LG SPJ9B-W Service Manual

4-1
SECTION 4
WIRELESS SUBWOOFER PART
CONTENTS
WIRING DIAGRAM ............................................................................................................................................ 4-2
BLOCK DIAGRAM ............................................................................................................................................ 4-3
ONE POINT REPAIR GUIDE ............................................................................................................................ 4-4
1. NO POWER PROBLEM ......................................................................................................................... 4-4
2. POWER ON ERROR (12 V, 5 VA) ......................................................................................................... 4-6
3. POWER ON ERROR (3.3 VA, 3 V) ........................................................................................................ 4-7
4. WIRELESS CONNECTION .................................................................................................................... 4-8
WAVEFORMS OF MAJOR CHECK POINT ...................................................................................................... 4-9
1. CRYSTAL ................................................................................................................................................ 4-9
2. FLASH MEMORY ................................................................................................................................... 4-9
3. VOLTAGE ............................................................................................................................................. 4-10
4. AMP VOLTAGE .................................................................................................................................... 4-12
5. PWM ..................................................................................................................................................... 4-13
6. LED ....................................................................................................................................................... 4-14
CIRCUIT VOLTAGE CHART ........................................................................................................................... 4-15
1. ICs ......................................................................................................................................................... 4-15
2. CAPACITORS ....................................................................................................................................... 4-15
3. CONNECTOR ....................................................................................................................................... 4-15
PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 4-17
1. WOOFER SMPS P. C. BOARD ............................................................................................................ 4-17
2. WOOFER AMP P. C. BOARD .............................................................................................................. 4-19
3. WOOFER KEY P. C. BOARD ............................................................................................................... 4-19

LG SPJ9B-W Specifications

General

Brand	LG
Model	SPJ9B-W
Category	Speaker System
Language	English