LG BPM55 - Section 3: Electrical and Troubleshooting

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. LED DOESN’T LIGHT ON .................................................................................................................... 3-28
3. NO BOOTING WHEN YOU TURN THE UNIT ON ............................................................................... 3-29
4. BAD HDMI VIDEO / AUDIO OUTPUT .................................................................................................. 3-38
5. WIRED NETWORK CONNECTION ERROR - (OPTION PART) ......................................................... 3-39
6. WIRELESS NETWORK CONNECTION ERROR - (OPTION PART)................................................... 3-40
ELECTRICAL TROUBLESHOOTING GUIDE ................................................................................................. 3-41
1. POWER SUPPLY ON MAIN BOARD ................................................................................................... 3-41
2. SYSTEM PART ..................................................................................................................................... 3-43
3. NO HDMI OUTPUT ............................................................................................................................... 3-45
WAVEFORMS OF MAJOR CHECK POINT .................................................................................................... 3-46
1. SYSTEM PART - 1 ............................................................................................................................... 3-46
2. SYSTEM PART - 2 (SYSTEM MEMORY) ............................................................................................ 3-47
3. HDMI PART .......................................................................................................................................... 3-48
WIRING DIAGRAMS ....................................................................................................................................... 3-49
BLOCK DIAGRAM .......................................................................................................................................... 3-50
CIRCUIT DIAGRAMS ...................................................................................................................................... 3-51
1. MAIN - DC-DC CIRCUIT DIAGRAM ..................................................................................................... 3-51
2. MAIN - MPEG CIRCUIT DIAGRAM ...................................................................................................... 3-53
3. MAIN - MEMORY & STRAP CIRCUIT DIAGRAM................................................................................ 3-55
4. MAIN - FRONT END CIRCUIT DIAGRAM ........................................................................................... 3-57
5. MAIN - A/V OUTPUT CIRCUIT DIAGRAM ........................................................................................... 3-59
6. TIMER CIRCUIT DIAGRAM.................................................................................................................. 3-61
CIRCUIT VOLTAGE CHART ........................................................................................................................... 3-63
PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 3-65
1. MAIN P.C.BOARD ................................................................................................................................ 3-65
2. TIMER P.C. BOARD ............................................................................................................................. 3-65