LG S75A1-D User Manual

4-164-15
A
1
2
3
4
5
6
7
8
9
10
11
12
B C D E F G H I J K L M N O P Q R ST
WF-SMPS
EAX66172301_Rev1.2(13)
2015.05.26
Warning
Parts that are shaded are critical with
respect to risk of fire or electrical shock.
No Power
BD901 is Defective
No Power
D901 is Defective
No Power
Q901 is Defective
No Power
Q920 is Defective
No Power
D951 is Defective
No Power
F901 is Defective
Switching Error
IC901 is Defective
Switching Error
PC901 is Defective
Switching Error
IC951 is Defective
Switching Error
Q951 is Defective
CIRCUIT DIAGRAMS
1. WOOFER SMPS CIRCUIT DIAGRAM
WHEN SERVICING THIS CHASSIS, UNDER NO
CIRCUMSTANCES SHOULD THE ORIGINAL
DESIGN BE MODIFIED OR ALTERED WITHOUT
PERMISSION FROM THE LG CORPORATION. ALL
COMPONENTS SHOULD BE REPLACED ONLY WITH
TYPES IDENTICAL TO THOSE IN THE ORIGINAL
CIRCUIT. SPECIAL COMPONENTS ARE SHADED
ON THE SCHEMATIC FOR EASY IDENTIFICATION.
THIS CIRCUIT DIAGRAM MAY OCCASIONALLY
DIFFER FROM THE ACTUAL CIRCUIT USED. THIS
WAY, IMPLEMENTATION OF THE LATEST SAFETY
AND PERFORMANCE IMPROVEMENT CHANGES
INTO THE SET IS NOT DELAYED UNTIL THE NEW
SERVICE LITERATURE IS PRINTED.
1. Shaded( ) parts are critical for safety. Replace only
with specified part number.
2. Voltages are DC-measured with a digital voltmeter
during Play mode.
IMPORTANT SAFETY NOTE :

LG S75A1-D Specifications

General

Brand	LG
Model	S75A1-D
Category	Speakers
Language	English