Power Board - Norcent LT3290 Service Manual

32'' LCD TV

9.2 Power Board

This IC uses a CMOS device with high dielectric
strength (30V) to implement low power
consumption.
VCC2
FA5500A: 11.5V ON / 9V OFF
FA5501A:13V ON / 9V OFF
Q924
PMBS3906
D925 C987 R122 C988
0.8A/200V SOD-123 4.7K 1/10W 0.1uF
0.1uF/50V/1206
R121
D901
68K 1/8W 1N5406
L911
L904
PFC CHOKE PQ3225
C974 D902
! YG972S6R
0.01UF/1KV
C929
0.01UF/1KV
C911
1uF/450V
!
R903
R907
620K 1/8W 68K 1/10W
L903
!
120UH
R904
620K 1/8W
C910 +
1uF/450V R905 C913
0 1/8W C914 22uF/50V
!
0.1uF FA5500AN
2 3
BD901
! D10XB60
R906 C915
10K 1/10W 1% 0.01uF
C916
220pF
D111 VCC2
2 3
!
L911 R111 R112
BA159G 4.7M 1/8W 4.7M 1/8W
1 4
C111
0.01UF/1KV
C908
0.22uF/250V
!
C902 C905
1000PF/250V 1000PF/250V
! !
C912
1uF/450V
2 3
VCC1
!
L902
1 4
C909
0.22uF/250V
!
C903 C904
1000PF/250V 1000PF/250V
IC903
! ! STR-A6252
2 3
L901
1 4
C953
R900 R902 R969 0.22uF/25V
390K 1/8W 390K 1/8W 0.82 2W C954
4700PF/25V
!
! !
R901 390K 1/8W
RV901
Varistor
!
NR901
! F901 !
5A/3
5A/250V
!
R973
100K 1/10W
CN901
3P/3.96mm
R974
16K 1/10W
AC INLET 1
AC INLET 2 AC INLET 3 AC INLET 4
AC INLET
WIRE GREEN WIRE L/N TUBE
N.C R920 100 1/8W
2 3
10K 1/8W 240 1/8W
+
R123 R921 R922
10K 1/10W C920
22uF/50V NCP1377
1 Q910
13.8 ON
J916
PMBS3904
20V籹祘
VCC3
1 Q925
ZD901 0 1/6W
PMBS3904
RLZ15B
Demag The auxiliary FLYBACK signal
ensures discontinuous operation and
B+
offers a fixed
overvoltage detection level of 7.2
V.
+
!
C921 C985
C907
0.01UF/1KV 0.01UF/1KV
MXY 180uF/450V 25*40
R915
330K 1/8W
R908 D903
0 1/10W LL4148WP
!
C923 shift vally翴
R909
22 1/10W Q901 Demg筿瑈禬筁3mA穦玂臔
R949
STP20NM60FP 20K 1/10W C923
R910 82PF
IC902
20K 1/10W R916 VCC3
330K 1/8W 1 8
Demag HV
2 7
FB N.C
R911 3 6
CS Vcc
470 1/10W
C926 4 5
GND Drv
IC901 R912 R917 470PF
0.15 3W 330K 1/8W
NCP1377 C924 +
C925
C918 0.1uF
1000PF/50V 47uF/50V
R918
18K 1/10W 1%
R914
10K 1/10W R919
10K 1/10W 1%
C927
470PF VCC Increasing Level at which the
C917
Current Source Turns.Off 6 VCCON
IC111
0.47uF/25V
1 4 11.6 12.5 13.7 V
OUT GND
2 3
VIN N.C
R113
4.7M 1/8W NCP305
C112
0.1uF
R114
330K 1/8W
R999
100 1/8W
R997
B+ 100 1/8W
!
T902 R998
EFD25/ Lp=?UH 100 1/8W L907
D920 C965 3.5UH
1 6
1000PF/1KV
R965 7
C950
100K 2W
1000PF/1KV
D916
FMW-2156
+ +
9 C957
BA159G D917 10 1000uF/16V C958
1000uF/16V
BA159G
3
D918 R970
UF4003 5R1 1/8W
4
C952 + C951 5
0.1uF 47uF/50V
R976
470 1/6W
VFB
R979
10K 1/6W
C963 R981
IC911 R977 0.1uF 10K
PC123FY2 4P
2K 1/10W
0 1/10W
!
R978
C962
0.1uF
R980 1K
R971 1/10W
IC922
1K 1/10W
KIA431
R983
D919 10K 1/10W 1%
+ C955 R982
LL4148WP
10uF/50V
200K 1/10W
R972 4.7K 1/10W
HS3
HS1
1
Q912 1 2
PMBS3906 2
HS7
1 H/S D920
H/S Q901 1
2
HS4
HS2
1 H/S BD901
1 2
