Repair and maintenance experience for charging failure and inaccurate electri...

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Repair and maintenance experience for charging failure and inaccurate electric quantity:

1. Charging failure: change U2, fault correction done

2. The fault of inaccurate electric quantity showed up one day later

3. Repair welding U2, fault correction done

4. The electric quantity was inaccurate one hour later

5. Charging failed when the electric quantity is inaccurate

6. The mainboard worked normally without being screwed up, but would be abnormal after being assembled in the machine

7. Changed the charging chip connecting line U1701, in vain

8. Measured the battery interface resistance to ground, the result was normal

9. Changed the battery interface connecting base, in vain

10. Changed battery, in vain

11. Dismantled the charging chip, measured the welding spot resistance to ground, it found the E3 foot resistance to ground is abnormal (1.8)

12. Connected it to the 1.8 of U2 from the welding spot of chip through fly wire, the fault was corrected.