手机开机后关机原因（Mobile phone boot shutdown reason）
If the mobile phone is in the external factors may cau the exclusion of automatic shutdown if the mobile phone is the internal reason (circuit board); the mobile phone also talk about internal caus automatic shutdown problems. (non professional maintenance personnel do not personally engage)
1: check the circuit board and the battery contact pieces by elastic contact pieces not to contact is not good, or is on the circuit board copper dirty or rusty, found the problem with the corresponding measures to solve the problem, (likely to put the battery contact pieces directly welded on the circuit board)
2:, what is the shutdown of the phone?:
A: put the card after the boot, arch to the network after the shutdown, do not put the card, the boot will not shut down, this situation is generally power amplifier may damage
Two: whether or not to put the card card, as long as a start, automatic shutdown, this may be a hardware failure, especially off the machine, you should focus on examination of the logic part of the IC (especially the larger BGA IC and IC under the fierce point (disc) small area), 13 MB don't let go.
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Three: after the boot, over a period of time (more than ten minutes or more), the machine has no reason to turn off (crash), this is generally a software problem, causing this problem generally:
A- becau the software has problems with the power control
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The B-32.768 oscillator has a problem, becau when the machine is in standby (hibernation) state, the operation of the ROM. part is the standard signal given by this crystal oscillator (also with the exception of individual machines)
C- power amplifier performance has been unsatisfactory, the emission current is too large, in the boot for the battery, the moment will not shut down, but the mobile phone in standby after a certain period of time will be a contact with the ba station, the mobile phone will nd a signal to the ba station location registration, becau the power amplifier emission current Ambassador machine will launch (die off).
Four: 13 megabytes to provide some of the telecommunications signal is very weak, this situation as in the past two years, N machine 3310 common problem
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Five: after the boot, as long as the button on the shutdown, this can be sure that the hardware has loo parts, if there is a front and rear panels do not pass, check the inline at
鲜虾粥的做法魅惑控制Why mobile phone automatic shutdown fault is more complex, involving all kinds of circuit, should consider all aspects, not focus on this trick before two strokes, with a focus on process of the basic fixed it must distinguish the difference in automatic shutdown said eight:
Irregular shutdown without timing
Button shutdown
Call off
Turn off the power after starting
Turn off the hand
The lid shut down
The launch of the shutdown
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The lamp is turned off
Automatic shutdown failure is more annoying and difficult to rule out the fault repair, are often unable to start, even some experience in the maintenance of "master" also feel at a loss, in fact, as long as the maintenance notice, to ize the esnce of fault, this fault repair is not difficult. The following are analyzed parately.
芹菜可以炒鸡蛋吗The first type of irregular timing shutdown processing skills
Mobile phone does not stop regularly, refers to the phone boot, access, call is normal, but sometimes suddenly shut down. There are mainly two kinds of faults. One is that the contact between the battery and the battery is bad; the other is that the output voltage of the power supply IC is unstable; the voltage of the output of the is unstable,
The power supply circuit are weld or poor contact caud by
mobile phone protection. Mobile phones caud by dampness and falling on the ground are liable to cau this phenomenon. Inspection should first check whether the contact of the battery contact well, if normal, we should focus on strengthening the circuit welding.
Second button shutdown processing skills
This kind of fault in the mobile phone circuit board thin machine, general machine straight is higher than the turning dia incidence was higher than that of imported domestic machine machine, if the keys too hard and easily make negative components caud by the board. In addition, like the TCL 8388 row at connected by the mobile phone, but also the key off high models.
Third call shutdown processing skills
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mso-bidi-language: AR-SA "> call can boot, shutdown is mobile phone network, also can make the call, but the caller when the mobile phone ringing sound, mobile phone shutdown. This kind of fault ems complicated, but in fact it is very simple. Why does the telephone call turn off? It is only caud by ringing. Why does the phone turn off when ringing? This is becau a lot of ringing work is powered directly by the battery voltage BATT+. When the ring is broken, it will cau the call to be switched off. In addition, the power amplifier leakage and battery power shortage, YMH leakage, resulting in this situation is not much, and if they go wrong, it will even launch off.
安全知识竞赛Fourth boot after shutdown processing skills
(1) the mobile phone power supply circuit has a fault, so that although the mobile phone "barely" to meet the conditions of the boot, but the boot will be switched off after a while. Especially with the booster circuit of mobile phones (such as Motorola, V70, Samsung, A388 and other mobile phones) more prone to this fault. We know that the mobile phone battery voltage is very low, generally about 3.6V, some mobile phone battery voltage is lower, such as battery powered mobile phone NOKIA 3210 2.7V only, but a lot of the mobile phone circuit voltage, require a higher so that some mobile phone t a boost circuit. When the boost circuit fails and the boost circuit has an impact on the switch machine of the mobile phone, it is possible to cau the handt to turn off automatically after the switch is turned on.
(two) mobile phone power supply load circuit failure, resulting in mobile phone power consumption, the power supply circuit voltage is low, so that mobile phone protection shutdown. In particular, the launch circuit of mobile phones is most likely to cau excessive load on mobile phones, causing the phone to turn off after the boot. For the transmission circuit caud by the shutdown after the failure, the general overhaul method is: SIM card to open, boot, and if there is no automatic shutdown phenomenon, indicating that the automatic shutdown fault occurred in the transmission circuit. Beca
u in the ca of placing SIM cards, the cell phone arches the network and automatically nds ur signals to establish communications with the network. With the SIM card removed, the phone arches
