LG S94T1-S Service Manual page 16

DIGITAL DISPLAY & MEDIA TRAINING MASTER ............................................................................................................. 2-2
1. DISTORTED PICTURE .............................................................................................................................................. 2-2
2. NO PICTURE ............................................................................................................................................................. 2-7
3. PICTURE COLOR .................................................................................................................................................... 2-12
4. NOISE/AUDIO PROBLEMS ..................................................................................................................................... 2-14
5. MISCELLANEOUS ................................................................................................................................................... 2-17
6. BLU-RAY PLAYER ................................................................................................................................................... 2-26
ONE POINT REPAIR GUIDE .............................................................................................................................................. 2-27
1. NO POWER PROBLEM ........................................................................................................................................... 2-27
2. NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE OR "WELCOME" ON FRONT PANEL .......... 2-29
3. WIRED NETWORK CONNECTION ERROR ........................................................................................................... 2-39
4. WIRELESS NETWORK CONNECTION ERROR .................................................................................................... 2-40
5. BAD HDMI VIDEO / AUDIO OUTPUT ..................................................................................................................... 2-41
6. NO AUDIO FROM SPEAKER .................................................................................................................................. 2-42
7. NO USB .................................................................................................................................................................... 2-43
ELECTRICAL TROUBLESHOOTING GUIDE ..................................................................................................................... 2-44
1. SYSTEM POWER SUPPLY ON SMPS BOARD ..................................................................................................... 2-44
2. AMP POWER SUPPLY ON SMPS BOARD ............................................................................................................ 2-47
3. POWER SUPPLY ON MAIN BOARD ...................................................................................................................... 2-48
4. SYSTEM PART ........................................................................................................................................................ 2-54
5. NO HDMI OUTPUT .................................................................................................................................................. 2-56
6. NO AUDIO OUTPUT ................................................................................................................................................ 2-57
WAVEFORMS ...................................................................................................................................................................... 2-58
1. SYSTEM PART - 1 (MPEG CRYSTAL 27 MHZ) ..................................................................................................... 2-58
2. SYSTEM PART - 2 (DDR3 MEMORY) .................................................................................................................... 2-59
3. SYSTEM PART - 3 (eMMC FLASH MEMORY)....................................................................................................... 2-60
4. AUDIO PART - 1 (S/PDIF) ....................................................................................................................................... 2-61
5. AUDIO PART - 2 (I2S) ............................................................................................................................................. 2-62
6. HDMI PART .............................................................................................................................................................. 2-63
WIRING DIAGRAM .............................................................................................................................................................. 2-65
BLOCK DIAGRAM .............................................................................................................................................................. 2-67
CIRCUIT DIAGRAMS .......................................................................................................................................................... 2-69
1. SMPS CIRCUIT DIAGRAM ...................................................................................................................................... 2-69
2. MAIN - MICOM CIRCUIT DIAGRAM ....................................................................................................................... 2-71
3. MAIN - POWER CIRCUIT DIAGRAM ...................................................................................................................... 2-73
4. MAIN - MPEG CIRCUIT DIAGRAM ......................................................................................................................... 2-75
5. MAIN - MEMORY CIRCUIT DIAGRAM ................................................................................................................... 2-77
6. MAIN - FRONT END CIRCUIT DIAGRAM .............................................................................................................. 2-79
7. MAIN - DSP CIRCUIT DIAGRAM ............................................................................................................................ 2-81
8. MAIN - ADC/ MIC CIRCUIT DIAGRAM ................................................................................................................... 2-83
9. MAIN - I/O CIRCUIT DIAGRAM ............................................................................................................................... 2-85
10. AMP - PWM CIRCUIT DIAGRAM ............................................................................................................................ 2-87
11. AMP - AMP CIRCUIT DIAGRAM ............................................................................................................................. 2-89
12. JACK CIRCUIT DIAGRAM (OPTIONAL PART) ....................................................................................................... 2-91
13. FRONT CIRCUIT DIAGRAM .................................................................................................................................... 2-95
14. TOUCH CIRCUIT DIAGRAM ................................................................................................................................... 2-97
CIRCUIT VOLTAGE CHART ............................................................................................................................................... 2-99
PRINTED CIRCUIT BOARD DIAGRAMS ......................................................................................................................... 2-101
1. SMPS P. C. BOARD .............................................................................................................................................. 2-101
2. MAIN P. C. BOARD ............................................................................................................................................... 2-103
3. AMP P. C. BOARD ................................................................................................................................................. 2-107
4. JACK P. C. BOARD (OPTIONAL PART) ............................................................................................................... 2-109
5. FRONT P. C. BOARD ............................................................................................................................................ 2-111
6. TOUCH P. C. BOARD ............................................................................................................................................ 2-111
SECTION 2 ELECTRICAL
CONTENTS
2-1