Norcent Norcent LT2725, Service Manual, Page: 53 / 123

27’’ LCD TV Color Monitor Norcent LT2725
53
9.2 Power Board
C926
470PF
R951
1K 1/16W
R912
0.15 3W
R944
10K 1/10W
5VS
!
HS2
H/S Q902
1
2
R971
1K 1/10W
AUDIO
D913
LL4148WP
FP130
IC931
2
3 4
1 5
Vss
Vip Vin
out Vcc
VCC2
S_PROTECTION
!
IC901
FA5500AN
1 2 3 4
8 7 6 5
FB CO
M
P
MU
L
IS
VC
C
OU
T
GN
D
ZC
D
R957
1K 1/16W
24VS
R972 4.7K 1/10W
C911
1uF/450V
R102
1.5K 1/10W
PS
R983
10K 1/10W 1%
R914
10K 1/10W
AUDIO ON/OFF
C918
1000PF/50V
!
R900
390K 1/8W
C985
0.01UF/1KV
C972
0.1uF
C910
1uF/450V
C925
0.1uF
D918
UF4003
C904
1000PF/250V
AC INLET 4
TUBE
1 2 3
R988
1K 1/10W
!
R984
1K 1/10W
!
R123
10K 1/10W
R103
1K 1/8W
R990
43K 1/10W 1%
N.C R966
10K 1/10W
VCC2
!
R917
330K 1/8W
D932
FME-220B20A/150V
FA5500A: 11.5V ON / 9V OFF
FA5501A:13V ON / 9V OFF
A Custom
1 2
Title
Size Document Number Rev
Date: Sheet of
R952
1K 1/16W
+ C935
470uF/35V
CN923
12P/2.0mm
1
2
3
4
5
6
7
8
9
10
11
12
C923 shift vally 翴
D924
1N4148
C909
0.22uF/250V
+
C924
47uF/50V
R981
10K 1/10W 1%
R978
0 1/10W
S_PROTECTION
+ C951
47uF/50V
C112
0.1uF
C987
0.1uF/50V/1206
R926
20K 1/10W
R969
0.82 2W
L902
1 4
2 3
R993
1K 1/10W
!
IC111
NCP305
1
2 3
4
OUT
VIN N.C
GND
IC912
PC123FY2 4P
1
2
4
3
HS3
H/S D920
1
2
VCC3
VCC1
51K==>5.7A
SMD4148
56K==>5.0A
+ C933
1000uF/35V
ZD911
RLZ2.2B
1
2
Q901
STP20NM60FP
C964
0.1uF
GND3
GND
1
!
R908
0 1/10W
R973
100K 1/10W
D923
1N4148
R941
470 1/6W
R942
2K 1/10W
D919
LL4148WP
D101
SR54
C965
1000PF/1KV
Q924
PMBS3906
3 2
1
R907
68K 1/10W
!
HS4
H/S D910
1
2
!
+
C913
22uF/50V
RJ902
8m
1 2
12V
C974
0.01UF/1KV
12V
IC921
KIA431
R985
10K 1/10W
R902
390K 1/8W
R111
4.7M 1/8W
AC INLET 1
AC INLET
1 2 3
D902
YG972S6R
SI-8120
IC101
5 3
4
1 2
S.S GN
D
VOS
VIN SWout
!
Q916
DTC144WKA
3
2
1
S_PROTECTION
Q925
PMBS3904
3
2
1
ךְ FUSE
R979
10K 1/6W
Q913
PMBS3904
3
2
1
!
Q907
AO4411
1
2
3
4
8
7
6
5
S1
S1
S1
G1
D1
D1
D1
D1
+ C956
10uF/50V
C938
1000PF/1KV
C915
0.01uF
12V
!
R122
4.7K 1/10W
Q914
PMBS3906
3 2
1
24VIN
120K==>2.7A
150K==>2.2A
RJ901
8m
1 2
D920
FMW-2156
!
CN921
14P/2.0mm
1
2
3
4
5
6
7
8
9
10
11
12
13
14
R904
620K 1/8W
HS6
H/S IC903
1
2
Q101
PMBS3904
3
2
1
B+
R930
100 1/10W
C973
0.1uF
R954
56K 1/16W
R928
22 1/10W
R995
1K 1/10W
R939
47 /1W
GND1
GND
1
C962
0.1uF
R945
0 1/10W
+ C932
1000uF/35V
Q902
STP12NK80ZFP
C905
1000PF/250V
R903
620K 1/8W
ZD903
MTZJ27B(24.97~26.26V)
1
2
FP130
IC932
2
3 4
1 5
Vss
Vip Vin
out Vcc
IC922
KIA431
C903
1000PF/250V
24VIN
51K==>6.0A
DIP4148
56K==>5.4A
!
!
R906
10K 1/10W 1%
C916
220pF
!
C969
0.1uF
R950
1K 1/16W
!
L903
120UH
VFB
R955
1K 1/16W
VCC3
R101
1.5K 1/10W
L101
45UH
R992
470 1/8W
!
+ C939
1000uF/25V
R104 10K 1/10W
B+
Demag The auxiliary FLYBACK signal
ensures discontinuous operation and
offers a fixed
overvoltage detection level of 7.2
V.
