LG SPK5B-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 DIAGRAM ............................................................................................................................................ 3-3
ONE POINT REPAIR GUIDE ............................................................................................................................ 3-4
1. NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE OR “HELLO”
ON FRONT PANEL ................................................................................................................................. 3-4
2. NO SOUND ............................................................................................................................................. 3-7
3. PROTECTION ERROR ......................................................................................................................... 3-11
WAVEFORMS OF MAJOR CHECK POINT .................................................................................................... 3-14
1. CRYSTAL .............................................................................................................................................. 3-14
2. FLASH MEMORY ................................................................................................................................. 3-14
3. TACT KEY ............................................................................................................................................. 3-15
4. REMOTE CONTROL ............................................................................................................................ 3-17
5. OPTICAL ............................................................................................................................................... 3-18
CIRCUIT VOLTAGE CHART ........................................................................................................................... 3-19
PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 3-23
1. MAIN P. C. BOARD DIAGRAM ............................................................................................................ 3-23
2. FRONT P. C. BOARD DIAGRAM ......................................................................................................... 3-25
3. KEY P. C. BOARD DIAGRAM .............................................................................................................. 3-25

LG SPK5B-W Specifications

General

Brand	LG
Model	SPK5B-W
Category	Speaker System
Language	English