1. Confirm the battery is bad, check whether the appearance of the battery is deformed or damaged,
and whether the battery holder and the battery are in poor contact.
2. Check if the DC head or Micro USB port of the charging connector is deformed or broken, and if
there is any solder joint
3. Use a multimeter to measure whether the battery voltage is above 4.2V. If it does not reach 4.2V, put
the battery into the normal machine, charge it with OK power for 1 to 2 hours, and then measure whether
the battery voltage has increased.
(1) If the battery cannot be charged properly, the battery may be a problem.
(2) If the battery is charging normally, the motherboard may be faulty.
4. Put the OK battery into the problem machine, use the OK power supply to charge the machine, and
observe the 5V power input current.
(1) If the charging current device does not display charging, re-burn the firmware and confirm
(2) If there is no charging current, check whether the DC head or Micro USB port is deformed or
broken, whether there is solder joint welding, and whether the battery holder and the battery holder are in
good contact. Check if the DC IN pin of the module is broken or soldered or shorted, and the pin bypass
capacitor is shorted.
5. The above checks are invalid.
(1) If the DC head is not charged, check if there are any solder joints or short circuits at the legs of
modules 141 and 142. Check if D14 is short-circuited or damaged.
(2) If the Micro USB port is not charged, check if U26, B5, and D1 are abnormal, and replace U26
without any abnormality.