1 Q913 2
PMBS3904
HS5 HS6
H/S D910
+ C956 C972 H/S Q902
10uF/50V
0.1uF 1 1
2 2
H/S D931 H/S IC903
!
C901
1000PF/250V
VCC
C900
1000PF/250V
FME-220B20A/150V
!
D931
T901
ER4224 Lp=?UH
8 16 +
1000uF/35V
15
7 14 FME-220B20A/150V
R925 D932
47K 3W 6
C922
D906 D907
0.0022uF/1KV BA159G BA159G 5 9
R926
3
C930 R940
10
20K 1/10W 13
! 12
R927 1 11 1000PF/1KV 47 /1W
10K 1/10W
D908
LL4148WP D910
R928
22 1/10W Q902
STP12NK80ZFP 20A/150V
C938 R939
!
C973 ZD910 R929
RLZ18B
0.1uF 20K 1/10W 1000PF/1KV 47 /1W
R935
20K 1/10W
R930
100 1/10W
R931 ZD911
RLZ2.2B
0.22 3W
R941
470 1/6W
R944
R942 10K 1/10W
2K 1/10W
5VS IC910
PC123FY2 4P
!
C944
0.1uF
F903 0 1/10W
C943
R943
6.5A/63V/1206 0.1uF
+ C960
C959 0.1uF
470uF/16V ZD906 IC921
KIA431
RLZ5.6B
D921
LL4148WP
Q907
AO4411
1 8
VCC1 S1 D1
2 7
VCC2 S1 D1
1/10W 1% R987 3 6
S1 D1
4 5
Q914
G1 D1
33K 1/10W
2 3
PMBS3906
N.C R966
R984 10K 1/10W
1K 1/10W
R985
R986 R991
ZD909
10K 1/10W 1K 1/10W 470
2 1
RLZ15B
IC912
PC123FY2 4P
SCR901
2N5060
!
DTC144WKA
Q916 Q915
R988
1 PMBS3904
1
1K 1/10W
C966 C964
0.1uF 0.1uF
R993
Q923 1
PMBS3904
1K
GND4 GND2
C968
GND1 GND3
0.1uF
1 1
1 1
GND GND
GND GND
49
24VS
24VIN 24V
L905
RJ901
1 2
C931 + C933 3.5UH + C935 8m
+ C932 470uF/35V
1000uF/35V
1000uF/35V
R950 R951 R952
1K 1/16W 1K 1/16W 1K
24V IC931 R953
5 1 1K 1/16W Q921
Vcc out
PMBS3904
R954
FP130 C970
56K 1/16W 0.1uF
51K==>5.7A
51K==>6.0A
SMD4148
DIP4148
56K==>5.0A
TVS901 D923
P6KE12A 56K==>5.4A 1N4148
12VIN
L906
RJ902 S_PROTECTION
1 2
12V
3.5UH 8m
!
‫ְך‬FUSE
+ C939 + C941
470uF/25V
1000uF/25V
AUDIO ON/OFF
!
F902 1
2
R30-250(30V/2.5A)
3
4
R989
JUMPER
12V
24VIN
22V
R990
12VIN
43K 1/10W 1%
ZD903
MTZJ27B(24.97~26.26V) ZD904 ZD905 R955
R946 MTZJ15B(13.89~14.62V) 1K 1/16W
15K 1/10W 1% MTZJ24B(22.61~23.77V)
R945
D913 D914 D915 IC932
LL4148WP LL4148WP LL4148WP 5
Vcc out
0 1/10W
R947
1.5K 1/10W 1%
FP130
S_PROTECTION
J938 jumper
5V
R104 10K
1/10W L101
24VS audio power
45UH
IC101
1 2
VIN SWout
C961
SI-8120 R101
0.1uF
4 1.5K 1/10W
VOS
D933 R102
LL4148WP Q101 1.5K 1/10W
PMBS3904 D101
S_PROTECTION
C101
1 R103 SR54
0.1uF
1K 1/8W
1/8W
R994
1.5K 1/10W
Q102
R105 1K
PMBS3904 1/10W
1 AUDIO
2
PS
CN924
1
PS
2
3
C967 R995 4
1uF 1K 1/10W 5
5V
1/10W 6
7
8
Title
R992 9
5VS
470 1/8W
Size Document Number
Custom
9P/2.0mm
Date:
Norcent LT3290
FOR BACKLIGHT
24V/4.5A
CN921
1
2
3
4
C936 5
0.1uF 6
7
8
9
10
11
12
13
1/16W 14
14P/2.0mm
CN922
1
2
3
4
5
6
7
8
9
10
10P/2.0mm
CN923
1
2
3
4
5
6
7
8
9
CN925
10
11
12
C969
12P/2.0mm
0.1uF
4P/2.0mm 12V
12V
R956
1K 1/16W R957
1K 1/16W
R958
1 1K 1/16W Q922
PMBS3904
R959
120K 1/16W C971
0.1uF
120K==>2.7A
D924
1N4148
150K==>2.2A
S_PROTECTION
22V
FB101
BEAD
+ C102 C103
1000uF/35V 0.1uF
Rev
A
Sheet 1 of 2