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Internal Use Only Website http://biz.lgservice.com SERVICE MANUAL 4.1 ch Hi-Fi Sound Bar MODEL: NB4540 (NB4540, S44A1-D) SERVICE MANUAL MODEL: NB4540 (NB4540, S44A1-D) CAUTION BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS" IN THIS MANUAL. P/NO : AFN75854865 FEBRUARY, 2014 CONTENTS SECTION 1 ... GENERAL SECTION 2 ... CABINET & MAIN CHASSIS SECTION 3 ... ELECTRICAL SECTION 4 ... REPLACEMENT PARTS LIST 1-1 SECTION 1 GENERAL CONTENTS ESD PRECAUTIONS ... 1-3 HIDDEN KEY MODE... 1-4 SOFTWARE UPDATE METHOD ... 1-5 SERVICE INFORMATION FOR EEPROM ... 1-6 SPECIFICATIONS ... 1-7 1-2 ESD PRECAUTIONS Electrostatically Sensitive Devices (ESD) Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated circuits and some field-effect transistors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity. 1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commerc