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This lesson talks about the earpiece fault repair

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If there is no problem with the ground value and the earpiece, go to the third step

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The third step, and the fastest way, is to replace the large audio or the large audio contained in the power chip

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Of course, you should pay attention to this replacement

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This refers to the large audio

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This means that the earpiece does not support playing music, then we will replace the large audio

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If the earpiece supports playing music, such as Huawei P40, Redmi K50,

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like these dual speakers, you need to replace the small audio

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The chip that drives the earpiece is different

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First of all, we must determine where the big audio of this phone is

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If it is an earpiece driven by a large audio, then we need to find a large audio line, a large audio chip

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MTK's large audio is usually in the power chip, and some of HiSilicon's are independent

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If it is a large audio driver earpiece, it depends on whether the recording is normal

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If the recording is not normal, in fact, when you replaced the big audio in the previous step, the problem may be solved

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If the recording is not normal, there is no sound when shooting videos,

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and the other party cannot hear your voice when making a call, and there is no sound from the receiver

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This is basically a problem with the big audio, or the working condition of the big audio is not normal

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What are the working conditions of Big Audio? with power supply, reset, bus

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The bus includes control bus, receiving and sending bus

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power supply, reset, bus, this is common

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You need to know where it is, where is the power supply

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This measurement method is the same as when repairing the small audio

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and removing the small audio to measure the ground value

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There is a step when repairing small audio, just test these resets, buses,

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and these buses that transmit sound to see if there is any problem leading to other circuits

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The above maintenance steps are for the damage of large audio, small audio and the earpiece itself

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If you can鈥檛 record and the other party can鈥檛 hear your voice when you make a call,

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we're more sure that it's a fault with the loud audio, and you don't need to test the earpiece

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Depending on the fault, take different measures, to find out

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Also pay attention to whether the earpiece supports stereo, that is,

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whether the earpiece and the speaker on the top are in the same line

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The top earpiece of Xiaomi 10 Pro is a separate line, and the top speaker is also a separate line

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We should pay attention that the functions of all sound circuits must be tested

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After the test, see which function is abnormal to comprehensively judge

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whether it is a problem of large audio or small audio

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We summed up this point when we talked about the speaker being silent,

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so everyone should pay attention to this point

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That's all for this lesson