Circuit Diagrams; Woofer Smps Circuit Diagram - LG LAS551H Service Manual

CIRCUIT DIAGRAMS

1. WOOFER SMPS CIRCUIT DIAGRAM

No Power
12
BD901 is Defective
11
10
9
8
7
6
5
4
Switching Error
IC901 is Defective
3
No Power
F901 is Defective
2
1
A B C D
No Power
D901 is Defective
No Power
Q901 is Defective
No Power
Q920 is Defective
Warning
Parts that are shaded are critical with
respect to risk of fire or electrical shock.
E F G H I
4-15
IMPORTANT SAFETY
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
No Power
D951 is Defective
Switching Error
PC901 is Defective
Switching Error
IC951 is Defective
J K L M N
4-16
NOTE :
ON THE SCHEMATIC FOR EASY IDENTIFICATION. 1. Shaded( ) parts are critical for safety. Replace only
THIS CIRCUIT DIAGRAM MAY OCCASIONALLY with specified part number.
DIFFER FROM THE ACTUAL CIRCUIT USED. THIS 2. Voltages are DC-measured with a digital voltmeter
WAY, IMPLEMENTATION OF THE LATEST SAFETY during Play mode.
AND PERFORMANCE IMPROVEMENT CHANGES
INTO THE SET IS NOT DELAYED UNTIL THE NEW
SERVICE LITERATURE IS PRINTED.
Switching Error
Q951 is Defective
O P Q R
WF-SMPS
EAX66172301 Rev1.2(10)
2014.11.26
S T