LG 3854R4894A SMPS Schematic
3-18 3-19
BLOCK DIAGRAMS
1. POWER(SMPS) BLOCK DIAGRAM
BD101
!
TRAN
T101
S
NOISE FILTER
BLOCK
(C101,L102,
C102)
!
FUSE
RESISTOR
(FR101)
C103
+
SNUBBER
BLOCK
(D101,C105
C106,R104)
DRIVE & S/W BLOCK
(IC101, D102, R105,
C104, C108 , C109,
C107,ZD101 ,ZD102)
RECTIFIER &
SMOOTING BLOCK
(D110,C163,C123)
RECTIFIER &
SMOOTING BLOCK
(D111,C127)
RECTIFIER &
SMOOTING BLOCK
(D113,C132,R119)
RECTIFIER &
SMOOTING BLOCK
(D118,C129,
L125,C131)
14VA
3.3V
33V
5.3VA
BR BL
(BK)(W
H)
!
Y-CAP
0
C11
!
Y-CAP
C111
PHOTO COUPLER
(IC102)
!
ERROR
AMP
(IC103)
FEED-BACK
BLOCK
(R112,R113,
C133,R114,
R115.R116
R117)
M5V/5VT
3-30 3-31
A
1
2
3
4
5
6
7
8
9
10
11
12
B C D E F G H I J K L M N O P Q R ST
NOTES) Symbol denotes AC ground.
NOTES) Symbol denotes DC chassis ground.
NOTE) Warning
NOTE) Parts that are shaded are critical
NOTE) With respect to risk of fire or
NOTE) electricial shock.
CIRCUIT DIAGRAMS
1. POWER(SMPS) CIRCUIT DIAGRAM 1
IMPORTANT SAFETY NOTICE
WHEN SERVICING THIS CHASSIS, UNDER NO CIRÂCUMSTANCES SHOULD THE ORIGINAL DESIGN BE
MODIFIED OR ALTERED WITHOUT PERMISSION
FROM THE JVC 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.
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