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Redmi Note 8pro mobile phone battery is not durable
Machine model: Redmi Note 8Pro
Customer description: the cell phone battery is not durable.
Test results: The mobile phone can be turned on, all functions are normal, and the motherboard is powered on with short-circuit current 50ma.
Fault analysis: motherboard short-circuit current is generally caused by chip peripheral GND Capacitor or component Short circuit. We just need to find Short circuit components and dispose of them.
First, power up the motherboard, and check the chips or components with high motherboard temperature. After searching, it is determined that the temperature of the motherboard is abnormal. Open the Xinzhizao Soft software, open the annotation drawing of Redmi note8Pro, and find the position of high temperature chip.
Redmi Note 8pro mobile phone battery is not durable Figure 1.
Confirm that this is an NFC chip, open Boardview software, and measure the peripheral components according to schematic, but no component Short circuit is found.
Redmi Note 8pro mobile phone battery is not durable Figure 2.
Redmi Note 8pro mobile phone battery is not durable Figure 3.
After the NFC chip was removed, the motherboard was no longer short-circuit current, so the chip was replaced and the fault was repaired.
Redmi Note 8pro mobile phone battery is not durable Figure 4.
