LG SJ2 Service Manual page 46

WIRELESS SUBWOOFER PART
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
SECTION 4
CONTENTS
4-1