LG NP7550 Music flow P7, Service Manual

 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

 ...................................................................................................

3-7

1. POWER/ DSP/ AMP ............................................................................................................................... 3-7
2. CHARGING BATTERY ........................................................................................................................... 3-8
3. AMP ........................................................................................................................................................ 3-9
4. PAIRING BLUETOOTH ........................................................................................................................ 3-10
5. KEY/ LED .............................................................................................................................................. 3-10

WAVEFORMS OF MAJOR CHECK POINT

 ....................................................................................................

3-11

1. DSP ....................................................................................................................................................... 3-11
2. ADC ....................................................................................................................................................... 3-11
3. BLUETOOTH ........................................................................................................................................ 3-12
4. AMP ...................................................................................................................................................... 3-12

WIRING DIAGRAM

 ..........................................................................................................................................

3-13

BLOCK DIAGRAMS

 ........................................................................................................................................

3-15

1. SYSTEM BLOCK DIAGRAM ................................................................................................................ 3-15
2. POWER BLOCK DIAGRAM ................................................................................................................. 3-17

CIRCUIT DIAGRAMS

 ......................................................................................................................................

3-19

1. MAIN - DSP/ ADC/ AMP CIRCUIT DIAGRAM ..................................................................................... 3-19
2. MAIN - POWER/ CHARGER CIRCUIT DIAGRAM ............................................................................... 3-21
3. JACK CIRCUIT DIAGRAM ................................................................................................................... 3-23

CIRCUIT VOLTAGE CHART

 ...........................................................................................................................

3-25

PRINTED CIRCUIT BOARD DIAGRAMS

 .......................................................................................................

3-27

1. MAIN P. C. BOARD .............................................................................................................................. 3-27
2. JACK P. C. BOARD .............................................................................................................................. 3-29