手机不入网(没信号)故障的维修思路与处理方法2011（The phone is not in the network (no signal) failure maintenance thinking and processing method 2011）.docVIP

手机不入网(没信号)故障的维修思路与处理方法2011（The phone is not in the network (no signal) failure maintenance thinking and processing method 2011） Mobile phone is not the net (no signal) fault maintenance idea and processing method of the mobile phone is not the net (no signal) is a common multiple fault (accounts for more than 40% of cell phone fault), for mobile phone not access (no signal) failures, we must first distinguish receiving part part of reasons that to clear up after suit the remedy to the case. In general, we can select the search network in the sub-menu of the network Settings in the mobile phone and the menu, and then select the search network and then confirm it. (1) : if you can search to the network (on screen display China mobile and China unicom) was initially workers often receive part of it is work, not the net (no signal) failure is part of problem (only shows one of the China mobile or China unicom, its just phone to receive part of the channel is not smooth or 13 million/VCO have deviation, if emission part of the normal would not have access). 2. If you cant find the network, you can say that the cell phone receiving circuit has a problem. Initial positioning of fault in maintenance Cracked open the phone before, we can pick up regulated power supply boot (dont put the card), then observe the changes of cell phone sounet current and standby current, usually on the change of the current mobile phone within five seconds after the amplitude is large, generally around 100 ma irregular beating (at this point is to receive part of the mobile phone in the state of receiving, constantly changes the frequency of the VCO, the frequency of the cell phone reception to the base station of the public channel frequency). (1) : if the receiving part of the work is normal, a few seconds successful opportunity to enter the normal standby mode, about 5 to 20 ma current in regular change (about once a second swing), at this point that basic normal phone receiving part; (2) : i