Circuit Diagrams; Power (Smps) Circuit Diagram - LG DK867 Service Manual

CIRCUIT DIAGRAMS

1. POWER (SMPS) CIRCUIT DIAGRAM

No Power
D105~D108 is Defective
No Power
FR101 is Defective
A B C D
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Switching Error
IC101is Defective
3.3VA No Power
D121 or D122 are Defective
Switching Error
IC102,IC103 are Defective
E F G H I
3-31
IMPORTANT SAFETY
WHEN SERVICING THIS CHASSIS, UNDER NO CIR-
CUMSTANCES SHOULD THE ORIGINAL DESIGN BE
MODIFIED OR ALTERED WITHOUT PERMISSION
FROM THE LG CORPORATION. ALL COMPONENTS
SHOULD BE REPLACED ONLY WITH TYPES IDENTI-
CAL TO THOSE IN THE ORIGINAL CIRCUIT. SPECIAL
COMPONENTS ARE SHADED ON THE SCHEMATIC
14VA No Power
D125 is Defective
5.6VA No Power
D123 is Defective
J K L M N
3-32
NOTE :
FOR EASY IDENTIFICATION. THIS CIRCUIT DIAGRAM 1. Shaded( ) parts are critical for safety. Replace only
MAY OCCASIONALLY DIFFER FROM THE ACTUAL with specified part number.
CIRCUIT USED. THIS WAY, IMPLEMENTATION OF THE 2. Voltages are DC-measured with a digital voltmeter dur-
LATEST SAFETY AND PERFORMANCE IMPROVE- ing Play mode.
MENT CHANGES INTO THE SET IS NOT DELAYED
UNTIL THE NEW SERVICE LITERATURE IS PRINTED.
12V No Power
Q123 is Defective
5.0V No Power
Q126 is Defective
3.3V No Power
Q121 is Defective
O P Q R S T
LGE Internal Use Only