How to distinguish the quality of led display unit board is a problem that led display business care about.because the quality of the cell plate directly affect the overall quality and performance of the LED display.

How to distinguish good and bad LED unit board? See material

LED unit board plate: Some LED unit board manufacturers to price competition, use inexpensive flame retardant paper plate or single fiber as LED lights PCB board. Because the whole glass PCB board is too expensive. In effect at beginning is no difference, luck can hold two months, eight months, generally within a year will appear rupture because of moisture, UV damage, oxidation and other reasons, leading to LED unit board scrapped. High-quality LED unit board must be double-sided PCB board full glass, although the cost is high, but the quality is guaranteed.

IC: observe IC devices whether the brand consistency. What type of IC, as well as with the number of IC enough to affect the quality of the board. Some businesses, in order to save costs, deliberately reduce the number of IC's when in the production unit, or mixed with some other brands to the IC. IC is different, how to ensure the stability of the performance of the board do?

Lamp beads and chip: just use eyes, it is impossible to distinguish the quality of the lamp beads. Rely on long test, experts say that is aging tests. Generally small workshop practice is power on, check the LED display is not able to work properly, it is not take a long period of aging tests. Because they can not afford the cost of time and labor costs

How to distinguish good and bad LED unit board? Specific inspection method described

Appearance quality inspection of the chosen material

①PCB plates and processing quality;

②IC Device Brand and consistency;

③ LED dot matrix quality;

Check the circuit design of the circuit design specifications, PCB routing in line with the requirements of LED display technology

Check the welding quality

Check whether there are elements leaking patch paste, paste the wrong phenomenon, whether there is a short circuit component pin glitch phenomenon. Check whether direct plug-in joints smooth and mellow, the board is clean and tidy, no Weld weld. Check the LED dot matrix Cartridge flatness and ink color consistency.

Power test (refer to "Performance Test Report" steps)

① consistency of power test LED dot matrix;

② power test of the line drive tube CEM4953 is effectively protected;

③ power test signal transmission capability.