Symptom 1: the earpiece is out of order and you can't hear the other person's speech
Cause: the earpiece is damaged, damped and burned. The FFC cable of some flip flops is connected to the earpiece, so if the FFC cable is damaged, the earpiece is also damaged.
The possible cause of these problems is that the machine has entered into the water, although it is not very large, but it may also cause problems over time. Moreover, the FFC cable of flip phone is particularly easy to break. If the flip times are amazing, the FFC cable can only be replaced if it is damaged.
Condition 2: keyboard failure, unable to control the phone
Cause: if some keys are not good due to too much dust and poor contact, just clean up the dust, but if the key protection board on the main board is damaged, a repair welding is needed. The cause is also due to dampness, so in summer, if sweating is more severe, don't put your mobile phone on your pants, because it is easy to be eroded by sweat or water vapor.
Condition 3: unable to power on or power off
Cause: there may be software problems, but most of them are hardware problems. Just now, my friend's 7610 can't be started because of faulty CPU soldering. As long as the soldering is done, the problem can be solved. Then there may be damage to the character library, damage to the logic power supply, damage to the power switch part, or failure to start the machine, or bad clock signal, or failure to start the machine. Generally speaking, the reasons why mobile phones can't be turned on include the above.