LG EAX31797301, EBY31324601 Schematic

3-34 3-35

CIRCUIT DIAGRAMS

1. SMPS 1 CIRCUIT DIAGRAM

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

SCHEMATIC FOR EASY IDENTIFICATION. THIS
CIRCUIT DIAGRAM MAY OCCASIONALLY DIFFER
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.

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.

IMPORTANT SAFETY NOTE :

No Power
BD101, R101 is Defective

No Power
D102 is Defective

14VA No Power
D127 is Defective

12V No Power
IC131 is Defective

5.5VA No Power
D125 is Defective

3.7V No Power
D124 is Defective

5V No Power
IC132 is Defective

S/W Error
IC101, IC104 is Defective

No Power
F101 is Defective

33V No Power
Q161 is Defective

5.3VA No Power
D121 is Defective

Switching Error
IC102, IC103 are Defective

PCB : EAX31797301