LG SL7Y Service Manual page 36

NO SOUND
2-4. USB
2-4-1. Solution
Replace MPEG/JACK board.
2-4-2. How to troubleshoot (Countermeasure)
1) Please check USB_5V at JK204 pin1.
2) If soldering status and voltage has abnormal status, replace MPEG/JACK board.
2-4-3. Service hint (Any picture / Remark)
USB Playback
EAG62571101
JK204
5V
USB D-
USB D+
DGND
C 8 0 4
0 1
F L 8 0 2 F L 8 0 1
R 8 0 1
R 8 0 0
C 8 0 2
M P E G / J A C K
X 6 8 2 9 3 4 0 1 V e r 1 . 2 - F R 4 - 4 L 1 . 6 T
B S I Z E : 2 0 7 . 5 X 6 6 . 5
8 . 1 1 . 2 2
ONE POINT REPAIR GUIDE
USB_5V
PZ1608U221-1R4TF
D201
NC
uCLAMP0561P
C214
TP244
1
100nF
TP245
2
TP246
3
TP247
4
DGND
C N 8 0 0
F L 8 0 4
F L 8 0 3
C 8 2 3
< MPEG/JACK board top view >
VCC_5V
FB315
NC
C216
220uF
FL203
R235
4.7
2
1
3
R236
4.7
4
J K 2 0 1
R 8 1 0
R 8 1 1 C 2 2 8
C 2 6 6
R 2 0 5
F B 3 1 5
C 2 1 6
I C 3 0 9
1
3-11
Copyright © 2019 LG Electronics Inc. All rights reserved.
USB2_DN
MPEG
USB2_DP
JK204 JK204
J K 2 0 4
USB_5V USB_5V
R 2 3 6
F L 2 0 3
R 2 3 5
Only for training and service purposes.