D903
LL4148WP
C902
1000PF/250V
C921
0.01UF/1KV
R918
18K 1/10W 1%
R114
330K 1/8W
Q922
PMBS3904
+
C958
1000uF/16V
C971
0.1uF
R910
20K 1/10W
R965
100K 2W
Q102
PMBS3904
3
2
1
C914
0.1uF
TVS901
P6KE12A
1
2
C103
0.1uF R901 390K 1/8W
24VS
SCR901
2N5060
3
1
2
L911
1 4
2 3
R921
10K 1/8W
VCC Increasing Level at which the
Current Source Turns.Off 6 VCCON
11.6 12.5 13.7 V
!
!
+
C907
MXY 180uF/450V 25*40
t
NR901
5A/3
1
2
L906
3.5UH
R982
200K 1/10W
R112
4.7M 1/8W
12VIN
R916
330K 1/8W
R974
16K 1/10W
C901
1000PF/250V
NCP1377 VCC
13.8 ON
20V 籹祘
!
C954
4700PF/25V
+
C920
22uF/50V
R991
470 1/8W
Q923
PMBS3904
3
2
1
+
C957
1000uF/16V
IC910
PC123FY2 4P
1
2
4
3
D917
BA159G
-+
BD901
D10XB60
1
4
3 2
CN925
4P/2.0mm
1
2
3
4
5V
IC911
PC123FY2 4P
1
2
4
3
R905
0 1/8W
D916
BA159G
R986
1K 1/10W
C944
0.1uF
22V
+ C955
10uF/50V
D908
LL4148WP
T902
EFD25/ Lp=?UH
9
5
4
3
1 6
7
10
!
R105 1K 1/10W
C917
0.47uF/25V
R929
20K 1/10W
ZD909
RLZ15B
1 2
This IC uses a CMOS device with high dielectric
strength (30V) to implement low power
consumption.
!
R976
470 1/6W
HS5
H/S D931
1
2
R935
20K 1/10W
R121
68K 1/8W
12V
IC903
STR-A6252
8 7 5
4 2 1 3
D2 D1
VC
C
FB FM OC
P
GN
D
ZD901
RLZ15B
1
2
!
L901
1 4
2 3
C923
82PF
L911
R925
47K 3W
C943
0.1uF
ZD904
MTZJ24B(22.61~23.77V)
1
2
C963
0.1uF
12VIN
Q915
PMBS3904
3
2
1
audio power
D907
BA159G
R994
1.5K 1/10W
R959
120K 1/16W
D910
20A/150V
J938
jumper
C936
0.1uF
C929
0.01UF/1KV
ZD905
MTZJ15B(13.89~14.62V) 1
2
C988
0.1uF
FB101
BEAD
C111
0.01UF/1KV
!
C960
0.1uF
R911
470 1/10W
F902
R30-250(30V/2.5A)
CN924
9P/2.0mm
1
2
3
4
5
6
7
8
9
C912
1uF/450V
CN901
3P/3.96mm
1 2 3
C970
0.1uF
D906
BA159G
R922
240 1/8W
R931
0.22 3W
RV901
Varistor
+
C959
470uF/16V
C900
1000PF/250V
24V
VCC1
!
HS1
H/S Q901
1
2
R953
1K 1/16W
R989
JUMPER
R909
22 1/10W
+ C931
1000uF/35V
R956
1K 1/16W
R958
1K 1/16W
R977
2K 1/10W
C952
0.1uF
F903
6.5A/63V/1206
+
C102
1000uF/35V
+ C941
470uF/25V
F901
5A/250V
5VS
!
L904
PFC CHOKE PQ3225
10
2
12
3 5 6
ZD906
RLZ5.6B
1
2
N.C R920 100 1/8W
R998
100 1/8W
22V
R915
330K 1/8W
R999
100 1/8W
C950
1000PF/1KV
HS7
H/S BD901
1
2
L905
3.5UH
Q921
PMBS3904
C101
0.1uF
CN922
10P/2.0mm
1
2
3
4
5
6
7
8
9
10
24V
VCC2
!
R947
1.5K 1/10W 1%
R943
0 1/10W
D933
LL4148WP
!
C966
0.1uF
C961
0.1uF
C967
1uF
FOR BACKLIGHT
24V/4.5A
R970
5R1 1/8W
C953
0.22uF/25V
C908
0.22uF/250V
Q912
PMBS3906
3
2
1
C968
0.1uF
!
D925
0.8A/200V SOD-123
IC902
NCP1377
1
2
3
4
8
7
6
5
Demag
FB
CS
GND
HV
N.C
Vcc
Drv
J916
0 1/6W
D915
LL4148WP
D901
1N5406
R927
10K 1/10W
5V
Q910
PMBS3904
3
2
1
GND2
GND
1
R949
20K 1/10W
D931
FME-220B20A/150V
ZD910
RLZ18B
1
2
R997
100 1/8W
PS
C922
0.0022uF/1KV
R946
15K 1/10W 1%
D111
BA159G
R940
47 /1W
R987
33K 1/10W
R919
10K 1/10W 1%
S_PROTECTION
D914
LL4148WP
R980 1K 1/10W
Demg 筿瑈禬筁 3mA 穦玂臔
D921
LL4148WP
C930
1000PF/1KV
L907
3.5UH
R113
4.7M 1/8W
T901
ER4224 Lp=?UH
9
8
6
5
1 11
12
10
15
16
14
13
7
3
C927
470PF
GND4
GND
1
AC INLET 3
WIRE L/N
1 2 3
AC INLET 2
WIRE GREEN
1 2 3
!