Ledcoms is professional LED display manufacturer and solution provider based in Shenzhen, China, focusing on R&D, manufacturing, sales and pre-to-after sales service of LED displays. http://nb3Electrical.com.au/?wptouch_switch=desktop&redirect=https%3A%2F%2Fledcoms.com%2Far%2Fsix-daily-maintenance-of-led-display%2F