LG NP8350 Service Manual page 30

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 SOUND IN Wi-Fi MODE ................................................................................................................... 3-5
5. NO CHARGING BATTERY ..................................................................................................................... 3-6
ELECTRICAL TROUBLESHOOTING GUIDE ................................................................................................... 3-7
1. POWER SUPPLY ON MAIN BOARD ..................................................................................................... 3-7
2. MICOM .................................................................................................................................................... 3-9
3. LED ......................................................................................................................................................... 3-9
4. AUDIO (BLUETOOTH MODE).............................................................................................................. 3-10
5. AUDIO (Wi-Fi MODE) ........................................................................................................................... 3-10
WAVEFORMS OF MAJOR CHECK POINT .................................................................................................... 3-11
1. MICOM .................................................................................................................................................. 3-11
2. AMP ...................................................................................................................................................... 3-11
3. MPEG .................................................................................................................................................... 3-12
4. BLUETOOTH ........................................................................................................................................ 3-14
5. Wi-Fi ...................................................................................................................................................... 3-14
WIRING DIAGRAM .......................................................................................................................................... 3-15
BLOCK DIAGRAM .......................................................................................................................................... 3-17
CIRCUIT DIAGRAMS ...................................................................................................................................... 3-19
1. MAIN - POWER/CHARGER CIRCUIT DIAGRAM ................................................................................ 3-19
2. MAIN - MICOM/AMP CIRCUIT DIAGRAM ........................................................................................... 3-21
3. MAIN - MPEG CIRCUIT DIAGRAM ...................................................................................................... 3-23
4. I/O CIRCUIT DIAGRAM ........................................................................................................................ 3-25
5. KEY CIRCUIT DIAGRAM ..................................................................................................................... 3-27
CIRCUIT VOLTAGE CHART ........................................................................................................................... 3-29
PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 3-31
1. MAIN P. C. BOARD DIAGRAM ............................................................................................................ 3-31
2. I/O P. C. BOARD DIAGRAM ................................................................................................................ 3-33
3. KEY P. C. BOARD DIAGRAM .............................................................................................................. 3-33
SECTION 3
ELECTRICAL
CONTENTS
3-1