LG LMU360CE Service Manual - Page 67
Electronic Parts Troubleshooting Guide
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Electronic Parts Troubleshooting Guide ❇ Refer to electronic contorol device drawing & schematic diagram. Trouble 1 The Product doesn't operate at all. Troubleshooting Guide Turn off the main power and wait until LED on outdoor PCB is off. Turn on the main power again. Does "Beeping" sound is made from the indoor unit? NO Check the voltage of power(AC208V/AC230V, 60Hz). • The voltage of main power. • The voltage applied to the unit. • The connecting method of Indoor/Outdoor connecting cable (each color) • The P.W.B. Ass'y (Fuse, Noise Filter, Power Transformer, IC01D, IC02D, etc.) YES • Primarily, the operating condi- tion of Micom is O.K. • Check CN-DISP1 The operation check of the P.C.B. Ass'y Procedure 1) The input voltage of power trans- former. 2) The output voltage of power transformer. 3) IC01D(7812) 4) IC02D(7805) 5) IC01A(KIA7036) Specification 1) AC230V ± 30V : Check the rated voltage 2) 15V ± 1.5V 3) DC12V 4) DC5V 5) The voltage of micom pin 29 : DC4.5V↑ Remedy 1) Replace power transfomer. 2) Replace power transfomer. 3) Replace IC01D. 4) Replace IC02D. 5) Replace IC01A. Service Manual 67