LG SN4A - SECTION 4 WIRELESS SUBWOOFER PART

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4-1

Only for training and service purposes.

SECTION 4

WIRELESS SUBWOOFER PART

CONTENTS

ONE POINT REPAIR GUIDE ............................................................................................................................ 4-2

1. NO POWER PROBLEM (PVDD) ............................................................................................................ 4-2

2. POWER ON ERROR .............................................................................................................................. 4-3

3. POWER ON ERROR .............................................................................................................................. 4-4

4. WIRELESS CONNECTION .................................................................................................................... 4-5

WAVEFORMS OF MAJOR CHECK POINT ...................................................................................................... 4-6

1. VOLTAGE ............................................................................................................................................... 4-6

2. AMP VOLTAGE ...................................................................................................................................... 4-7

3. PWM ....................................................................................................................................................... 4-8

4. LED ......................................................................................................................................................... 4-9

WIRING DIAGRAM .......................................................................................................................................... 4-11

BLOCK DIAGRAM .......................................................................................................................................... 4-13

PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 4-15

1. WOOFER SMPS P. C. BOARD ............................................................................................................ 4-15

2. WOOFER AMP P. C. BOARD .............................................................................................................. 4-17

3. WOOFER KEY P. C. BOARD ............................................................................................................... 4-17