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LG SPH7B-W User Manual

LG SPH7B-W
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3-1
SECTION 3
ELECTRICAL
CONTENTS
ONE POINT REPAIR GUIDE ............................................................................................................................ 3-2
1. IF THERE IS NO SOUND OR HAVE A PROBLEM ON LCD. ............................................................... 3-2
2. IF THE SET DOESN’T BOOTING WHEN YOU TURN ON THE SET ................................................... 3-3
3. IF THE SET DOESN’T BOOTING WHEN YOU TURN ON THE SET ................................................... 3-4
4. IF THE SET DOESN’T BOOTING WHEN YOU TURN ON THE SET ................................................... 3-5
5. IF THE SET DOESN’T BOOTING WHEN YOU TURN ON THE SET (LED DOES NOT TURN ON) ... 3-6
6. IF THE SET DOESN’T BOOTING WHEN YOU TURN ON THE SET. .................................................. 3-7
7. IF THERE IS NO SOUND. ...................................................................................................................... 3-8
8. IF THE SET DOESN’T BOOTING WHEN YOU TURN ON THE SET ................................................... 3-9
9. IF THE SET DOESN’T BOOTING WHEN YOU TURN ON THE SET (LED DOES NOT TURN ON) . 3-10
10. NO SOUND FROM THE R ch SPEAKER. ........................................................................................... 3-11
11. NO SOUND FROM THE L ch SPEAKER. ............................................................................................ 3-12
12. IF NOT BOOTING WHEN YOU TURN ON THE SET. ......................................................................... 3-13
13. IF NOT BOOTING WHEN YOU TURN ON THE SET. ......................................................................... 3-14
14. IF NOT BOOTING WHEN YOU TURN ON THE SET. ......................................................................... 3-15
15. WIRED NETWORK CONNECTION ERROR. ...................................................................................... 3-16
16. PORTABLE FUNCTION DOESN’T WORKING .................................................................................... 3-17
17. OPTICAL FUNCTION DOESN’T WORKING ........................................................................................ 3-18
18. BLUETOOTH FUNCTION DOESN’T WORKING ................................................................................. 3-19
19. HDMI FUNCTION DOESN’T WORKING .............................................................................................. 3-20
20. Wi-Fi FUNCTION DOESN’T WORKING ............................................................................................... 3-21
21. WIRELESS WOOFER CONNECTION DOESN’T WORKING .............................................................. 3-22
22. D(DC) PROTECTION ........................................................................................................................... 3-23
23. S(SHUT DOWN) PROTECTION ........................................................................................................... 3-24
24. B(BURNT) PROTECTION .................................................................................................................... 3-25
WAVEFORMS OF MAJOR CHECK POINT .................................................................................................... 3-26
1. MPEG X-TAL ........................................................................................................................................ 3-26
2. PWM X-TAL .......................................................................................................................................... 3-26
3. MPEG .................................................................................................................................................... 3-27
WIRING DIAGRAM .......................................................................................................................................... 3-29
BLOCK DIAGRAMS ........................................................................................................................................ 3-31
1. SYSTEM BLOCK DIAGRAM ................................................................................................................ 3-31
2. POWER BLOCK DIAGRAM ................................................................................................................. 3-33
CIRCUIT DIAGRAMS ...................................................................................................................................... 3-35
1. MAIN - MICOM CIRCUIT DIAGRAM .................................................................................................... 3-35
2. MAIN - MPEG CIRCUIT DIAGRAM ...................................................................................................... 3-37
3. MAIN - MEMORY CIRCUIT DIAGRAM ................................................................................................ 3-39
4. MAIN - ADC & I/O CIRCUIT DIAGRAM ............................................................................................... 3-41
5. MAIN - DC_DC CIRCUIT DIAGRAM .................................................................................................... 3-43
6. MAIN - AMP CIRCUIT DIAGRAM......................................................................................................... 3-45
7. FRONT CIRCUIT DIAGRAM ................................................................................................................ 3-47
8. KEY CIRCUIT DIAGRAM ..................................................................................................................... 3-49
CIRCUIT VOLTAGE CHART ........................................................................................................................... 3-51
1. ICs ......................................................................................................................................................... 3-51
2. CAPACITORS ....................................................................................................................................... 3-53
3. CONNECTORS ..................................................................................................................................... 3-53
PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 3-55
1. MAIN P. C. BOARD DIAGRAM ............................................................................................................ 3-55
2. FRONT P. C. BOARD DIAGRAM ......................................................................................................... 3-57
3. KEY P. C. BOARD DIAGRAM .............................................................................................................. 3-57

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LG SPH7B-W Specifications

General IconGeneral
BrandLG
ModelSPH7B-W
CategorySpeaker System
LanguageEnglish

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