Circuit Diagrams; Smps Circuit Diagram - LG LAB550H Service Manual

CIRCUIT DIAGRAMS

1. SMPS CIRCUIT DIAGRAM

12
No Power
BD900 is Defective
11
10
9
8
7
6
5
4
3
2
1
A B C D
No Power
D900 is Defective
No Power
Q901 is Defective
Switching Error
IC901 is Defective
No Power
F900 is Defective
Warning
Parts that are shaded are critical with
respect to risk of fire or electrical shock.
E F G H I
2-59
IMPORTANT SAFETY NOTICE
WHEN SERVICING THIS CHASSIS, UNDER NO
CIRCUMSTANCES SHOULD THE ORIGINAL DESIGN
BE MODIFIED OR ALTERED WITH OUT PERMISSION
FROM THE LG CORPORATION. ALL COMPONENTS
SHOULD BE REPLACED ONLY WITH TYPES
IDENTICAL TO THOSE IN THE ORIGINAL CIRCUIT.
Switching Error
PC900 is Defective
J K L M N
2-60
SPECIAL COMPONENTS ARE SHADED ON THE NOTE :
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.
No Power
D991 is Defective
Switching Error
IC950 is Defective
O P Q R
SMPS
EAX66205101 Rev1.8(17)
2014.12.23
S T