LG HR832T Service Manual page 16

DIGITAL DISPLAY & MEDIA TRAINING MASTER
ONE POINT REPAIR GUIDE
1. NO POWER PROBLEM ....................................................................................................................... 3-68
2. VFD DOESN'T DISLPAY ...................................................................................................................... 3-69
3. NO BOOTING WHEN YOU TURN THE UNIT ON, "HELLO" OR "WAIT" ON FRONT PANEL ........... 3-70
4. NO HDD DETECTED ........................................................................................................................... 3-75
5. DISC TRAY CAN NOT OPEN, CLOSE/ DISC READING PROBLEM ................................................. 3-76
6. NO FLD DISPLAY/ NO REMOTE CONTROL ...................................................................................... 3-77
ELECTRICAL TROUBLESHOOTING GUIDE
1. POWER SUPPLY ON SMPS BOARD .................................................................................................. 3-78
2. POWER SUPPLY ON MAIN BOARD ................................................................................................... 3-82
3. POWER ON .......................................................................................................................................... 3-86
4. SYSTEM PART ..................................................................................................................................... 3-87
5. NO CVBS VIDEO OUTPUT WHEN PLAY DISC .................................................................................. 3-89
6. NO COAXIAL OUTPUT WHEN PLAY DISC ........................................................................................ 3-90
7. NO ANALOG AUDIO L/R OUTPUT WHEN PLAY DISC ...................................................................... 3-91
8. NO HDMI OUTPUT WHEN PLAY DISC ............................................................................................... 3-92
9. NO DVB-T TUNER OUTPUT ................................................................................................................ 3-93
WAVEFORMS
............................................................................................................................................. 3-94
1. SYSTEM PART ..................................................................................................................................... 3-94
2. SYSTEM PART - MEMORY ................................................................................................................. 3-95
3. HDMI PART .......................................................................................................................................... 3-96
WIRING DIAGRAM
.................................................................................................................................... 3-97
BLOCK DIAGRAMS
1. OVERALL BLOCK DIAGRAM .............................................................................................................. 3-99
2. SMPS BOARD BLOCK DIAGRAM ..................................................................................................... 3-100
3. MAIN BOARD - SYSTEM BLOCK DIAGRAM .................................................................................... 3-101
4. MAIN BOARD - INPUT/ OUTPUT BLOCK DIAGRAM ....................................................................... 3-102
5. MAIN BOARD - TUNER BLOCK DIAGRAM ...................................................................................... 3-103
6. FRONT TIMER BOARD BLOCK DIAGRAM....................................................................................... 3-104
7. MAIN BOARD POWER SIGNAL ........................................................................................................ 3-105
8. MAIN BOARD - SYSTEM & TUNER POWER SIGNAL ..................................................................... 3-106
9. MAIN BOARD - INPUT/ OUTPUT POWER SIGNAL ......................................................................... 3-107
10. FRONT TIMER BOARD POWER SIGNAL ......................................................................................... 3-108
CIRCUIT DIAGRAMS
1. SMPS CIRCUIT DIAGRAM ................................................................................................................ 3-109
2. MAIN - POWER CIRCUIT DIAGRAM ................................................................................................. 3-111
3. MAIN - MICOM CIRCUIT DIAGRAM .................................................................................................. 3-113
4. MAIN - BCM7632 #1 CIRCUIT DIAGRAM ......................................................................................... 3-115
5. MAIN - BCM7632 #2 CIRCUIT DIAGRAM ......................................................................................... 3-117
6. MAIN - DDR3 NAND CIRCUIT DIAGRAM ......................................................................................... 3-119
7. MAIN - FRONT END CIRCUIT DIAGRAM ......................................................................................... 3-121
8. MAIN - A/V OUTPUT CIRCUIT DIAGRAM ......................................................................................... 3-123
9. MAIN - USB HUB CIRCUIT DIAGRAM .............................................................................................. 3-125
10. MAIN - DVB-T TUNER/ 3D CIRCUIT DIAGRAM ............................................................................... 3-127
11. FRONT TIMER CIRCUIT DIAGRAM .................................................................................................. 3-129
CIRCUIT VOLTAGE CHART
PRINTED CIRCUIT BOARD DIAGRAMS
1. MAIN P.C.BOARD .............................................................................................................................. 3-133
2. SMPS P.C.BOARD ............................................................................................................................. 3-137
3. FRONT TIMER P.C. BOARD .............................................................................................................. 3-139
SECTION 3 ELECTRICAL
CONTENTS
................................................................................................................. 3-68
................................................................................................................................. 3-99
............................................................................................................................. 3-109
............................................................................................................... 3-131
........................................................................................ 3-133
......................................................................... 3-2
.................................................................................. 3-78
3-1