LG DM5420K, Service Manual

Page: 36 / 51

3-21 3-22
CIRCUIT DIAGRAMS
1. SMPS CIRCUIT DIAGRAM
IMPORTANT SAFETY NOTICE
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 ONLY WITH TYPES IDENTICAL
TO THOSE IN THE ORIGINAL CIRCUIT. SPECIAL
COMPONENTS ARE SHADED ON THE SCHEMATIC
FOR EASY IDENTIFICATION.
THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIFFER
FROM THE ACTUAL CIRCUIT USED. THIS WAY,
IMPLEMENTATION OF THE LATEST SAFETY AND
PERFORMANCE IMPROVEMENT CHANGES INTO
THE SET IS NOT DELAYED UNTIL THE NEW SERVICE
LITERATURE IS PRINTED. 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.
A
1
2
3
4
5
6
7
8
9
10
11
12
B C D E F G H I J K L M N O P Q R S T
SMPS
2012. 03. 09
72SWLRQ
DM5420/5320=R909-OR
DM5620/5520=R909-1OR
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DM5420/DM5320=4A(GBU4J)
1.DM5620/DM5520=STR-X6757N
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1 ǃ R910= NC
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3.DM5520=R948/22K 1%,R969/3.3K 1%
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1.DM5420/5320=1000uF/50V,1000uF/50V
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2.DM5420/DM5320=110V(180uF/250V)
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DM5420/DM5320=3.15A
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1.DM5420/DM5320=5D-11 4A/5R 90
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DM5620/5520: EBJ4934901
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DM5420/5320=D909-UF4007
DM5620/5520=D909-HER207
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DM5420/DM5320(LF901,LF902)=SQE2424S
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DM5620/DM5520(LF901,LF902)=SQE2828
2.DM5620/5520=SFAF2004G,20A/200V
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1.DM5420/5320=SFAF1004G,10A/200V
DIODE Option
DM5620/5520:NC
cap Option (C904)
1.DM5420/DM5320WIDE(NC)
2.DM5620/DM5520=WIDE(68uF/450V)
4
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R910= 0.22R 1W
6
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R908=0.22R 1W
5
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R912=0.22R 1W
DM5620/DM5520
DM5420:27V/0.5W
1.DM5320=R948/10K 1%,R969/909R1%
4.DM5620=R948/22K 1%,R969/909R 1%
3.DM5520=34.5V/7.5A
4.DM5620=31V/7.5A
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C903
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C921
10UF
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C950 2200UF/50V
C951
2200UF
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C946
1UF/50V
C990
100UF
/16V
C948
330UF/16V
C971
100UF/50V
C935
47UF/50V
C934
47UF/50V
C932
330UF/16V
C965
1000UF/50V
C979
1000UF/25V
C970
1000UF/25V
C945
1000UF/16V
C981
1000UF/16V
C947
10UF/50V
C976
1000UF/16V
C922
470UF/16V
C977
1UF/50V
C949
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C995
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C978
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CY907
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C936
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CAUTION:
Danger if fuse is incorrectly replaced.
Replace only with the type identical to fuse rating
and(or) model name described in main label.
Warning
Parts that are shaded are critical with
respect to risk of fire or electrical shock.