Don't cracked open the phone only from the point of the appearance of mobile phone its failure, can be divided into three types: 1, the first is completely unable to work, including can't boot, press the power switch mobile phone after the power is connected without any response.The second to can't boot, press the phone after the power switch can detect the current, but no boot normal message: lighting, display lighting on such as buttons, display, according to the character information ringer after startup self-check by prompt, etc.The third kind is able to turn on normally, but there are some functions malfunction, such as the key, the display abnormal (character prompt error, black screen, unclear character), silent, unable to send words.2. Apart from the mobile phone, it can be divided into three types: power supply charging and power supply fault, software failure and receiving and receiving access fault.There are links between the three types of fault, such as: mobile phone software failures affect power supply parts, sending and receiving channel phase-locked loop circuit, sending power level control, sending and receiving channel time synchronization work, etc., and to send and receive access reference crystal oscillator for mobile phone software work with the clock signal.3. According to the nature of the fault, the following five types can be divided into the following five types: non-power failure, network failure, card failure, failure to display fault and other faults.
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