Circuit Diagrams; Power (Smps) Circuit Diagram - LG RCT689H Service Manual

CIRCUIT DIAGRAMS

1. POWER (SMPS) CIRCUIT DIAGRAM

No Power
BD101,R101 are Defective
S/W Error
IC101,IC104 are Defective
No Power
F101 is Defective
A B C D
33V No Power
D126 is Defective
No Power
D102 is Defective
13VA No Power
D124 is Defective
Switching Error
IC102,IC103 are Defective
E F G H I
3-35
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 ON THE
5.3VA No Power
D123 is Defective
13VA No Power
D122 is Defective
3.3V No Power
IC153 is Defective
3.8VA No Power
D127 is Defective
5.5VA No Power
D128 is Defective
12V No Power
IC155 is Defective
J K L M N
3-36
NOTE :
SCHEMATIC FOR EASY IDENTIFICATION. THIS 1. Shaded( ) parts are critical for safety. Replace only
CIRCUIT DIAGRAM MAY OCCASIONALLY DIFFER with specified part number.
FROM THE ACTUAL CIRCUIT USED. THIS WAY, 2. Voltages are DC-measured with a digital voltmeter
IMPLEMENTATION OF THE LATEST SAFETY AND during Play mode.
PERFORMANCE IMPROVEMENT CHANGES INTO
THE SET IS NOT DELAYED UNTIL THE NEW SERVICE
LITERATURE IS PRINTED.
2.5V NoPower
IC154,D156 are Defective
5V No Power
IC156 is Defective
O P Q R S T