LG 3854R4894A SMPS Schematic

BLOCK DIAGRAMS

1. POWER(SMPS) BLOCK DIAGRAM

!

T101

BD101

TRANS

+

SNUBBER

RECTIFIER &

C103

BLOCK

SMOOTING BLOCK

(D101,C105

(D110,C163,C123)

C106,R104)

DRIVE & S/W BLOCK

NOISE FILTER

(IC101, D102, R105,

C104, C108 , C109,

BLOCK

C107,ZD101 ,ZD102)

(C101,L102,

C102)

RECTIFIER &

!

SMOOTING BLOCK

(D111,C127)

FUSE

RESISTOR

RECTIFIER &

(FR101)

SMOOTING BLOCK

(D113,C132,R119)

RECTIFIER &

SMOOTING BLOCK

(D118,C129,

!

L125,C131)

PHOTO COUPLER

FEED-BACK

Y-CAP

BLOCK

(IC102)

C110

!

(R112,R113,

!

C133,R114,

Y-CAP

R115.R116

BR BL

C111

ERROR

R117)

(BK)(WH)

AMP

(IC103)

14VA

3.3V

33V

5.3VA

M5V/5VT

3-18

3-19

CIRCUIT DIAGRAMS

1. POWER(SMPS) CIRCUIT DIAGRAM 1

12

11

10

9

8

7

6

5

4

3

2

1

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.

IMPORTANT SAFETY NOTICE

WHEN SERVICING THIS CHASSIS, UNDER NO CIRCUMSTANCES 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 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.

NOTE :	are critical for safety. Replace only
1. Shaded(
with specified part number.
2. Voltages	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

3-30

3-31