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SPH7B-W
LG SPH7B-W User Manual
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3-8
ONE POINT REPAIR GUIDE
7. IF THERE IS NO SOUND.
7-1. IC304 (NO PWM_3.3V)
7-1-1.
Solution
Replace IC304 on MAIN board.
7-1-2. How to troubleshoot (Countermeasure)
1) Please, check PWM_3.3V of L307 of IC304 pin6 (VOUT).
2) If PWM_3.3V is abnormal, check 3.3VA pin1 (VIN).
3) If 3.3 VA is OK, please replace IC304.
If R334 is not high state, follow the stage 9-1 (IC100).
7-1-3. Service hint (Any picture / Remark)
< MAIN board top view >
IC304
IC304
38
40
Table of Contents
Section 1 Summary
3
Table of Contents
3
Product Safety Servicing Guidelines for Audio Products
4
Servicing Precautions
5
General Servicing Precautions
5
Insulation Checking Prodedure
5
Electrostatically Sensitive (Es) Devices
5
Wireless Subwoofer Connection
6
Hidden Mode
7
Lan Update Guide
8
Software Update Guide
12
Version Check
16
Option Edit Guide
17
Specifications
18
Section 2 Cabinet & Main Chassis
20
Disassembly Instructions
21
How to Disassemble the Main Set
22
How to Disassemble the Woofer
26
Exploded Views
28
Main Set Section
28
Wireless Subwoofer Section
29
Packing Accessory Section
30
Section 3 Electrical
32
One Point Repair Guide
33
If There Is no Sound or Have a Problem on Lcd
33
If the Set Doesn't Booting When You Turn on the Set
34
If the Set Doesn't Booting When You Turn on the Set
36
If the Set Doesn't Booting When You Turn on the Set (Led Does Not Turn On)
37
If the Set Doesn't Booting When You Turn on the Set
38
If There Is no Sound
39
If the Set Doesn't Booting When You Turn on the Set
40
If the Set Doesn't Booting When You Turn on the Set (Led Does Not Turn On)
41
SOUND from the R Ch SPEAKER
42
SOUND from the L Ch SPEAKER
43
If Not Booting When You Turn on the Set
44
If Not Booting When You Turn on the Set
46
Wired Network Connection Error
47
Portable Function Doesn't Working
48
Optical Function Doesn't Working
49
Bluetooth Function Doesn't Working
50
Hdmi Function Doesn't Working
51
Wi-Fi FUNCTION DOESN'T WORKING
52
Wireless Woofer Connection Doesn't Working
53
D(DC) Protection
54
S(Shut Down) Protection
55
B(Burnt) Protection
56
Waveforms of Major Check Point
57
Mpeg X-Tal
57
Pwm X-Tal
57
Mpeg
58
Wiring Diagram
60
Block Diagrams
61
System Block Diagram
61
Power Block Diagram
62
Circuit Diagrams
63
Main - Micom Circuit Diagram
63
Main - Mpeg Circuit Diagram
64
Main - Memory Circuit Diagram
65
Main - Adc & I/O Circuit Diagram
66
Main - Dc_Dc Circuit Diagram
67
Main - Amp Circuit Diagram
68
Front Circuit Diagram
69
Key Circuit Diagram
70
Circuit Voltage Chart
71
Ics
71
Capacitors
72
Connectors
72
Printed Circuit Board Diagrams
73
Main P. C. Board Diagram
73
Front P. C. Board Diagram
74
Key P. C. Board Diagram
74
Section 4 Wireless Subwoofer Part
76
One Point Repair Guide
77
Power on Error
77
Wireless Connection
79
Waveforms of Major Check Point
80
Crystal
80
Flash Memory
80
Voltage
81
Amp Voltage
82
Pwm
83
Led
84
Wiring Diagram
86
Block Diagram
87
Circuit Diagrams
88
Woofer Smps & Amp - Smps Circuit Diagram
88
Woofer Smps & Amp - Amp Circuit Diagram
89
Circuit Voltage Chart
90
Printed Circuit Board Diagrams
91
Woofer Smps & Amp P. C. Board
91
4
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LG SPH7B-W Specifications
General
Brand
LG
Model
SPH7B-W
Category
Speaker System
Language
English
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