A very important part of the LED electronic display is the LED unit board. If there is a problem with the unit board, it will directly affect the overall quality of the LED Display! Therefore, how to distinguish the quality of the LED unit board is a problem that the LED Display merchants care about. Here are some common methods for detecting the LED unit board.
1. LED unit board sheet
For low-cost competition, some LED unit board manufacturers use cheap flame-retardant paper boards or single-sided fiber boards as PCB circuit boards for LED lights. Because all glass fiber PCB boards are very expensive. At the beginning, no difference can be seen. Under normal circumstances, it will break due to moisture, ultraviolet damage, oxidation and other reasons within a year, resulting in the entire LED unit board being scrapped. High-quality LED unit boards must use double-sided full glass fiber PCB boards. Although the cost is high, the quality is guaranteed.
2. IC devices
Observe whether the brands of IC devices used are consistent. What type of IC is used, and how many I Cs are used, these are enough to affect the quality of the LED unit board. Some LED Display manufacturers, in order to save costs, will deliberately reduce the number of I Cs when producing cell boards, or mix other brands of I Cs.
3. Lamp beads and chips
The naked eye cannot distinguish the quality of the lamp beads. It can only rely on long-term testing, which is called the aging test by experts. The general practice of LED Display manufacturers is: power on before leaving the factory to check whether the LED Display can work normally, it will not go through a long aging test. Because there are time costs and labor costs.
Check whether there is any missing or wrong placement of components on the patch, and whether there is any short-circuit phenomenon of component pin burrs. Check whether the solder joints of the straight plug-in unit are smooth and round, whether the board surface is clean and tidy, and there is no missing solder. Check the flatness of the luminous dot matrix and the consistency of the ink color.
Three, power-on test
①Electrically test the consistency of the luminous dot matrix;
② Power-on test whether the line drive tube CEM4953 is effectively protected;
③ Power-on test signal transmission capability.