It is according to the corresponding standard and specification

It is according to the corresponding standard and specification of phone
The first is "off topic". Often hear a lot of friends in the maintenance sector, said: "Well, now repair industry, too many people, the competition is too intense, it is difficult to make money, and even some of my friends also intend to do other industries. But, my dear friend! Please take a look at the computer industry, garment industry, catering and tourism. . . , Even picking up litter, was there any industry, competition is not intense? Which industry is Qian Haozhuan? ? ? In fact, not losing industry, only to lose money in the enterprise. And, no matter which industry, there is a "Pareto rule", which is 20% to 80% of the market, while the remaining 80% of people who can only busted their ass to seize 20 percent of the poor market.
Receive part of the work, after a few seconds the phone will enter the normal standby mode, the current 5-20mA or so regular changes (about one second swing time), the description of mobile phone to receive part of the basic normal; if the phone is switched current in about 10 seconds back to irregular changes in about 50-100mA, 10-20mA, then a few seconds and then jump to about 50-100mA, and so forth, then the receiving part is not working properly. If the current is motionless in the boot (no search action), network failure logic circuits out of the question (usually multi-Weld or software problems). This kind of phone has the high thermostability.In this way, to find a break point through the left row of thread and right rows of thread corresponding pin. Approach: the left row of thread 11 # and 22 # of the right row of thread to use the cable. In this way, the first edge of the break to resolve. Similarly, if the second or third edge break, and processing as above. The double-headed cable is not obvious method of repair of the break: break the law that the break at the general, including the first edge of the corner. Check first edge through the left row of thread which kick: we must first find the first turn at the edge (on the edge of the graph, for example), then carefully scratch the insulation with a blade at point A .Experienced maintenance personnel, through the different current values, you can roughly determine the site of the fault. Power dozens of ma current, indicating that the leakage of a circuit component of the positive power supply; power current is greater than the 500ma, indicating that the CPU or power supply IC, amplifier, power supply filter capacitors and other components breakdown. Is still "a system"? The above "soft" power supply in the normal good on you have to press the power button about 800mS that, according to the above measured data, it is clearly found VREFRF02: 0V, a 1.4V reference voltage is supplied to the IF IC. The voltage can not take a look at the power supply path. Shown in Figure 6. The C230 is the power IC VREFRF02 voltage output filter capacitor.