This is mainly part of the users often carry part of the 750 watt electric bike components caused by the loosening of the fault.
The main performance is that when 1: c18 is loose and virtual welding, it will cause abnormal working state of v1 / v 2, great heat, serious deformation of charger shell and charring of circuit board, which will result in v1 / v 2 damage. Can be re-welded c18, check v1 / V2 / R4 / R7.
If the fault cannot be removed, it is necessary to check if there is an open circuit in the d15 / d21. In addition, some 750 watt electric bike manufacturers use a double diode for the output rectifier, one of which also causes the above failure. Sometimes the failure can cause one of the v1 / v 2 to be damaged.
High calorific and accompanied by abnormal noise
The failure is caused by the failure of the output stage damping resistance and capacitance r31c17. In addition, the open circuit or virtual welding of the C12 will also cause the above failure.
There is an unusual noise at work, so that the electricity cannot be charged. Check whether there is false welding or damage to the circuit board, the general replacement of C 8 can be resolved.
When working, there is an abnormal sound, the power indicator and the charge indicator are dark and flashing. Failure is caused by ic1 damage, be careful when replacing, do not damage the printed board copper foil, replace normal, the need to adjust the R28 charger output voltage in the normal working range.