LG DR7400, Руководство по обслуживанию

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3-14 3-15
CIRCUIT DIAGRAMS
1. POWER CIRCUIT DIAGRAM
A B C D E F G H I J K L M N O P Q R S T
Power dead
BD101, R101 are defective
Power dead
F101 is defective
NOTES : Symbol denotes AC ground.
Symbol denotes DC chassis ground.
12V Power dead
D127, IC152, IC157 are defective
12V Power dead
D123, IC153, IC156 are defective
3.3V or 2.5V Power dead
D124, Q162, IC154 are defective
33V Power dead
D126, ZD126, Q161 are defective
Switching dead
IC101 is defective
IMPORTANT SAFETY NOTICE
WHEN SERVICING THIS CHASSIS, UNDER NO CIR-
CUMSTANCES SHOULD THE ORIGINAL DESIGN BE
MODIFIED OR ALTERED WITHOUT PERMISSION
FROM THE LG ELECTRONICS CORPORATION. ALL
COMPONENTS SHOULD BE REPLACED ONLY WITH
TYPES IDENTICAL TO THOSE IN THE ORIGINAL CIR-
CUIT. SPECIAL COMPONENTS ARE SHADED ON THE
SCHEMATIC FOR EASY IDENTIFICATION.
THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIF-
FER FROM THE ACTUAL CIRCUIT USED. THIS WAY,
IMPLEMENTATION OF THE LATEST SAFETY AND
PERFORMANCE IMPROVEMENT CHANGES INTO
THE SET IS NOT DELAYED UNTIL THE NEW SERVICE
LITERATURE IS PRINTED.
NOTE :
1. Shaded( ) parts are critical for safety. Replace only
with specified part number.
2. Voltages are DC-measured with a digital voltmeter
during Play mode.