3-26
3-27
CIRCUIT DIAGRAMS
1. POWER(SMPS) CIRCUIT DIAGRAM
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.
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
14VA No Power
D125 is Defective
12V No Power
Q123 is Defective
5.0V No Power
Q126 is Defective
5.6V No Power
Q125 is Defective
3.3V No Power
Q121 is Defective
3.3VA No Power
D121 or D122 are Defective
Switching Error
IC102,IC103 are Defective
Switching Error
IC101is Defective
No Power
FR101 is Defective
No Power
D105~D108 is Defective
5.6VA No Power
D123 is Defective
Summary of Contents for DV140
Page 25: ...3 15 FIG 7 2 DVD FIG 7 3 CD F F FE FE RFL RFL...
Page 26: ...3 16 FIG 7 4 CD 8 FOCUS ON WAVEFORM FIG 8 1 DVD FE FOSO F F F FE RFL...
Page 30: ...3 20 2 COMPOSITE VIDEO SIGNAL FIG 13 2 13 AUDIO OUTPUT FROM AUDIO DAC FIG 13 1...
Page 37: ...3 28 3 29 2 AV JACK CIRCUIT DIAGRAM A B C D E F G H I J K L M N O P Q R S T...
Page 38: ...3 30 3 31 A B C D E F G H I J K L M N O P Q R S T 3 SYSTEM CIRCUIT DIAGRAM...
Page 40: ...3 34 3 35 5 TIMER CIRCUIT DIAGRAM A B C D E F G H I J K L M N O P Q R S T...
Page 42: ...3 38 3 39 PRINTED CIRCUIT DIAGRAMS 1 MAIN P C BOARD LOCATION GUIDE...
Page 44: ...3 42 3 43 4 SMPS P C BOARD 360mm ONLY LOCATION GUIDE 430mm ONLY...
Page 45: ......
