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Cell phones are high-tech, sophisticated electronics.Working principles, manufacturing processes, software and hardware, testing, and technical standards are the most complex of all electrical appliances.Due to the convenience of small volume, frequent movement and pressure, and the use of frequent and environmental conditions and the aging of components, failure is inevitable.A qualified maintenance personnel, besides must have a certain theoretical basis for maintenance skills, methods, and must also have a certain experience, and according to certain procedures for maintenance, maintenance can quick troubleshooting.A, the causes of handset malfunction GSM mobile phone is not like other household electrical appliances of high voltage, large current, under normal circumstances is not easy to damage, but only to find that in the maintenance, repairing mobile phone is not in the minority, so, what is the damaged cause of cell phones?Taken together, it mainly consists of the following aspects.1, mobile phone to the particularity of surface welding technology due to the installation of mobile phone components form all adopt the surface-mount technology, mobile phone circuit board using high-density synthetic board, the two sides have components, both sides all SMT components in the circuit board, circuit board strain and fixed by soldering and element, element and pasted on the integrated chip pin is numerous, is very dense, soldering and very little, so if you accidentally fell touch or cell phone be affected with damp be affected with damp are easy to make components caused by virtual welding or components and circuit board caused by poor contact phone all kinds of faults.2, mobile phones, mobile phone belong to personal consumer goods, it have to move along with the transformation of the user location, which requires the phone to adapt to different environment, although the designers made specifically designed for the adaptability of mobile phone, but I still can't avoid because of the use time is too long or the phone all kinds of fault caused by improper ambient temperature.Its main performance, it is the water be affected with damp be affected with damp, make components from corrosion, insulation level fell, the control circuit is out of control, causing logic system disorder, operation of the software program directly cause severe hand machine don't boot up.The second is the external force, which manifests as the dissoldering, shedding and contact of the components.3, user improper operation caused by user's improper operation phone lock machine and functional disorder phenomenon is very common, such as random phone menu operation, make certain functions in the closed state, mobile phones can't normal use;Mistakenly entering the password, resulting in the lock of the phone and SIM card, blind attempt will result in the lock and lock SIM card.In addition, the improper menu setting can also cause some "unexplained" failures, such as a reactive power, which may be the machine master set up the call transfer function.Unable to make a call, whether to set up to call out limit work.This requires maintenance personnel to be familiar with the various functions of GSM mobile phones and how to operate the phone>
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