LG SPK8-W Service Manual

3-1
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
SECTION 3
ELECTRICAL
CONTENTS
WIRING DIAGRAM ............................................................................................................................................ 3-2
BLOCK DIAGRAMS .......................................................................................................................................... 3-3
1. SYSTEM BLOCK DIAGRAM .................................................................................................................. 3-3
2. POWER BLOCK DIAGRAM ................................................................................................................... 3-4
ONE POINT REPAIR GUIDE ............................................................................................................................ 3-5
1. NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE OR “HELLO”
ON FRONT PANEL ................................................................................................................................. 3-5
2. NO SOUND ............................................................................................................................................. 3-8
3. PROTECTION ERROR ......................................................................................................................... 3-12
WAVEFORMS OF MAJOR CHECK POINT .................................................................................................... 3-15
1. CRYSTAL .............................................................................................................................................. 3-15
2. FLASH ................................................................................................................................................... 3-16
3. REMOTE CONTROL ............................................................................................................................ 3-17
4. OPTICAL ............................................................................................................................................... 3-18
CIRCUIT VOLTAGE CHART ........................................................................................................................... 3-19
1. ICs ......................................................................................................................................................... 3-19
2. CAPACITORS ....................................................................................................................................... 3-20
3. CONNECTORS ..................................................................................................................................... 3-20
PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 3-21
1. SMPS P. C. BOARD DIAGRAM ........................................................................................................... 3-21
2. MAIN P. C. BOARD DIAGRAM ............................................................................................................ 3-23
3. JACK P. C. BOARD DIAGRAM ............................................................................................................ 3-27
4. FRONT P. C. BOARD DIAGRAM ......................................................................................................... 3-29
5. KEY P. C. BOARD DIAGRAM .............................................................................................................. 3-29

LG SPK8-W Specifications

General

Brand	LG
Model	SPK8-W
Category	Speaker System
Language	English