LG SoundPlate LAP340, Руководство по обслуживанию

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3-1
SECTION 3
ELECTRICAL
CONTENTS
ONE POINT REPAIR GUIDE
.......................................................................................................................... 3-2
1. NO POWER PROBLEM (20 VA) ............................................................................................................ 3-2
2. NO POWER ON ...................................................................................................................................... 3-3
3. NO AUDIO OUTPUT .............................................................................................................................. 3-4
4. NO AUDIO OUT IN OPTICAL FUNCTION ............................................................................................. 3-5
5. NO AUDIO OUTPUT IN BT FUNCTION ................................................................................................ 3-6
ELECTRICAL TROUBLESHOOTING GUIDE
............................................................................................... 3-7
1. POWER SUPPLY ON SMPS BOARD .................................................................................................... 3-7
2. POWER SUPPLY ON MAIN BOARD ..................................................................................................... 3-8
3. POWER SUPPLY ON AMP BOARD ...................................................................................................... 3-9
4. SYSTEM PART ..................................................................................................................................... 3-10
5. NO AUDIO OUTPUT IN OPTICAL FUNCTION .................................................................................... 3-11
6. NO AUDIO OUTPUT IN BT FUNCTION .............................................................................................. 3-11
WAVEFORMS OF MAJOR CHECK POINT
................................................................................................ 3-13
1. SYSTEM PART - MICOM ..................................................................................................................... 3-13
2. SYSTEM PART - LED .......................................................................................................................... 3-13
3. AUDIO PART - OPTICAL INPUT ......................................................................................................... 3-14
4. AUDIO PART - BT UART INPUT ......................................................................................................... 3-14
5. SYSTEM PART - DAC INTERFACE .................................................................................................... 3-15
6. SYSTEM PART - DSP X-TAL I/O ......................................................................................................... 3-15
7. AUDIO PART - DSP I2S ....................................................................................................................... 3-16
8. AUDIO PART - DAC OUTPUT ............................................................................................................. 3-16
9. AUDIO PART - LINE DRIVER OUTPUT .............................................................................................. 3-17
10. AUDIO PART - VOLUME IC OUTPUT ................................................................................................. 3-17
11. AUDIO PART - AMP IC OUTPUT ........................................................................................................ 3-18
WIRING DIAGRAM
........................................................................................................................................ 3-19
BLOCK DIAGRAM
......................................................................................................................................... 3-21
CIRCUIT DIAGRAMS
.................................................................................................................................... 3-23
1. MAIN - SMPS CIRCUIT DIAGRAM ...................................................................................................... 3-23
2. MAIN - POWER CIRCUIT DIAGRAM ................................................................................................... 3-25
3. MAIN - MICOM CIRCUIT DIAGRAM .................................................................................................... 3-27
4. MAIN - AUDIO DSP CIRCUIT DIAGRAM ............................................................................................ 3-29
5. MAIN - DAC/ AMP CIRCUIT DIAGRAM ............................................................................................... 3-31
6. LED CIRCUIT DIAGRAM ...................................................................................................................... 3-33
7. KEY CIRCUIT DIAGRAM ..................................................................................................................... 3-34
CIRCUIT VOLTAGE CHART
........................................................................................................................ 3-35
PRINTED CIRCUIT BOARD DIAGRAMS
.................................................................................................... 3-37
1. MAIN P. C. BOARD .............................................................................................................................. 3-37
2. LED P. C. BOARD ................................................................................................................................ 3-41
3. KEY P. C. BOARD ................................................................................................................................ 3-41