1 . Protection circuit effects of lithium over sensitive, so a large current on the power .

 

 

2 . Battery itself is aging.

3 . Sheet metal battery contacts bit dirt , causing the power is bad.

4 . Splice between the battery and the phone is easy to loose.

 

If, after examination , found the first two questions , then it must be sent to specialized repair shop to repair . If the two issues , the only battery metal oxidation caused by dirty , just wipe clean with a glue stick to the situation will be improved. Between the battery and the phone pad of cardboard or film , you can also solve the problem of poor contact caused by loose battery .

 

 

    If the automatic shutdown of the factors that may cause the phone to exclude the outside , it is that the phone's internal ( circuit board ) for a reason ; below also talk about the phone's internal causes automatic shutdown problems ( recommended non-professional maintenance staff do not personally engage . a )

 

 

1: Check the circuit board and battery contacts are resilient enough because the contacts to make contact with bad or dirty or rusty copper circuit board , to identify the problem with the appropriate way to solve the problem , ( possible put the battery contacts soldered directly to the circuit board )

2 : see under what circumstances the phone is turned off :

    One : put the card after boot, found the network after shutdown, hold the card boot will not shut down , such cases are generally amplifier may be damaged.

    Two : whether or not to put the card card , as long as a boot, automatically shut down, this could be a hardware failure and more , especially Shuaiguo machine, you should focus on checking the logic part of the IC ( especially bigger BGA IC and beneath the IC defended point ( plate ) small area ) , 13 trillion and do not let go.

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