LG NP5550W - Dual Play Connection; Setting Up Dual Play

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3-1

SECTION 3

ELECTRICAL

CONTENTS

ONE POINT REPAIR GUIDE ............................................................................................................................ 3-2

1. NO POWER PROBLEM ......................................................................................................................... 3-2

2. NO SOUND IN PORTABLE MODE ........................................................................................................ 3-3

3. NO SOUND IN BLUETOOTH MODE ..................................................................................................... 3-4

4. NO CHARGING BATTERY ..................................................................................................................... 3-5

ELECTRICAL TROUBLESHOOTING GUIDE ................................................................................................... 3-6

1. POWER DSP/ AMP ................................................................................................................................ 3-6

2. AMP (PORTABLE MODE) ...................................................................................................................... 3-7

3. KEY/ LED ................................................................................................................................................ 3-8

4. CHARGING BATTERY ........................................................................................................................... 3-9

WAVEFORMS OF MAJOR CHECK POINT .................................................................................................... 3-10

WIRING DIAGRAM .......................................................................................................................................... 3-11

BLOCK DIAGRAMS ........................................................................................................................................ 3-13

1. SYSTEM BLOCK DIAGRAM ................................................................................................................ 3-13

2. POWER BLOCK DIAGRAM ................................................................................................................. 3-15

CIRCUIT DIAGRAMS ...................................................................................................................................... 3-17

1. MAIN - AMP CIRCUIT DIAGRAM......................................................................................................... 3-17

2. MAIN - POWER/ CHARGER CIRCUIT DIAGRAM ............................................................................... 3-19

3. KEY/ LED CIRCUIT DIAGRAM ............................................................................................................ 3-21

4. I/O JACK CIRCUIT DIAGRAM .............................................................................................................. 3-23

5. BATTERY JUCNTION CIRCUIT DIAGRAM ......................................................................................... 3-25

CIRCUIT VOLTAGE CHART ........................................................................................................................... 3-27

PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 3-29

1. MAIN P. C. BOARD .............................................................................................................................. 3-29

2. KEY/ LED P. C. BOARD ....................................................................................................................... 3-31

3. I/O JACK P. C. BOARD ........................................................................................................................ 3-31

4. BATTERY JUCNTION P. C. BOARD ................................................................................................... 3-31