LG 42LY750H Service Manual page 33

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES
SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.
FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR
THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.
Copyright ⓒ 2014 LG Electronics. Inc. All right reserved.
Only for training and service purposes
IR OUT for RS232
+3.5V_ST
R3835
10K
R3837 22
IR_OUT
C
R3836 10K Q3803
IR_OUT_RS232
2SC3052
B
E
Serial UART for Commercial
+3.5V_ST
IC3801
MC14053BDR2G
C3805
0.1uF
Y1 VDD
UART3_TX 1 16
Y0 Y R3805 100
PTC_TX 2 15 SOC_RX_PTC
Z1 X
3 14
RESET_BY_CPU SOC_TX_PTC
R3803 10K Z X1 R3806 1K
4 13
RESET_HIGH UART3_RX
R3804 47K Z0 X0
5 12
PTC_RX_5V
INH A
R3808 100
6 11
VEE B
R3809 100
7 10
VSS C
R3810 100
8 9 Q3801
MMBT3904(NXP)
+3.5V_ST
IC3802
C3807
MC14053BDR2G
0.1uF
Y1 VDD
SOC_TX_RS232 1 16
Y0 Y
R3823 100
UART3_TX 2 15
Z1 X
3 14
/UPDATE_BY_CPU
Z X1
4 13 R3824
UPDATE_SW
R3822 47K Z0 X0 R3825
5 12
INH A R3826 100
6 11
VEE B
R3827 100
7 10
VSS C
R3828 100
8 9
C3808 Q3802
4.7uF
MMBT3904(NXP)
10V
RS232C
IR_OUT
IC3800
+3.5V_ST
MAX3232CDR
0.1uF C3800 C1+ VCC
1 16
C3804
V+ GND
C3801 0.1uF
0.1uF 2 15
C1- DOUT1
3 14
C2+ RIN1
0.1uF C3802
4 13
C2- ROUT1
5 12
C3803 V- DIN1
0.1uF
6 11
DOUT2 DIN2
7 10
R3812
RIN2 ROUT2
8 9
EAN41348201
Objective SW_A
MTK DEBUG
PTC DEBUG
PTC OAD
COM/MON
+3.5V_ST
SIMULATION
R3815
10K
C
B R3816 10K
UART_SWB
C3806
E 0.47uF
OPT
R3817
10K
+3.5V_ST
RS232_TX
RS232_RX
100
SOC_RX_RS232
100
UART3_RX
+3.5V_ST
R3829
10K
C
B R3830 10K
UART_SWA
R3831
E
10K
EXT_12V
10
5
JP3803
L3801
9
JP3804
4
JP3805
8
100 JP3808
R3820 C3809 3
220pF
7
100
JP3809
2
R3821 C3810
220pF
+3.5V_ST
6
D3804 D3805 1K
50V
20V 20V 1
R3834
BAP70-02
D3803
SPG09-DB-009
JK3803
1A@12V FOR COMMERCIAL(RS-232C POWER)
FOR COMMERCIAL
100
RS232_RX
RS232_TX
SW_B PC_SIM
0 X X
1 1 X
0 0 X
X 1 1
X 1 0
xxLY750H-UA
RS232/UART
2013.12.24
8 21
LGE Internal Use Only