LG 3854R14370A PSU Schematic

3-20 3-21

BLOCK DIAGRAMS

1. POWER(SMPS) BLOCK DIAGRAM

BD101

R101

!

TRANS

T101

NOISE FILTER

BLOCK

(C101,L102,

C102)

!

FUSE

(F101)

!

!

BR BL
(BK)(WH)

!

Y-CAP

C110

C103

!

Y-CAP

+

C111

SNUBBER

BLOCK
(D101,C105
C106,R104)

657 8

DRIVE & S/W BLOCK

(IC101, D102, R105,

C104, C109 , C135)

31

2

PHOTO COUPLER

(IC102)

!

ERROR

< HSR OPTION>

RECTIFIER &

SMOOTING BLOCK

(D106,C117,R130)

RECTIFIER &

SMOOTING BLOCK

(D110,C123,C163,

R133,L122,C126)

RECTIFIER &

SMOOTING BLOCK

(D118,D112,C129,

C131,L124,L125)

RECTIFIER &

SMOOTING BLOCK

(D111,C127,L123,

C128)

RECTIFIER &

SMOOTING BLOCK

(D113,C132,R119)

AMP

(IC103)

FEED-BACK

BLOCK
R112,R113,
C133,R114.

R115.R116

R117)

< HSR OPTION>
24V S/W BLOCK

(Q153,R151,R152,

°‹

D122,Q154,R110,
D116,R181,R182)

12V REG BLOCK

(Q156,ZD103,C151,

R150,R153,C152)

R157,R158,R159,R160

Q162,R164,R172,C161)

3.3V REG BLOCK

(IC152,C153,R156)

33VT S/W BLOCK
(Q161,R154,R155

Q173,R174,R177)

5VT S/W BLOCK

(Q163,C162,R173,

R176,R175,Q164)

8V REG BLOCK

(D114,IC151,R170,

5V S/W BLOCK

(Q150,C155,D121,

C154)

D117

D115

D111

CAP VCC
13VA/24V

HSR’H’

DRUM VCC

13VA

12VT

5.3VA

5.0V

PWR CTL’H’

3.3V

2.5V

33VT

5.0VT

TIMER’H’

8V

COMBI TOSHIBA

VBC8007P1M's

3-32 3-33

2. POWER(SMPS) CIRCUIT DIAGRAM 2