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This lesson is about the maintenance for the prompt of the battery anomaly

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First look at the fault phenomenon that indicates abnormal charging

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Plug in the charging cable to charge the phone, it will prompt abnormal charging,

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please consult the customer service center

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this is a malfunction

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Another phenomenon is that when the charging cable is plugged in,

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it prompts that the battery contact is abnormal, please consult the customer service center

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It is common to have these two symptoms

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The solution is to find the information detection pin of the battery

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The detection circuit of the battery is from the battery to the battery holder

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The battery holder transmits the battery information to the charging chip or the main power supply

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The charging chip feeds back the information detected by the main power supply to the CPU

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There is a chip on the battery board

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The ID pin is used to transmit signals through the chip on the battery board

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The battery holder is just a connector

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The connection seat is to contact the ID pin information on the battery seat through the shrapnel

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Android mobile phones generally detect battery information by charging chips or main power chips

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Next, let's look at Huawei's battery detection circuit

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First look at what components are in this circuit

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The first is the battery holder, the battery holder is to install the battery,

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we regard it as a battery

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The battery holder leads to the main power supply through a 1000 ohm resistor

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The main power supply is responsible for detecting the information of the battery,

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and its code name is BATT_ID

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In this circuit, this side is powered by 1.8 volts

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The 1.8 volt power supply provides a voltage of about 1.8 volts to this signal line through a 68 kohm resistor

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After the BATT_ID pin gets a voltage of 1.8 volts,

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it reaches the main power supply through a 1K ohm resistor

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At this time, the large power supply detects the information of the battery through this signal line

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During maintenance, we should pay attention to whether the resistors R1506 and R1502 are abnormal

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If the resistor R1506 is damaged or falsely welded,

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the BATT_ID pin will not have a voltage of 1.8 volts, and the entire circuit will fail

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The detection pins are usually on the 4 smaller pins in the middle of the battery holder

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This is Huawei's battery detection circuit principle

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That's all for this lesson