Basic skills in mobile phone repair

April 21, 2011 - PRLog -- Auto power

With the battery, do not press the on / off key to open the boot at the state of the. Mainly due to on / off power line to ground short circuit or other components to ground short circuit. Remove the phone board, after cleaning with alcohol foam, most of them can solve this problem.

Auto power off (auto power off)

1. Vibration Automatic shutdown: This is mainly due to the battery and battery causing poor contact between the contact piece.
2. Key off: phone as long as the keyboard, the phone will not shut down a certain key by phone to automatically shut down, mainly due to CPU and memory Weld result, strengthen the memory, CPU and memory generally solve the problem of welding.
3. Fired off: one click launch button on the phone automatically shut down, mainly due to failures caused by power amplifier section, generally due to power supply IC (or amplifier control) caused by this failure.

Weak launch, launch off the signal

1. Emission weak: in the standby state, no significant weak, a phone call, or immediately after a few phone calls show weak, low-power warning appeared the phenomenon. First, this phenomenon is due to the interface between the battery and the contacts are dirty or bad result; followed by the battery contacts on the phone circuit board caused by poor contact between the interfaces; and then second is the damage caused by power amplifier itself.

2. Launch out signal: in the standby state, the signal properly, immediately fired off a cell phone signal, this phenomenon is due to cell phone amplifiers or damage caused by cold solder joint failure.

Leakage: Leakage is more difficult to repair phone fault.

First, determine the power supply, the power switch is burnt out causing a short circuit. Second, to determine whether the damage to the amplifier. Thirdly, leakage current is not too many cases, to the mobile phone with power 1 to 2 minutes after the back of the hand to feel which part of the heating elements serious, this component will be bad no doubt, be replaced.

Not network:

No network signal is not divided into a network, no signal no network two cases. Ericsson series is currently on the market, the Samsung series mobile phones, as long as the receive channel is good, there will be signal strength values ​​show has nothing to do with whether the transmitted signal, the other series of mobile phones into the network must wait until after the display signal strength values . Other series of fault in determining the scope of mobile phone, plug in your mobile phone SIM card, transfer the menu, use the manual search method to find the network, this time, the network can be found to prove that receive channel is good, is not due to transmission channel network failure ; with the menu can not find the network that receive channel methods have failed, the first service to receive channel.

Signal instability (off signal)

Since the receiver channel components are caused by cold solder joint (Shuaiguo prone to this failure the phone). Mainly on the receiving filter, SAW filter, IF filter and the receiver IC and other components for welding, most of them can return to normal.

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