LG S35A1-W Service Manual

3-6
ONE POINT REPAIR GUIDE
5. NO SOUND (OPTICAL)
5-1. Solution
Replace IC401 on MAIN board.
5-2. How to troubleshoot (Countermeasure)
1) Please check 3.3 V of 3.3 VA at L505 in USB board
If you can check 3.3 V, please confirm OPT_DET signal (R428) in MAIN board when optical mode.
2) In spite of process 1), set has abnormal output, then replace IC401.
5-3. Service hint (Any picture / Remark)
< USB board bottom view >
< MAIN board top view >
P_R
P_L
P_DET
P_GND
SPDIF
GND
5V
D+
D-
GND
1
OUT
2
GND
3
VCC
JK502
L505
600RH
C506
100NF
L504
600RH
L503
600RH
L502
600RH
L501
600RH
L506
0R
L507
0R
L508
600RH
C501
100PF
C502
100PF
C503
100PF
C505
10PF
R
L
123
4
5
6
7
8
9
JK504
1
2
3
4
5
6
7
8
9
10
CON502
R503
0R
R504
0R
R317
0R
R316
NC
1 2
3
D503
KDS226
C316
10NF
R318
100R
C317
100PF
C504
100R
L505
L505
R428
R428
IC401
IC401

LG S35A1-W Specifications

General

Brand	LG
Model	S35A1-W
Category	Speaker System
Language	English