LG HBLG2350E Service Manual - Page 20
ELECTRIC PARTS TROUBLESHOOTING GUIDE, Possible Trouble 1
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ELECTRIC PARTS TROUBLESHOOTING GUIDE: Possible Trouble 1 • The unit does not operate. Is the Trans output power the NO same as specified? YES Is the Trans output power NO about AC 14V? YES Is output Voltage of IC01D NO DC 12V? YES Is output Voltage of IC02D NO DC 5V? YES Is the reset circuit all right? NO (The No.14 of Micom is 5V.) YES Is the connection between NO Main and Display all right? YES NO Is the voltage No.18 of Micom DC 5V? YES Exchange Main P.W.B Ass'y. • Check the Fuse. • Check the wiring diagram. Is shorted the Trans. output? NO • Check the Main P.W.B pattern. YES • Exchange the Trans. • Exchange D02D~D05D. • Exchange IC01D. • Exchange IC02D. • Exchange IC01A. • Connect connector exactly. • Check the P.W.B pattern. Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes - 20 - LGE Internal Use Only