LG BPM54, Service Manual

Page: 14 / 91

3-1
SECTION 3
ELECTRICAL
CONTENTS
DIGITAL DISPLAY & MEDIA TRAINING MASTER
..................................................................................... 3-2
1. DISTORTED PICTURE ........................................................................................................................... 3-2
2. NO PICTURE .......................................................................................................................................... 3-7
3. PICTURE COLOR ................................................................................................................................. 3-12
4. NOISE/AUDIO PROBLEMS .................................................................................................................. 3-14
5. MISCELLANEOUS ................................................................................................................................ 3-17
6. BLU-RAY PLAYER ............................................................................................................................... 3-26
ONE POINT REPAIR GUIDE
........................................................................................................................ 3-27
1. NO POWER PROBLEM ....................................................................................................................... 3-27
2. CLOCK DOESN’T DISPLAY ................................................................................................................. 3-29
3. NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE OR
“HELLO” ON FRONT PANEL ............................................................................................................... 3-30
4. WIRED NETWORK CONNECTION ERROR ....................................................................................... 3-39
5. WIRELESS NETWORK CONNECTION ERROR ................................................................................. 3-40
6. BAD HDMI VIDEO / AUDIO OUTPUT .................................................................................................. 3-41
ELECTRICAL TROUBLESHOOTING GUIDE
............................................................................................. 3-42
1. SMPS TROUBLESHOOTING FLOW ................................................................................................... 3-42
2. POWER SUPPLY ON SMPS BOARD .................................................................................................. 3-43
3. POWER SUPPLY ON MAIN BOARD ................................................................................................... 3-45
4. SYSTEM PART ..................................................................................................................................... 3-47
5. NO HDMI OUTPUT ............................................................................................................................... 3-49
WAVEFORMS OF MAJOR CHECK POINT
................................................................................................ 3-50
1. SYSTEM PART - 1 ............................................................................................................................... 3-50
2. SYSTEM PART - 2 (SYSTEM MEMORY) ............................................................................................ 3-51
3. HDMI PART .......................................................................................................................................... 3-52
WIRING DIAGRAMS
...................................................................................................................................... 3-53
BLOCK DIAGRAMS
...................................................................................................................................... 3-54
1. SYSTEM BLOCK DIAGRAM ................................................................................................................ 3-54
2. SMPS BLOCK DIAGRAM ..................................................................................................................... 3-55
CIRCUIT DIAGRAMS
.................................................................................................................................... 3-57
1. SMPS & TIMER CIRCUIT DIAGRAM ................................................................................................... 3-57
2. MAIN - DC-DC CIRCUIT DIAGRAM ..................................................................................................... 3-59
3. MAIN - MPEG CIRCUIT DIAGRAM ...................................................................................................... 3-61
4. MAIN - MEMORY & STRAP CIRCUIT DIAGRAM................................................................................ 3-63
5. MAIN - FRONT END CIRCUIT DIAGRAM ........................................................................................... 3-65
6. MAIN - A/V OUTPUT CIRCUIT DIAGRAM ........................................................................................... 3-67
CIRCUIT VOLTAGE CHART
........................................................................................................................ 3-69
PRINTED CIRCUIT BOARD DIAGRAMS
.................................................................................................... 3-71
1. MAIN P.C.BOARD ................................................................................................................................ 3-71
2. SMPS & TIMER P.C. BOARD .............................................................................................................. 3-73