LG L1404R Service Manual - Page 25
Electrical Parts Troubleshooting Guide
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Electrical Parts Troubleshooting Guide Troubleshooting Guide Possible Trouble 1 The unit does not operate. Is the Trans input power AC 115V? NO (208/230V for LWL1230WAL) ••CChheecckktthheeFFuussee.. ••CChheecckkththeewwiriirninggddiaiaggraramm. . YES Is the Trans output power NO about AC 14V? YES Is shorted the Trans. output? NO • Check the Main PCB pattern. YES • Replace the Trans. Is output Voltage of IC01D NO DC 12V? YES • Replace D02D~D05D. • Replace IC01D. Is output Voltage of IC02D NO DC 5V? YES • Replace IC02D. Is the reset circuit OK? NO (The No.14 of Micom is 5V.) YES Is the connection between NO AC and DC OK? YES • Replace IC01A, C02A. • Connect connector exactly. NO Is the voltage No.18 of Micom DC 5V? YES Replace AC PCB Ass'y. • Check the PCB pattern. Service Manual 25