LG SL8YG, Руководство по обслуживанию

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3-1 Copyright © 2019 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 ............................................................................................................................................. 3-9
3. PROTECTION ERROR ......................................................................................................................... 3-13
WAVEFORMS OF MAJOR CHECK POINT .................................................................................................... 3-16
1. CRYSTAL .............................................................................................................................................. 3-15
2. REMOTE CONTROL ............................................................................................................................ 3-19
3. OPTICAL ............................................................................................................................................... 3-20
CIRCUIT VOLTAGE CHART ........................................................................................................................... 3-21
1. ICs ......................................................................................................................................................... 3-21
2. CAPACITORS ....................................................................................................................................... 3-24
3. CONNECTORS ..................................................................................................................................... 3-24
PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 3-25
1. MAIN P. C. BOARD DIAGRAM ............................................................................................................ 3-25
2. DSP P. C. BOARD DIAGRAM .............................................................................................................. 3-27
3. AMP P. C. BOARD DIAGRAM ............................................................................................................. 3-29
4. FRONT LED P. C. BOARD DIAGRAM ................................................................................................. 3-31
5. MIC & TOUCH P. C. BOARD DIAGRAM ............................................................................................. 3-31