Circuit Diagrams; Smps Circuit Diagram - LG XA66 Service Manual

CIRCUIT DIAGRAMS

1. SMPS CIRCUIT DIAGRAM

12
HV300V
BD901 BD901
KBL406 KBL406
11
+ +
1
+
C925 C925
2
AC
100uF/450V 100uF/450V
3
AC
4
-
10
AC1
9
CM902 CM902
0.1uF/275V 0.1uF/275V
R901 R901
1.5M 0.5W 1.5M 0.5W
3 4
8 3 4
LF901 LF901
35MH/2.5A 35MH/2.5A
2 1
2 1
7
CM901 CM901
0.22uF/275V 0.22uF/275V
V V
VR901 VR901
14D681K 14D681K
6
F901 F901 RT901 RT901
T2.5AL250V T2.5AL250V 5D-9 5D-9
C948 C948 C949 C949
102P/250V 102P/250V 102P/250V 102P/250V
5
CN901 CN901
AC IN AC IN
Q941 Q941
4
R912 R912 8050 8050
3
VCC
4R7 4R7
+ +
C960 C960 ZD906 ZD906
47uF/50V 47uF/50V 27V 27V
3
PC902 PC902
PC817 PC817
2
+5V
R914 R914
1K 1K
1
A B C D
T901 T901
EEL19 EEL19
10
10
R905 R905 C901 C901
R903 R903 100K/2W 100K/2W 222P/1KV 222P/1KV
NC NC R904 R904
10K 1/2W 10K 1/2W
9
9
D905 D905
R902 R902 1N4007 1N4007
NC NC IC901 IC901
DM311 DM311 FB904 FB904
6 8
Drain 8
FB FB
4 7
nc Drain
8
Drain
VCC
PWM PWM
R932 R932
NC NC D902 D902
CT2
CT2
FR107 FR107
3
Vfb
1
GND
D906 D906
R907 R907 1N4007 1N4007
CT1
CT1
22R 22R
C902 C902 + +
ZD903 ZD903 C926 C926
15V 15V 0.1uF 0.1uF 10uF/50V 10uF/50V 7
7
C946 C946
RW908 RW908
102P/250V 102P/250V
0R 0R
4
4
R909 R909 C903 C903 ZD905 ZD905
27K(NC) 27K(NC) 333P 333P 9.1V 9.1V
3
3
PC903 PC903
PC817 PC817
T902 T902
HV300V EI33 EI33
1
1
R910 R910 C904 C904
56K/2W 56K/2W 222P/1KV 222P/1KV
2
2
D907 D907
IC902 IC902 UF4007 UF4007
7M0880 7M0880
1 3
Drain 3
FB902 FB902
3
VCC
FB FB
C911 C911
PWM PWM 4
4
101P/1KV 101P/1KV
5
Start
2 5
GND 5
+ +
C927 C927
1
2.2uF/16V 2.2uF/16V
6
6
+ +
7
7
C954 C954 C905 C905
47uF/50V 47uF/50V 0.1uF 0.1uF
R921 R921
22R 22R PC901 PC901
PC817 PC817
4
4
C906 C906
0.1uF 0.1uF
ZD904 ZD904
3
3
C932 C932 9.1V 9.1V
ZD907 ZD907 473P 473P
3V3 3V3
Q921 Q921
8050 8050 R915 R915 C947 C947
2K 2K
2
STBY
102P/250V 102P/250V
R916 R916
10K 10K
E F G H
IMPORTANT SAFETY
WHEN SERVICING THIS CHASSIS, UNDER NO
CIRCUMSTANCES SHOULD THE ORIGINAL DESIGN
BE MODIFIED OR ALTERED WITHOUT PERMISSION
FROM THE LG CORPORATION. ALL COMPONENTS
SHOULD BE REPLACED
IDENTICAL TO THOSE IN THE ORIGINAL CIRCUIT.
SPECIAL COMPONENTS ARE SHADED ON THE
F+
Q901 Q901
1 8050 8050 3 F+
D909 D909
1
1
FR107 FR107 R917 R917 Q902 Q902
R935 R935 10K 1W 10K 1W 8550 8550
3 1
47K 47K
R918 R918
C940 C940 C923 C923 10K 10K
2
220uF/35V 220uF/35V 0.1uF 0.1uF
F-
D910 D910 F-
2
2
FR107 FR107
-VEE
ZD901 ZD901
3.3V 1/2W 3.3V 1/2W
D911 D911 R922 4.7R R922 4.7R
3 1 3
3
FR107 FR107 8550 8550
Q904 Q904
C939 C939 C950 C950 C937 C937 C908 C908
220uF/35V 220uF/35V 0.1uF 0.1uF 220uF/35V 220uF/35V 0.1uF 0.1uF
D912 D912
4
4
FR204 FR204 L903 L903
+ + + +
100uH/1A 100uH/1A
C942 C942 C909 C909 C941 C941 C910 C910
470uF/25V 470uF/25V 0.1uF 0.1uF 470uF/25V 470uF/25V 0.1uF 0.1uF
5
5
C945 C945 C914 C914 C943 C943 C912 C912
