LG SH7B - Section 4 Wireless Subwoofer Part

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4-1

SECTION 4

WIRELESS SUBWOOFER PART

CONTENTS

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