And the price of phone is reasonable and as low as possible

phone contains the charger, car charger and jammer.
Weld parts due to the role of the force at time of press sealing off, causing the phone to shut down. Maintenance, in a targeted manner to strengthen key lower part of the integrated circuit or component welding generally solve the problem. The caller calls shutdown shutdown is the mobile phone can boot, network, can call the phone ringing sound when a call, the phone shut down. This failure appears to be complex, is actually very simple, calls will be shut down? Is nothing more than ringing sound caused. Ring a ring, why would shut down? This is because a lot of ring work when battery voltage BATT + direct power supply, when the ringing of leakage, it will result in phone calls shutdown. phone has the dynamic jamming range.The company should monitor and supervise the production process of phone.Therefore, mobile phone repair personnel on hand should have a containing current, voltage meter multi-function round-trip run power, for maintenance use. Maintenance ammeter connected in series in the mobile phone power circuit, by measuring the total current of the mobile power supply circuit to determine the fault location. 1, press the power button, the ammeter pointer does not move or logo placed, the phone can not boot. This phenomenon is the cause boot signal circuit or power IC does not work. 2, press the power button, there are dozens of ma current, then back to zero, the phone can not boot. There are dozens of ma currents, indicating that the basic failure of the power part of the multi-clock circuits, logic circuits or software is not normal cause. The feedback of the customer is very important for phone .And the price of phone is reasonable and as low as possible
If the current minor move, the clock circuit should be normal, general software failure, if not swing, failure or CPU clock circuit did not work properly. In addition, dozens of ma current stops moving, press the switch button no response, in most cases for a software failure. Does not boot, the boot key ammeter pointer indicates current 200ma or so pause immediately back to zero, which is a typical piece of code data confusion caused by the software does not boot. Phone power leakage (do not press the power button) there are 20 to about 30ma. The power part of the component short-circuit or damage. Press the power button, a large current, indicating that the power supply part of the short-circuit phenomenon, or the power amplifier part of component damage. The manufacturer has cut the price of phone .  Able to boot the standby current than normal. Showed that the load circuit component leakage. Remedy: power to the mobile phone, after 1-2 minutes with the back of which a component to feel hot, be replaced, in most cases, troubleshooting. 7, the phone is switched on to play 112, observed changes in the current, if the current change is normal, then the emission current is normal, in the absence of current changes, then the transmitter circuit does not work, if the current change is too large, a general description of the amplifier circuit is broken.