1000uF/16V 1000uF/16V 0.1uF 0.1uF L904 L904 1000uF/16V 1000uF/16V 0.1uF 0.1uF
D914 D914
6
6
SR360 SR360 100uH/1A 100uH/1A
C922 C922 R948 R948 +12V
472P(NC) 472P(NC) 5.1R(NC) 5.1R(NC) R952 R952
2
R936 R936
330R 330R 560R 1/2W 560R 1/2W
1
1
R938 R938
R937 R937 10K 10K
1K(NC) 1K(NC)
2
2
C913 C913 R939 R939
0.1uF 0.1uF 0R 0R
3
R940 R940
IC903 IC903 9.1K 9.1K
TL431 TL431
8
8
D918 D918 UF5404 UF5404
-VCC
D915 D915 UF5404 UF5404
9
9
L905 L905
C915 C915 R941 R941 20uH/3A 20uH/3A
222P/1KV 222P/1KV 22R 22R
10
10
C929 C929 C916 C916 C930 C930 C917 C917
1000uF/35V 1000uF/35V 0.1uF 0.1uF 1000uF/35V 1000uF/35V 0.1uF 0.1uF
11
AGND
11
C931 C931 C919 C919 C933 C933 C920 C920
12
12
1000uF/35V 1000uF/35V 0.1uF 0.1uF 1000uF/35V 1000uF/35V 0.1uF 0.1uF
C918 C918 R942 R942
222P/1KV 222P/1KV 22R 22R +VCC
13
13
L906 L906
D916 D916 UF5404 UF5404 20uH/3A 20uH/3A
14
14
D917 D917 UF5404 UF5404
R943 R943 ZD908 ZD908 R968 R968
1K 1K 18V 18V 5.6K 5.6K
R944 R944
R958 R958 68K 68K
1
1
10K 10K
C921 C921 R946 R946
2
2
0.1uF 0.1uF 10K 10K
3
IC905 IC905 R947 R947
TL431 TL431 4.7K 4.7K
AGND
-VCC
I J K L M
3-25 3-26
SCHEMATIC FOR EASY IDENTIFICATION. THIS
CIRCUIT DIAGRAM MAY OCCASIONALLY DIFFER
FROM THE ACTUAL CIRCUIT USED. THIS WAY,
IMPLEMENTATION OF THE LATEST SAFETY AND
ONLY WITH TYPES PERFORMANCE IMPROVEMENT CHANGES INTO
THE SET IS NOT DELAYED UNTIL THE NEW SERVICE
LITERATURE IS PRINTED.
F-
F+
-24V
VFPWR
+12V
-12V
R919 R919 +5V
10K 10K
2
Q903 Q903 +VCC
8550 8550 +12V
R920 R920 3 1 -VCC
10K 10K
STBY
R923 R923 -12V
1K/1W 1K/1W VFDP
NC
ZD902 ZD902 C936 C936
12V 12V 220uF16V 220uF16V
Q905 Q905 +12V
8550 8550
1 3
+ +
C938 C938
2
R924 R924 100uF/16V(NC) 100uF/16V(NC)
5K1 5K1
+5V
R925 R925
330R 1W 330R 1W
+ +
R956 R956 C968 C968
4K7(nc) 4K7(nc) 100uF/16V(nc) 100uF/16V(nc)
+5V
Q906 Q906 R955 R955
2
8050 8050 2K(nc) 2K(nc)
R927 R927 Q912 Q912 R957 R957
2
STBY
Q911 Q911 10K 10K 8050(nc) 8050(nc) 2K 2K
8050 8050
R934 R934
56R/2W 56R/2W Q910 Q910 VFPWR
8550 8550
1 3
C934 C934
2
R950 R950 0.1uF 0.1uF
5K1 5K1 +5V
R949 R949
330R 1W 330R 1W
+ +
R953 R953 C935 C935
4K7(nc) 4K7(nc) 100uF/16V(nc) 100uF/16V(nc)
Q908 Q908 R954 R954
2
8050 8050
2K(nc) 2K(nc)
R933 R933 Q909 Q909 2 R951 R951
VFDP
10K 10K 8050(nc) 8050(nc) 2K 2K
Warning
Parts that are shaded are critical with
respect to risk of fire or electrical shock.
N O P Q
NOTE :
1. Shaded( ) parts are critical for safety. Replace only
with specified part number.
2. Voltages are DC-measured with a digital voltmeter
during Play mode.
F- (3)
F+ (3)
-24V (3)
+12V (4)
-12V (4)
+5V (4)
+VCC (7)
-VCC (7)
STBY (3)
VFDP (3)
CN903 CN903
F- F-
1
1
F+ F+ 2
2
GND FGND
3
3
-VEE -24V
4
4
STBY STBY
5
5
VFDP VFDP
6
6
TO Front board
CN902 CN902
+5V
1
GND
2
+5V
3
GND
4
+12V
5
GND
6
-12V
7
TO MAIN TO MAIN
CN904 CN904
+VCC
1
AGND
2
-VCC
3
TO MAIN
SMPS
2011. 01. 20
Rev 1.1
R S T