LG SH5B Service Manual page 56

WIRELESS SUBWOOFER PART
ONE POINT REPAIR GUIDE ............................................................................................................................ 4-2
1. POWER ON ERROR .............................................................................................................................. 4-2
2. WIRELESS CONNECTION .................................................................................................................... 4-4
WAVEFORMS OF MAJOR CHECK POINT ...................................................................................................... 4-5
1. CRYSTAL ................................................................................................................................................ 4-5
2. FLASH MEMORY ................................................................................................................................... 4-5
3. VOLTAGE ............................................................................................................................................... 4-6
4. AMP VOLTAGE ...................................................................................................................................... 4-7
5. PWM ....................................................................................................................................................... 4-8
6. LED ......................................................................................................................................................... 4-9
WIRING DIAGRAM .......................................................................................................................................... 4-11
BLOCK DIAGRAM .......................................................................................................................................... 4-13
CIRCUIT DIAGRAMS ...................................................................................................................................... 4-15
1. WOOFER SMPS & AMP - SMPS CIRCUIT DIAGRAM ....................................................................... 4-15
2. WOOFER SMPS & AMP - AMP CIRCUIT DIAGRAM .......................................................................... 4-17
CIRCUIT VOLTAGE CHART ........................................................................................................................... 4-19
PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 4-21
1. WOOFER SMPS & AMP P. C. BOARD ............................................................................................... 4-21
SECTION 4
CONTENTS
4-1