LG BP340 Service Manual page 16

ONE POINT REPAIR GUIDE .......................................................................................................................... 3-2
1. NO BOOTING WHEN YOU TURN THE UNIT ON ................................................................................. 3-2
ELECTRICAL TROUBLESHOOTING GUIDE ............................................................................................... 3-5
1. SMPS TROUBLESHOOTING FLOW ..................................................................................................... 3-5
2. UNIT POWER CHECK FLOW ................................................................................................................ 3-6
3. UNIT CANNOT POWER ON .................................................................................................................. 3-6
4. REMOTE CONTROL DOES NOT WORK .............................................................................................. 3-7
5. KEYS DO NOT WORK ........................................................................................................................... 3-7
6. NO HDMI OUTPUT ................................................................................................................................. 3-8
7. CANNOT READ DISC OR TRAY OPEN/CLOSE ................................................................................... 3-8
8. CANNOT READ USB DEVICE CONTENT ............................................................................................ 3-9
9. CANNOT CONNECT TO WIRELESS NETWORK ................................................................................. 3-9
WAVEFORMS ON SYSTEM TEST .............................................................................................................. 3-10
1. POWER ON SYSTEM RESET SEQUENCE ........................................................................................ 3-10
2. SYSTEM 27 MHZ CLOCK WAVEFORM .............................................................................................. 3-10
BLOCK DIAGRAM ......................................................................................................................................... 3-11
CIRCUIT DIAGRAMS .................................................................................................................................... 3-13
1. SMPS - POWER CIRCUIT DIAGRAM.................................................................................................. 3-13
2. SMPS - KEY/ LED/ USB PORT/ IR CIRCUIT DIAGRAM .................................................................... 3-15
3. MAIN - POWER SOURCE CIRCUIT DIAGRAM .................................................................................. 3-17
4. MAIN - DDR3 #1 CIRCUIT DIAGRAM ................................................................................................. 3-19
5. MAIN - DDR3 #2 CIRCUIT DIAGRAM ................................................................................................. 3-21
6. MAIN - HDMI CIRCUIT DIAGRAM ....................................................................................................... 3-23
7. MAIN - USB CIRCUIT DIAGRAM ......................................................................................................... 3-25
8. MAIN - MICOM CIRCUIT DIAGRAM .................................................................................................... 3-27
9. MAIN - FRONT END CIRCUIT DIAGRAM ........................................................................................... 3-29
10. MAIN - MOTOR DRIVE CIRCUIT DIAGRAM ....................................................................................... 3-31
CIRCUIT VOLTAGE CHART ........................................................................................................................ 3-33
1. ICs ......................................................................................................................................................... 3-33
2. TRs & FETs .......................................................................................................................................... 3-36
3. DIODES & IR ........................................................................................................................................ 3-36
4. CAPACITORS ....................................................................................................................................... 3-36
5. CONNECTORS ..................................................................................................................................... 3-37
PRINTED CIRCUIT BOARD DIAGRAMS .................................................................................................... 3-39
1. MAIN P.C.BOARD ................................................................................................................................ 3-39
2. SMPS P.C. BOARD .............................................................................................................................. 3-41
SECTION 3
ELECTRICAL
CONTENTS
3-1