Inspection revealed that the power adapter and charger is generic to fault 1, such failures are charging control circuit IC4 and charging output circuits IC2 and peripheral component problems.

Can be seen by circuit IC4, IC2 and peripheral components charging circuit and a charging circuit, IC4 (HMS87C1102A) Korea product, look for information, precharge it has high accuracy, constant current and constant voltage charging, battery status, charging status display lights and temperature detection functions. Which battery temperature detection is through battery within of thermistor as temperature sensor, output signal by Charger Socket CON2 of II feet insert, by resistance R27 sent to IC4 of ③ feet within temperature sense measuring compared device, and internal of threshold voltage compared Hou and IC2 and the peripheral components tie, decided whether output charging current, this temperature detection circuit is not by work power fluctuations effect of, first tested charging socket CON2 of ①, and ③ feet found no charging voltage, Check the charging circuit and charging circuit IC4 feet voltage and circuit components are not found problem, taking into account the normal display function, it is estimated that this part of the circuit without fault, focus on charging circuit made up of IC2 and peripheral components. Measurement voltage 29V IC2 ⑧ feet properly, check R3 and R9, R5, C12, Ql, R8, Q2, and finally found the Qlc, e open, C352 transistor was replaced, charging back to normal, and troubleshooting.