VSX-LX50
4
1
2
3
4
1
2
3
4
C
D
F
A
B
E
CONTENTS
SAFETY INFORMATION..................................................................................................................................... 2
1. SERVICE PRECAUTIONS ............................................................................................................................... 6
1.1 NOTES ON SOLDERING .......................................................................................................................... 6
2. SPECIFICATIONS............................................................................................................................................ 7
2.1 ACCESSORIES ......................................................................................................................................... 7
2.2 SPECIFICATIONS ..................................................................................................................................... 8
2.3 PANEL FACILITIES.................................................................................................................................. 10
3. BASIC ITEMS FOR SERVICE........................................................................................................................ 20
3.1 CHECK POINTS AFTER SERVICING..................................................................................................... 20
3.2 PCB LOCATIONS .................................................................................................................................... 21
3.3 JIGS LIST ................................................................................................................................................ 23
4. BLOCK DIAGRAM.......................................................................................................................................... 24
4.1 OVERALL WIRING DIAGRAM ................................................................................................................ 24
4.2 BLOCK DIAGRAM for AUDIO BLOCK .................................................................................................... 26
4.3 BLOCK DIAGRAM for VIDEO BLOCK..................................................................................................... 28
5. DIAGNOSIS.................................................................................................................................................... 30
5.1 DIAGNOSIS FLOWCHART ..................................................................................................................... 30
5.2 CIRCUIT DESCRIPTION ......................................................................................................................... 70
6. SERVICE MODE ............................................................................................................................................ 72
6.1 TEST MODE ............................................................................................................................................ 72
7. DISASSEMBLY .............................................................................................................................................. 75
8. EACH SETTING AND ADJUSTMENT ........................................................................................................... 82
8.1 ADJUSTMENT......................................................................................................................................... 82
8.2 HOW TO UPDATE FIRMWARE............................................................................................................... 82
9. EXPLODED VIEWS AND PARTS LIST.......................................................................................................... 88
9.1 PACKING ................................................................................................................................................. 88
9.2 EXTERIOR SECTION.............................................................................................................................. 90
9.3 CHASSIS SECTION ................................................................................................................................ 92
9.4 REAR SECTION ...................................................................................................................................... 94
9.5 POWER AMP SECTION.......................................................................................................................... 98
9.6 FRONT PANEL SECTION ..................................................................................................................... 100
10. SCHEMATIC DIAGRAM............................................................................................................................. 102
10.1 AUDIO IN ASSY (1/2) .......................................................................................................................... 102
10.2 AUDIO IN (2/2) and 12V-REG ASSYS................................................................................................. 104
10.3 MAIN CONTROL ASSY (1/3)............................................................................................................... 106
10.4 MAIN CONTROL (2/3), GUARD-C and GUARD-F ASSYS ................................................................. 108
10.5 MAIN CONTROL ASSY (3/3)................................................................................................................110
10.6 DSP ASSY (1/4)....................................................................................................................................112
10.7 DSP ASSY (2/4)....................................................................................................................................114
10.8 DSP ASSY (3/4)....................................................................................................................................116
10.9 DSP ASSY (4/4)....................................................................................................................................118
10.10 COMPOSITE ASSY ........................................................................................................................... 120
10.11 S-VIDEO and BRIDGE 2 ASSYS....................................................................................................... 122
10.12 COMPONENT ASSY ......................................................................................................................... 124
10.13 DISPLAY, VOLUME and MULTI JOG ASSYS.................................................................................... 126
10.14 HEADPHONE, FRONT-IN, PRIMARY and TRANS 1 ASSYS........................................................... 128
10.15 TRANS 2-1, DIODE 1, VH TR, BRIDGE 1 and PS/SP ASSYS ......................................................... 130
10.16 TRANS 2-2, TRANS SIDE, LOCAL P-SUPPLY, DC/DC, IR I/O and VIDEO CONNECT ASSYS ..... 132
10.17 POWER AMP-L, POSI 1-L and POSI 2-L ASSYS............................................................................. 134
10.18 POWER AMP-R and POSI 1-R ASSYS............................................................................................. 136
10.19 POWER AMP IN and POWER PROTECT ASSYS ........................................................................... 138
10.20 HDMI & DVC ASSY (1/2)................................................................................................................... 140
10.21 HDMI & DVC ASSY (2/2)................................................................................................................... 142
10.22 USB ASSY (VSX-LX50 ONLY) .......................................................................................................... 144
11. PCB CONNECTION DIAGRAM.................................................................................................................. 147
11.1 AUDIO IN ASSY................................................................................................................................... 148
11.2 12V-REG ASSY.................................................................................................................................... 152
11.3 BRIDGE 2 ASSY .................................................................................................................................. 153
11.4 MAIN CONTROL ASSY ....................................................................................................................... 154
11.5 DSP ASSY ........................................................................................................................................... 158
11.6 COMPOSITE ASSY ............................................................................................................................. 162
11.7 S-VIDEO ASSY .................................................................................................................................... 166
11.8 COMPONENT ASSY ........................................................................................................................... 170
11.9 DISPLAY ASSY.................................................................................................................................... 174
11.10 VOLUME ASSY.................................................................................................................................. 178
