LG inverter maintenance
Model: SV075IG
Failure: power display "LV" alarm
Fault analysis: after inspection of the converter rectifier charging resistance are good, but after power did not hear the contactor, because the charging circuit of the converter‘s not using thyristor contactor but by pull to complete the charging process, so that the fault can be at the contactor or control circuit and power supply. Remove the contactor added 24V DC contactor normal work. Then check the 24V DC power supply, after careful inspection of the voltage is the output of the LM7824 regulator after the regulator, the measurement of the regulator tube has been damaged, to find a replacement after the power on the normal work
Failure repair: replacement of the contactor power supply voltage regulator IC normal operation.
Jia Hong Wei repair service hotline: 0755-28916839, 13640994287 Shaw