The factory of phone has the suitable and professional inspection personnel

Able to withstand the mechanical stress (such as: press the button when the stress) is very small, very prone to cold solder joint failure, and often Weld point is difficult to be found with the naked eye. The Act is based on the failure of the phenomenon through the analysis of the works to determine fault may be in which units in the unit with large area welding and cleaning. Suspicious welding point, welding again. Welding tools available pointed anti-static soldering iron or heat gun. Reload the software. This method is not using all other appliance repair, but is often used in mobile phone repair. The reason is: the control software of the phone is quite complex, easily result in data errors, part of a program or data to be lost. For the normal minor and mid-sized meeting room, it is easier to select the position of phone and the needed position is less.Charge management, motor enable, alarm clock, enable, enable the LED, current limiting protection, overvoltage protection, overtemperature protection function, and also provides the interface between the CPU and the SIM card. phone will make that the cell phone cannot receive the signal from the base station. IF IC replacement, installation, card, signal out, there is no "diving" to call everything is normal, try one week nothing removed after the user has not returned. Summary: The same phone, the three "machine" go wrong really in trouble. Can not boot, find out if one is not out to the CPU power supply voltage VIO, power IC A1 feet breakpoint due to supply a good job, software corruption, rewrite the solution can not boot, microcontroller which 2S clearance. The maximum output power of phone is 6dBm.The factory of phone has the suitable and professional inspection personnel
Not synchronized, the receiver is a "processing line", a process problem will not get finished. N8310 problems "process" no local oscillator signal for demodulation. LO no wave, no power supply to it, to lazy to avoid the risk, to avoid demolition of the power IC, by electricity, are still not synchronized. Check letter machine synchronization is still starting from the power supply, the results identified the RF reference voltage on the 2nd, not sent to the IF IC, into the water corrosion, fly line to solve. Why know the two points of the fly line? Have long measured the light board, draw the "aviation map" Third, do not call "signal diving" is a do not call this broad category.A few cases, damage the CPU plug the USB cable, a small number of amplifier damage, part of the high-frequency wave damage caused by the difference signal, easy to significant emergency call following elaborate a common fault and problem-solving. Does not boot or crashes, the software and CPU Weld cause, reinstall the CPU, pay attention to temperature tune the end point, if the CPU Weld. Must reinstall, simple add welding, does not take long to repair, if the software problem, first format.