signals good times and bad

Failure Analysis:
Following the removal of the battery failure and the external environment interference cases, the cause of the malfunction may exist within the mobile phone cold solder joint point (especially for the subject collision, compression, drop a cell phone especially), it may be the software problem.
Examination and treatment:
According to failure phenomenon can be related to the circuit parts of a comprehensive repair welding and cleaning (with emphasis on site inspection is the antenna, the transmit path, receive channel, frequency synthesizer), and then carefully install the phone, if the phone can be normal and stable work half months (referring to a different time and place under the conditions, failure time it does not appear), then the interruption has been removed, otherwise the point of failure still exist.
This failure in the repair of household appliances is called "soft fault", which exclusion is sometimes very "difficult", which those in need of repair experience, detailed and comprehensive analysis.

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