LG SL4Y Service Manual

3-12
Copyright © 2019 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
ONE POINT REPAIR GUIDE
3. PROTECTION ERROR
No display or No Sound.
3-1. D(DC) PROTECTION
3-1-1. Solution
Replace MAIN board.
3-1-2. How to troubleshoot (Countermeasure)
1) Check DC Voltage of speaker out FL+/- (CN703 pin1, 2), FR +/- (CN704 pin1, 2, 3)
2) Check resistor crack, cold solder of ESS IC out [FL+(R570), FL-(R571), FR+(R572), FR-(R573)].
3) If ESS (IC501) out is ok and speaker out (FL+/-, FR+/-) has DC voltage replace MAIN board.
3-1-3. Service hint (Any picture / Remark)
< MAIN board top view >
MES
2
R3A1
R3A2 R3A3
FR2+
R3A4 R3A5
FR2-
R3A6
R5A5
R7A1
FL2+
FL2-
R7C2
R7C3
C5A1
C5A2
F300
F301
C7C5
C7C6
Q300
Q301
ZD504
L302
KEY_G
L709
L710
FB303
JK300
FB313
FB507
RCF500
FB508
CN505
R528
CN703
R338
CN704
R339
C300
C301
C307
C503
C311
C312
C313
C315 C317
C320
C323
R365 R366
R380R381
C347
C348
R388
7
C548
C549
C355
C356
C744
C745
C746
C747
D300
C758
C759
R795
R796
R797
R798
C378
C379
D702
D703
C767
C768
IC302
IC309
C771
C772
C773
C774
C777
C390
C778
C779
C780
C783
C784
C785
C786
KEY_TP
R
L
SL4 / SL4Y / SL4F Main
EAX68408202 Ver1.1
FR4-4L 1.2T
2018.12.06 261X67.5
CN703
CN703
CN704
CN704

LG SL4Y Specifications

General

Color	black
Audio Channels	2.1
Subwoofer	included
Surround Sound	dolby digital
Number of Drivers	2
RMS Power	300 watts
Inputs	toslink optical, usb type a
Outputs	usb type a
HDMI Inputs	0
HDMI Outputs	0
USB Ports	1
Bluetooth	yes
Wireless Connectivity	bluetooth
Wireless Subwoofer Connectivity	yes
Optical Audio Inputs	1
Remote Control	yes

Weight and Dimensions

Depth	3.3 inches
Height	2.2 inches
Width	35 inches
Net Weight	5 pounds
Subwoofer Depth	10.3 inches
Subwoofer Height	15.4 inches
Subwoofer Width	6.7 inches
Subwoofer Weight	11.7 pounds