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CIRCUIT DIAGRAMS
1. POWER(SMPS) CIRCUIT DIAGRAM
IMPORTANT SAFETY NOTICE
WHEN SERVICING THIS CHASSIS, UNDER NO CIRÂCUMSTANCES 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 DIFÂFER 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
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3. RF & SERVO CIRCUIT DIAGRAM
CD/DVD LD
will not on
'02. 12. 26 R14601A
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4. TIMER, 5.1CH, SCART, KARAOKE CIRCUIT DIAGRAM
(OPTIONAL PART)
(OPTIONAL PART)
(OPTIONAL PART)
Karaoke not operate.
Digital abnormal
5.1CH Audio Bad
System not operate or
Digitron abnormal or
Key not operate.
Power LED abnormal
System not operate
Remocon not operate
'02. 12. 26 R14603A
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5. AV/JACK CIRCUIT DIAGRAM
Video Signal Y
Video Signal Color
Video Signal CVBS
2CH Audio
2CH Audio out bad.
All Video signal isn't
appear or bad
SACD OPTION
2CH Audio out bad.
2.5V doesn't appeat
System not working
'02. 12. 26 R14602A
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