LG 37LH250H Service Manual page 37

UART
+5V_ST_PTC
+3.3V_ST
R2521 R2522
4.7K
4.7K
Q1200
BSS83
D
012:J8
PTC_RX_MSTAR_5V B
S
008:AQ27
PTC_RX_MSTAR
GND
R910
0
009:Q29;012:Q8 PTC_DEBUG_TX
OPT
R909
0
012:K17 PTC_TX_1
R955
0
009:AF26 PTC_TX
OPT
R907 0
R956 100
008:AO31 RX_G6
OPT
R958 0
R957
0
OPT
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.
R917 10K
012:C9 PTC_TX_1
+5V_ST_PTC
2SC3875S(ALY)
R912 10K
009:AF25;012:J7 PTC_RX_5V
+3.3V_ST
G
MLB-201209-0120P-N2
C902
IC901
0.1uF
MC14053BDR2G
Y1 VDD
1 16
Y0 Y R913
0
2 15
PTC_TX_MSTAR
Z1 X R914
0
3 14
PTC_RX_MSTAR_5V 012:D13
Z X1 R915 0
4 13
PTC_DEBUG_RX
OPT +5V_ST_PTC
Z0 X0 R916
0 009:AF25;012:K14
5 12
PTC_RX_5V
OPT
TX_F5
INH A
R918 100 0 R959 008:AR32
6 11
VEE B
R919 100
7 10
VSS C
R920 100
8 9 Q905
OPT
2SC3875S(ALY)
OPT
R925
+5V_ST_PTC +5V_ST_PTC
R927
22K
R922
22K
Q903
2SC3875S(ALY)
C
R923 1K B
Q902
2SC3875S(ALY)
C
E
B
E
+5V_ST_PTC
R928
22K
R921
22K Q904
2SC3875S(ALY)
C
R924 1K B
Q901
C
E
B
C903
E
0.33uF
C905
+5V_ST_PTC
L900
008:AB27 MSTAR_TX
008:AQ28
009:Q29;012:D9 PTC_DEBUG_TX
009:Q29;012:Z7
R926
10K
C
B R929 1K
UART_SWB 009:W35
+5V_ST_PTC
E
+3.3V_ST
R1201
R1200
4.7K
4.7K
Q1201
BSS83
D
B
S
GND
Serial Port
+5V_ST_PTC
IC902
ST3232CDR
C907
C1+ VCC
1 16 0.1uF
C904
0.047uF
V+ GND
2 15
C1- T1OUT R932 100
3 14
C906
C2+ R1IN R934 100
4 13
C909
0.33uF
220pF
C2- R1OUT R935 0
5 12
0.33uF V- T1IN R933 100
6 11
T2OUT T2IN
7 10
R2IN R2OUT
8 9
IC903
MC14053BDR2G
Y1 VDD
R930 100
1 16
Y0 Y
R931 100
2 15
Z1 X
3 14
Z X1
4 13
Z0 X0
5 12
INH A
R936 100
6 11
VEE B
R937 100
7 10
VSS C
R938 100
8 9
+3.3V_ST
G
37LH250H
UART
P900
KCN-DS-1-0088
1
RxD 6
2
7
3
8
4
C910
9
5
10
220pF
D900 D901
SDC15 SDC15
A1 A1
C C
A2 A2
+5V_ST_PTC
L901
MLB-201209-0120P-N2
C908
0.1uF
R939 100
MSTAR_RX
008:AB27
R940 100
PTC_DEBUG_RX009:Q29;012:J8
+5V_ST_PTC
R941
10K
C
Q906 B R942 1K
UART_SWA
2SC3875S(ALY) 009:W36
E
09.05.19
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