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LHD645
LG LHD645 Service Manual
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2-38
ELECTRICAL TROUBLESHOOTING GUIDE
No 5.5 VA
Is F901 normal?
Replace F901 (same fuse).
YES
YES
NO
Is TH901 normal?
Is the VCC
(11 V ~ 25 V) supplied to IC901
pin7?
Is BD901 normal?
Is D952, D953 normal?
Replace TH901.
Check or replace.
Replace BD901.
Replace D952, D953.
YES
YES
YES
YES
NO
NO
NO
NO
1. SYSTEM POWER SUPPLY ON SMPS BOARD
Power line of MAIN board is short.
50
52
Table of Contents
Section 1 Summary
3
Table of Contents
3
Servicing Precautions
4
Esd Precautions
6
Hidden Key Mode
7
Firmware Upgrade Guide
9
Specifications
11
Section 2 Electrical
14
Digital Display & Media Training Master
15
Distorted Picture
15
Picture
20
Picture Color
25
Noise/Audio Problems
27
Miscellaneous
30
One Point Repair Guide
39
Power Problem
39
Booting When You Turn the Unit On, no Message on Front Panel
41
Bad Hdmi Video / Audio Output
47
Audio from Speaker
48
Usb
49
Bt Connection Error
50
Electrical Troubleshooting Guide
51
System Power Supply on Smps Board
51
Power Supply on Main Board
54
System Part
56
Hdmi Output
58
Audio Output
59
Details and Waveforms on System Test and Debugging
60
SYSTEM PART (MPEG CRYSTAL 27 Mhz)
60
Sdram Clock
61
Video Part (100% Full Color-Bar)
61
Hdmi Part
62
Servo Open/Close Signal
63
Wiring Diagram
72
Block Diagram
73
Circuit Diagrams
74
Smps Circuit Diagram
74
Main & Amp - Mpeg Circuit Diagram
75
Main & Amp - Servo Circuit Diagram
76
Main & Amp - I/O Circuit Diagram
77
Main & Amp - Micom Circuit Diagram
78
Main & Amp - Pwm Circuit Diagram
79
Main & Amp - Amp Circuit Diagram
80
Jack Circuit Diagram
81
Front Circuit Diagram
82
Capacitors
83
Circuit Voltage Chart
83
Connectors
83
Ics
83
Printed Circuit Board Diagrams
84
Smps P. C. Board
84
Main & Amp P. C. Board
85
Front P. C. Board
86
Jack P. C. Board
86
Cabinet and Main Frame Section
90
Exploded Views
90
Deck Mechanism Section
91
Packing Accessory Section
92
Center Speaker
93
Speaker Section
93
Front/ Rear Speaker
94
Passive Subwoofer
95
Other manuals for LG LHD645
Owner's Manual
78 pages
Simple Manual
38 pages
4
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LG LHD645 Specifications
General
Brand
LG
Model
LHD645
Category
Home Theater System
Language
English
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