LG SJ2 - Section 4 Wireless Subwoofer Part

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SECTION 4

WIRELESS SUBWOOFER PART

CONTENTS

ELECTRICAL TROUBLESHOOTING GUIDE ................................................................................................... 4-2

1. SMPS POWER CIRCUIT ........................................................................................................................ 4-2

2. LED PART ............................................................................................................................................... 4-4

3. POWER AMP PART ............................................................................................................................... 4-5

WAVEFORMS OF MAJOR CHECK POINT ...................................................................................................... 4-6

1. AMP IC .................................................................................................................................................... 4-6

WIRING DIAGRAM ............................................................................................................................................ 4-7

BLOCK DIAGRAM ............................................................................................................................................ 4-9

CIRCUIT VOLTAGE CHART ........................................................................................................................... 4-11

PRINTED CIRCUIT BOARD DIAGRAM ......................................................................................................... 4-13

1. SMPS & AMP P. C. BOARD DIAGRAM ............................................................................................... 4-13

4-1