LG SJ4Y Service Manual

3-13
Copyright © 2017 - 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+/-, TWL+/- (CN703 pin1, 2, 3, 4)
and FR+/-, TWR+/- (CN704 pin1, 2, 4, 5).
2) Check resistor crack, cold solder of PWM IC out (AR601, AR602)
3) If PWM IC out is ok and speaker out (FL+/-, FR+/-, TWL+/-, TWR+/-) has DC voltage,
replace MAIN board.
3-1-3. Service hint (Any picture / Remark)
< MAIN board top view >
IC600
IC600
CN703
CN703
CN704
CN704
AR601
AR601
AR602
AR602

LG SJ4Y Specifications

General

Audio decoders	Dolby Digital
RMS rated power	300 W
Audio output channels	2.1 channels
Audio Return Channel (ARC)	Yes
Soundbar speaker RMS power	120 W
Subwoofer type	Active subwoofer
Receiver included	No
Power consumption (standby)	0.5 W
Power consumption (typical)	20 W
HDMI in	1
HDMI version	1.4
Bluetooth version	4.0
Number of HDMI outputs	-
USB 2.0 ports quantity	USB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
Connectivity technology	Wired & Wireless
Digital audio coaxial in	0
Apple docking compatibility	Not supported
Product color	Black
Consumer Electronics Control (CEC)	SimpLink

Weight and Dimensions

Depth	86.3 mm
Width	889 mm
Height	56 mm
Subwoofer depth	252 mm
Subwoofer width	171 mm
Subwoofer height	320 mm
Subwoofer weight	4200 g