Beijing is one of the first national historical and cultural cities, and also the city with the most world cultural heritage in the world. The history of more than 3,000 years has given birth to the Forbidden City, the Temple of Heaven, the Badaling Great Wall, the Summer Palace and many other places of interest. As early as 700,000 years ago, the primitive tribe "Beijingers" appeared in Zhoukoudian, Beijing. In BC 1045, Beijing became the capital of thistle, swallow and other vassal states. Since 938, Beijing has successively become the capital of Liao, Jin, Yuan and Ming and Qing Dynasties.

Xiang Ligang, a well-known observer in the communication industry, thinks that the number of users is 654.38+0 billion, which means that it is almost three times that of North America and more than the whole of Europe. On the one hand, it shows that the development of communication industry in China keeps pace with the times. On the other hand, it also means that the China market is full of opportunities. Compared with 20 10, the number of mobile phone users per 100 people has increased by 9.2, and the number of mobile phone users is still rising rapidly, providing a market full of business opportunities.

Founded in 2008, Crazy Mobile Phone Maintenance Training School adopts the teaching philosophy of flexible learning and keeping up with the market, emphasizing the integration of theory with practice, and paying attention to skills training and comprehensive skills training. In order to strengthen students' practical ability, the school has corresponding practical operation problems in each practical class. In the process of learning, students answer questions while operating, and integrate the knowledge, technical requirements and norms related to operation, so that students can truly digest, understand and master this technology. The school teaches all the year round, regularly every month, including the church, and recommends employment for free for life.

The working principle analysis of each circuit of iphone4S, iphone5, iphone5S, iphone6 and ipad, and the detection and troubleshooting of related circuits of the motherboard; No power on, no service, difficult transmission, white screen, black screen, touch screen failure, SIM card not reading, no wifi, no Bluetooth, no charging, no MP3, invalid earphone insertion, mute earphone, mute reception/noise/whisper, no voice transmission, no recording, no third place, no vibration, side key/back key failure, no connection, unlimited recovery mode. Software problems such as system upgrade, flat brush, downgrade, jailbreak and unlocking; Iphone trigger component. Pry IC stunt without removing the edge glue, pry hard disk 100%CPU without removing the tin drum stunt, disassemble the original CPU, clear the glue, and divide the upper and lower covers. A6CPU factory's tin stunt iphone factory decodes the ID by hand (without polishing), writes the hard disk number and chip backup, teaches students to move the board by hand, and guides students to independently complete the process of moving all the boards of iphone4, 4S, 5 and ipad4 and pass the test.