LED display panel is the most basic unit is the LED unit board, the unit board has a problem, will directly affect the entire screen display, like a common color, the area black screen and so on! How to detect the LED display unit board bad? Become a business and manufacturers are concerned about the issue, the following is the joint production of LCF finishing the practical detection of LED unit board method:
1.LED unit plate plate
Some LED unit board manufacturers for low-cost competition, the use of cheap flame-retardant paper board or single-sided fiberboard as LED lights PCB circuit board. Start to use is no difference, the use of about 1 year time easily due to moisture, UV damage, oxidation and so on, resulting in the entire LED unit board scrapped. High-quality LED display unit board is a double-sided full glass fiber PCB board, although the high cost, but the quality is guaranteed.
IC device brand is consistent. What type of IC, and the number of IC, which is also sufficient to affect the quality of LED unit board. Some LED display manufacturers, in order to save costs, in the production unit board will deliberately reduce the number of IC, or mixed with other brands of IC.
3.LED lamp beads and chips:
The naked eye can not distinguish between good and bad lamp beads. Can only rely on a long test to distinguish. General irregular LED display manufacturers, products in the factory will be powered, check the LED display can work properly, but will not go through a long time aging test, because there is time and labor costs. And as the Shenzhen LED display brand manufacturers, the company has a strict production and quality testing process, before the product shipped, lighting test at least 72 hours or more to ensure that each product can be perfectly delivered to the hands of customers.
Second, the welding quality
Check whether the patch is missing parts, wrong paste phenomenon, whether there is the phenomenon of component pin burr short circuit. Check whether the plug-in solder joints are smooth and round, whether the board is clean and tidy, no welding. Check the uniformity of the flatness of the luminous dots and the color of the ink.
Third, power test
Power test (refer to the “Performance Test Report” procedure):
① power test luminescence dot matrix consistency;
② power test on the row drive tube CEM4953 is effective protection;
③ power test signal transmission capacity.
The above is about the detection of LED display unit board is good or bad way. Quality is king, refused to resist cheap shoddy LED display, so as not to affect the LED unit board damage to normal work, and follow-up unnecessary maintenance.