LG DV5921N Schematic

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CIRCUIT DIAGRAMS

1. POWER(SMPS) CIRCUIT DIAGRAM

IMPORTANT SAFETY NOTICE

WHEN SERVICING THIS CHASSIS, UNDER NO CIR­CUMSTANCES 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 DIF­FER FROM THE ACTUAL CIRCUIT USED. THIS WAY,
IMPLEMENTATION OF THE LATEST SAFETY AND
PERFORMANCE IMPROVEMENT CHANGES INTO
THE SET IS NOT DELAYED UNTILTHE 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.

VF(+) Power Dead.
F102 is defective.

VF(-) Power Dead.
ZD101 is defective.

12V Power Dead.
IC103 is defective.

Power Dead.
IC101 is defective.

8V Power Dead.
IC105 is defective.

3.3V Power Dead.
IC106 is defective.

5V Power Dead.
Q107 is defective.

NOTES) Warning

NOTES) Parts that are shaded are critical
NOTES) With respect to risk of fire or
NOTES) electricial shock.

'02. 12. 26 R16006A

NOTES : Symbol denotes AC ground.

Symbol denotes DC chassis ground.

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No Power on

Video signal not
appeared

Video signal Y

Video signal Color

Digitron all not display
System not working

System not working or
screen is abnormal

System not working or
Digitron not display

Program download fail

System not operate

'02. 12. 26 R14600A

AUDIO DAC
interface

VIDEO
interface

RF & MOTOR DRIVE
interface

2. SYSTEM CIRCUIT DIAGRAM