The LED unit board plank: some of the LED unit board manufacturer for low price competition, use cheap flame retardant paper board or single fiber board as the LED PCB circuit board. Because, all fiberglass PCB is too expensive. Don't see a difference on start effect, lucky can last six months, eight months, usually within a year because will be affected with damp be affected with damp, uv damage fracture, oxidation and other reasons, LED to the LED unit board scrapped. High quality LED unit board must use double full fiberglass PCB board, although the cost is high, but quality is guaranteed.

IC: to observe whether the brand of IC device used with consistency. With what type of IC, and with how many IC enough to affect the quality of the board. Some businessmen, in order to save the cost, at the time of production unit board would deliberately reduce the number of IC, or with some other brand of IC. The stability of the IC is different, how could you ensure that the board performance?

Lamp beads and chip: look at the naked eye, light is unable to discern the stand or fall of lamp bead. Can only rely on the long time test, aging test is an expert said. Electricity generally small workshops, before they leave the factory, check the LED display is able to function properly, is not a long time aging test. Because they can't afford the time cost and manpower cost.

Check the appearance of the selected material quality

(1) PCB board and processing quality. (2) IC device brand and consistency; (3) lattice quality; Check the circuit design of circuit design specification, PCB wiring conform to the requirements of the LED display technology.

Check the welding quality

Check whether there is patch components, wrong posts leakage, is there a component pin burr short-circuit phenomenon. Check whether direct plug-in solder joints smooth round, board face is clean and tidy, no welding welding leakage. Check light lattice degree of instrumentation and the ink color consistency.

The consistency of electric testing luminous dot matrix;

(2) the current test whether line drive pipe CEM4953 effective protection;

(3) electric testing signal transmission capacity.