Tianjin Hualong Communication Technology Co., Ltd. inquired according to the shutter display. Main business: crash, black screen, no boot, water treatment, no charging, no sound, no card reading, no card swiping, inflexible screen and button failure. The store has been engaged in digital product maintenance and entity management for nearly 16 years, which has been well received by customers. At the same time, the technical engineer has 16 years working experience and is skilled in technology.