LG SPH2B-P Service Manual

3-3
ONE POINT REPAIR GUIDE
2. SPEAKER NO SOUND
No Sound when you TURN ON the unit.
2-1. Digital AMP (IC701, IC702)
2-1-1. Solution
Replace IC701, IC702 on MAIN board.
2-1-2. How to troubleshoot (Countermeasure)
1) Please check 3.3 V of IC701, IC702 pin13.
If 3.3 V voltage doesn’t come out, Replace IC602.
2) Please check 15 V of IC701, IC702 pin2, 3, 34, 35.
If 15.0 V voltage doesn’t come out, Replace SMPS Circuit.
3) Please check 3.3 V of IC701, IC702 pin14, 19, 25.
If 3.3 V voltage doesn’t come out, check IC101 pin B3, D8, D9.
4) Please check I2S signal of IC701, IC702 pin15, 20, 21, 22 and Replace it.
2-1-3. Service hint (Any picture / Remark)
< MAIN board bottom view >
< Schematic point >
R717
C712
R703
R720
R719
C711
C704
R716
C706
C707 C714 C715 C728
C735
C708
C709
R718
R713
R704
C702
R715
R714
R706
R705
C705
R702
R701
C701
NO VIA, CLO
S
C734
C731
C733
C732
TAS5733
IC701
FB702
R722
C713 C723 C729
R735
C752
R721
R729
R707
R723
C710
C741
C716 C717 C719
C754
C730
R734
R731
R733
C765
R732
C764
FB703
C753
R737
C763
R724
R736
R708
R730
C742
TAS5733
IC702
C760
C703
IC701
IC701
IC702
IC702

LG SPH2B-P Specifications

General

Brand	LG
Model	SPH2B-P
Category	Speaker System
Language	English