LG SJ4Y - Section 4 Wireless Subwoofer Part

4-1
Copyright © 2017 - 2019 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
SECTION 4
WIRELESS SUBWOOFER PART
CONTENTS
WIRING DIAGRAM ............................................................................................................................................ 4-2
BLOCK DIAGRAM ............................................................................................................................................ 4-3
ONE POINT REPAIR GUIDE ............................................................................................................................ 4-4
1. POWER ON ERROR .............................................................................................................................. 4-4
2. WIRELESS CONNECTION .................................................................................................................... 4-6
WAVEFORMS OF MAJOR CHECK POINT ...................................................................................................... 4-7
1. CRYSTAL ................................................................................................................................................ 4-7
2. FLASH MEMORY ................................................................................................................................... 4-7
3. VOLTAGE ............................................................................................................................................... 4-8
4. AMP VOLTAGE ...................................................................................................................................... 4-9
5. PWM ..................................................................................................................................................... 4-10
6. LED ....................................................................................................................................................... 4-11
CIRCUIT VOLTAGE CHART ........................................................................................................................... 4-13
PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 4-15
1. WOOFER SMPS & AMP P. C. BOARD ............................................................................................... 4-15