Circuit Diagrams; Smps Circuit Diagram - LG BD370 Service Manual

CIRCUIT DIAGRAMS

1. SMPS CIRCUIT DIAGRAM

No Power
BD101,R101 is Defective
S/W Error
IC101,IC104 is Defective
No Power
F101 is Defective
A B C D
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
No Power
D102 is Defective
Switching Error
IC102,IC103 are Defective
E F G H I
3-57
IMPORTANT SAFETY
WHEN SERVICING THIS CHASSIS, UNDER NO
CIRCUMSTANCES SHOULD THE
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
VFD No Power
D126 is Defective
13VA No Power
D122 is Defective
5V NoPower
IC152 are Defective
5.3VA No Power
D124 is Defective
12VA No Power
D121 is Defective
3.3VA No Power
D123 is Defective
3.3V NoPower
IC153 are Defective
J K L M
3-58
NOTE :
ON THE SCHEMATIC FOR EASY IDENTIFICATION. 1. Shaded( ) parts are critical for safety. Replace only
ORIGINAL 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.
12V NoPower
IC154 are Defective
12V NoPower
IC151 are Defective
N O P Q R S T
LGE Internal Use Only