LG SL8YG Service Manual page 39

NO SOUND
2-4. USB
2-4-1. Solution
Replace MAIN board.
2-4-2. How to troubleshoot (Countermeasure)
1) Please check soldering status of USB_5 V at JK200 pin1.
2) If soldering status and USB_5 V are abnormal, replace MAIN board.
2-4-3. Service hint (Any picture / Remark)
Normal USB for Playback
JK200
VCC
USB_DN
USB_DP
GND
G201
SMR-TS-4.5-6-4
2018.12.07
G201 ADD
ESD & EMI
X 8 0 0
C 8 0 0 C 8 0 4
C 2 7 9
D 2 1 2
R 2 H 1
R 8 2 9
I C 8 0 0
ONE POINT REPAIR GUIDE
USB_5V
 
TP269
1
TP270
2
TP271
3
TP272
4
DGND
C 2 8 7
D 2 0 7
A R 8 1 3
A R 8 1 2
A R 8 1 1
A R 8 1 0
R 8 6 7
R 8 3 6
R 8 3 7
R 8 3 5
I N T
R 8 4 2
R 8 4 3
< MAIN board top view >
NC
FL209
1
R278 4.7 2
R274 4.7 4
3
C2A1
NC
10pF
JK200 JK200
C 2 A 1 C 2 A 2
 
F B 2 1 5
C 2 1 4
C 2 2 2 R 2 3 7
C 2 2 0 R 2 3 6
C 2 0 7
C 2 1 9 R 2 3 5
C 2 0 5
C 2 1 6 R 2 3 4
L 8 0 1
I C 2 0 1
F B 8 1 5
C 2 1 5
R 2 3 1
R 2 3 8 R 2 3 2
C 2 1 8
L 3 0 3
3-12
Copyright © 2019 LG Electronics Inc. All rights reserved.
USB0_DN
USB0_DP
C2A2
NC
10pF
F L 2 1 0
C N 2 0 9
Z D 2 0 1
C 2 H 6
R 3 6 0
R 2 2 2
C 3 9 8
X 2 0 1
R 2 2 1
R 2 2 0
C 3 B 6
R 2 1 9
C 3 7 5
R 2 2 3
C 3 7 6
F B 3 1 5
C 2 P 2
Only for training and service purposes.
R 5 F
R 5 M
R 3
R 3
R
R
R 3
C 3
C 3 0 4
R 3 3 6
C 3 4 4
C 3 4 9