LG RH-2320 Service Manual page 13

ELECTRICAL TROUBLESHOOTING GUIDE
1. POWER SUPPLY ON SMPS BOARD .............3-2
2. POWER SUPPLY ON I/O BOARD ...................3-4
3. SYSTEM CIRCUIT PART ..................................3-9
4. DISC NOT RECOGNIZED.................................3-9
5. WHEN PLAYING DISC, NO AUDIO OUTPUT..........3-10
6. NO OPTICAL/DIGITAL OUTPUT ....................3-11
7. NO TUNER AUDIO OUTPUT .........................3-12
8. NO EXTERNAL AUDIO INPUT.......................3-13
9. NO RGB/COMPONENT VIDEO SIGNAL
WHEN PLAY DISC ...........................................3-14
10. NO COMPOSITE/S-VIDEO SIGNAL
WHEN PLAY DISC............................................3-15
11. NO TV, EXTERNAL INPUT VIDEO
SIGNAL..............................................................3-16
12. NO DV (IEEE1394)
INPUT (VIDEO/AUDIO) SIGNAL.....................3-17
WAVEFORMS
..........................................................3-18
1. SMPS BLOCK ..................................................3-18
2. SYSTEM BLOCK .............................................3-20
3. VIDEO BLOCK (COLOR BAR INPUT)...........3-23
4. AUDIO BLOCK (1kHz SINEWAVE INPUT)....3-24
5. SERIAL INTERFACE BLOCK
(BETWEEN MAIN AND I/O)............................3-25
6. TUNER BLOCK ................................................3-26
7. HDMI BLOCK ...................................................3-27
WIRING CONNECTION DIAGRAM
1. WIRING CONNECTION DIAGRAM 1 ............3-28
2. WIRING CONNECTION DIAGRAM 2 ............3-29
3. WIRING CONNECTION DIAGRAM 3 ............3-30
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
SECTION 3
ELECTRICAL
CONTENTS
BLOCK DIAGRAMS
...........3-2
1. VERALL BLOCK DIAGRAM............................3-31
2. SMPS BLOCK DIAGRAM ...............................3-32
3. POWER MAIN BLOCK DIAGRAM .................3-33
4. POWER I/O BLOCK DIAGRAM......................3-34
5. A/V BLOCK DIAGRAM ....................................3-35
6. AUDIO OUT BLOCK DIAGRAM .....................3-36
7. HDMI BLOCK DIAGRAM ................................3-37
CIRCUIT DIAGRAMS
1. SMPS 1 CIRCUIT DIAGRAM..........................3-39
2. SMPS 2 CIRCUIT DIAGRAM..........................3-41
3. MPEG CIRCUIT DIAGRAM.............................3-43
4. FLASH/DDR/DV CIRCUIT DIAGRAM............3-45
5. ATAPI, HDMI & USB CIRCUIT DIAGRAM .....3-47
6. I/O, µ-COM CIRCUIT DIAGRAM ....................3-49
7. DECODER & MIC CIRCUIT DIAGRAM.........3-51
8. SCART/RCA CIRCUIT DIAGRAM ..................3-53
9. HDMI CIRCUIT DIAGRAM ..............................3-55
10. TIMER CIRCUIT DIAGRAM (8 & 9 TOOLS)...3-57
11. KEY CIRCUIT DIAGRAM (8 & 9 TOOLS) ......3-59
• CIRCUIT VOLTAGE CHART
PRINTED CIRCUIT BOARD DIAGRAMS
1. MAIN P.C.BOARD ............................................3-65
2. I/O P.C.BOARD.................................................3-67
3. POWER P.C.BOARD .......................................3-71
4. TIMER & KEY P.C.BOARD..............................3-73
...............3-28
5. HDMI P.C.BOARD ............................................3-75
6. KARAOKE P.C.BOARD ...................................3-75
3-1
.............................................3-31
...........................................3-39
....................3-61
...3-65
LGE Internal Use Only