LG 42LE550N Service Manual page 20

New Item Development
EARPHONE BLOCK
HP_LOUT
HP_ROUT
COMPONENT
PPJ234-01
JK900
THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES
SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.
FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR
THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.
Copyright © 2010 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
OPT
C902
1000pF
C
50V OPT E
OPT
Q900 B
+3.3V_NORMAL
MMBT3904-(F)
MMBT3904-(F)
B Q903
E
C
R912
1K
HP_DET
OPT
C903
C
1000pF E
OPT OPT
50V
Q901 B
MMBT3904-(F) +3.5V_ST
MMBT3904-(F)
B Q902
E
C
R914
10K
+3.3V_NORMAL
R902
10K R903
1K
D900 C931
5.6V
100pF
50V
L904
270nH
[GN]E-LUG
C932 C904
D903
27pF 27pF
6A 5.1V
[GN]O-SPRING 50V
50V
D910
5A 5.1V
[GN]CONTACT
L903
270nH
4A
[BL]E-LUG-S
C933 C906
7B
27pF
27pF
[BL]O-SPRING
50V 50V
5B L902
[RD]E-LUG-S
270nH
7C
[RD]O-SPRING_1 C934 C905
27pF
27pF
5C
50V
50V
[WH]O-SPRING
C935
R910
5D 0
[RD]CONTACT
1uF
R907
4E D901 C939
5.6V 470K
[RD]O-SPRING_2
100pF
50V
5E
[RD]E-LUG
C936
R909
6E 0
1uF
R961
D902
C937
5.6V 470K
100pF
50V
JK901
KJA-PH-0-0177
GND 5
L 4
DETECT 3
R 1
SIDE_HP_MUTE
Rear CVBS
COMP2_DET
COMP2_Y
REAR_AV
JK902
PPJ233-01
[RD]E-LUG
5C
COMP2_Pb
[RD]O-SPRING
4C
[RD]CONTACT
3C
[WH]C-LUG
4B
COMP2_Pr
[YL]CONTACT
3A
[YL]O-SPRING
4A
COMP2_L_IN
[YL]E-LUG
5A
COMP2_R_IN
REAR_AV
REAR_AV_CVBS
R957
0
REAR_AV
REAR_AV
C909
D906
47pF
5.5V
50V
+3.3V_NORMAL
REAR_AV
R925
10K
REAR_AV
AV_CVBS_DET
R926
REAR_AV 1K
D909
C910
5.6V
100pF
REAR_AV
50V
C941
R928
0
REAR_AV_R_IN
REAR_AV
1uF
REAR_AV
R921
C916
D908
470K 100pF
5.6V
REAR_AV 50V
REAR_AV
REAR_AV
REAR_AV
C940
R927
0
REAR_AV_L_IN
1uF
REAR_AV REAR_AV REAR_AV
REAR_AV
R920 C915
D907
100pF
470K
5.6V
50V
ETC SUB BOARD I/F
EUROBBTV 2009.06.18
9
LGE Internal Use Only