JVC LT-42HB1BU Service Manual page 26

MAIN PWB CIRCUIT DIAGRAM (4/46) [Power Regulation]
1
NORMAL POWER
+5V
TP17
PCB_TP10
C71
C69 R42
106p/10V/2012
106p/10V/2012 104/1005
A
U31
7
EN
C77
104p/16V/1005
8
SS
4
GND
C76
MP2307
OPEN-106p/10V/2012
TP32
PCB_TP10
+5V
C41
106p/10V/2012
R48
104/1005
B
C42
C48
106p/10V/2012
104p/16V/1005
R49
104/1005
TP34
PCB_TP10
+3V3
C53
104p/16V/1005
U33
+5V
RT9018B25PSP
3
C52
2
R33
106p/10V/2012
104/1005
4
8
C
C59
105p/25V 9
C58
Max.3A
OPEN-105p/16V/1005
TP36
PCB_TP10
+5V
C65
C63
C64
OPEN-105p/16V/1005
106p/10V/2012
D 104p/16V/1005
All location are from 30 to 80
1
2
Vout = 0.925 x (1+R1/R2)
R52
C70 L31
750/F/1005
103p/50V/1005 4.7uH/SPC7040-4R7/3.5A
D30
OPEN-B340A
R1
3
SW
1 2
5 R51
FB
C75 D31
OPEN-104/1005
OPEN-LL4148
6
COMP
822p/25V/1005
C78
OPEN-561p/1005 R45 R2
4021/F/1005
MAX: 3A
U32
MP2121DQ C43
R39 103p/50V/1005
000/1005
L32
4 5
IN BS
SPC6025-1R0M
7 3
IN SW
6 8
POK SW
R1
10 1
EN/SYNC FB
R31
304/F/1005
C50
335p/10V/2012
R32
R2
6043/F/1005
Vout=0.8V(R1+R2)/R2
TP35
+1V8
PCB_TP10
[Douglas DDR]
+1.816V,
6
VIN VOUT
Max.781mA
R34
R1
EN 753/F/1005
C54 C55
104p/16V/1005
106p/10V/2012
7
VDD ADJ
5
R37
GND NC R36
R2
104/1005
593/F/1005
1
TAP PGOOD
Vout=0.8V(R1+R2)/R2
MAX 1.5A
U34
LD29150PT/P-PAK 5P
TP37
PCB_TP10
+3V3_D
+3.3V
MAX 642mA
R40
1692/F/1005
C31 C67
C68
104p/16V/1005 106p/10V/2012
104p/16V/1005
R41
103/F/1005
2
(No.YA707<Rev.001>)2-15
3 4
TP31
PCB_TP10
+3.366V, Max.1.3A
+3V3
R43
243/F/1005
C72 C73
C74
226p/6.3V/2012 226p/6.3V/2012
220uF/16V/MVK/S
R44
912/F/1005
AC_DETECT
MAIN PWB
(3/46),(5/46),(22/46),(43/46)
[Douglas Core]
TP33
+1.216V,
PCB_TP10
+1V2
Max.1634mA
C62
C44
100uF/25V/BXE/S
104p/16V/1005
C61
226p/6.3V/2012
3 4
2-16(No.YA707<Rev.001>)
5
STAND-BY POWER
+5V4STB
TP38
PCB_TP10
C30
105p/25V R50
104/1005
+5V4STB
U36
OPEN-ASM811REUSF-T
4 1
VCC GND
R46
OPEN-103/1005
3 2
MR RESET
C66 C92
R47
OPEN-102p/50V/1005 OPEN-104p/16V/1005 OPEN-104/1005
3V3 Power Branch
+3V3 +3V3_A
L33 C45
BLM18PG300SN1D
C46
C47
104p/16V/1005
+3V3H
+3V3_D
L34 C49
BLM18PG300SN1D
C51
1V8 Power Branch
+1V8
VDDR_MEM
C57
100uF/25V/BXE/S
L35
BLM18PG300SN1D
C56
104p/16V/1005
MAIN PWB ASS'Y(4/46)
GND_D DGND GND_A
[Power Regulation]
HU-71100006
5
6
TP39
+5VSTB
PCB_TP10
U35 RT9167-50PB
MAX 29mA
1 5
VIN VOUT
A
3
EN
C80
2 4
GND BP
C34
105p/25V
104p/16V/1005
C79
103p/50V/1005
B
104p/16V/1005
220uF/16V/MVK/S
104p/16V/1005
220uF/16V/MVK/S
C
DDR_VRF
R35
102/F/1005
C60
R38
102/F/1005 104p/16V/1005
D
6
hb1_main_0612_2/48_0.0