems, it will directly affect the display effect of the whole LED screen, such as the common color difference area or black screen phenomenon! At this time, how to detect and distinguish the LED display unit board is very important, and it has become the concern of many LED display manufacturers

1. LED unit board

In fact, in order to compete with customers at low price, many manufacturers now use cheap flame-retardant paper board or single-sided fiberboard as PCB of LED lamp. It doesn't make a big difference for people who don't know how to use it. After using it for nearly half a year, it is easy to be damaged by moisture, ultraviolet radiation, oxidation and other fracture problems. In this way, it is easy to lead to the waste of the whole LED unit board. Good LED display unit board uses double-sided full glass fiber PCB board, although the cost will be relatively higher, but it will be more guaranteed.

2. IC devices

Whether the brands of IC devices are consistent. Or with what model and how many IC, will also greatly affect the quality of LED unit board. In order to save the cost, some LED display manufacturers often deliberately reduce the number of ICs when they produce cell boards. Moreover, they mix other brands of ICs.

3. Led beads and chips

The naked eye can not distinguish the quality of the lamp beads, only by a long time of testing to distinguish. General informal LED display manufacturers, products will be powered before leaving the factory, check whether the LED display can work normally, but will not go through a long time aging test, after all, a long time aging test will affect the cost and labor costs. As a brand manufacturer of LED display screen in Shenzhen, liheli has strict production and quality inspection process. Before the products are shipped, the aging test should be conducted for at least 96 hours to ensure that each product can be delivered to the customer intact.

4. Welding quality

Check whether there is missing or wrong sticking of components, and whether there is burr and short circuit of component pins. Check whether the straight plug-in solder joint is smooth and round, whether the board surface is clean and tidy, and whether there is no false or missing welding. Check the uniformity of the insertion flatness and ink color of the luminous dot matrix.