Read LG 32LG3DCH (CHASSIS:LA76B) Service Manual online
1/10W
100K
5%
R947
10K
R929
R929
0
R919
0
R959
47pF
50V
C918
2SC3875S
Q1904
E
B
C
0.1uF
C909
0
R923
0
R921
2SC3875S
Q1902
E
B
C
470K
R966
R966
MPI_DOUT
009:AW25
SPI_DATA_OUT
009:AS25
5VST
MC9S12E128CFUE
IC900
1
PM3
2
RXD2/PM4
3
TXD2/PM5
4
SDA/PM6
5
SCL/PM7
6
FAULT0/PQ0
7
FAULT1/PQ1
8
FAULT2/PQ2
9
FAULT3/PQ3
10
VDDX
11
VSSX
12
IS0/PQ4
13
IS1/PQ5
14
IS2/PQ6
15
MODC/TAGHI/BKGD
16
IOC04/PT0
17
IOC05/PT1
18
IOC06/PT2
19
IOC07/PT3
20
IOC14/PT4
21
IOC15/PT5
22
IOC16/PT6
23
IOC17/PT7
24
PW10/IOC24/PU0
25
PW11/IOC25/PU1
26
XCLKS/NOACC/PE7
27
ECLK/PE4
28
VSSR
29
VDDR
30
RESET
31
VDDPLL
32
XFC
33
VSSPLL
34
EXTAL
35
XTAL
36
TEST
37
PW12/IOC26/PU2
38
PW13/IOC27/PU3
39
IRQ/PE1
40
XIRQ/PE0
41
PS0/RXD0
42
PS1/TXD0
43
PS2/RXD1
44
PS3/TXD1
45
PS4/MISO
46
PS5/MOSI
47
PS6/SCK
48
PS7/SS
49
VDD2
50
VSS2
51
PAD00/AN00/KWAD00
52
PAD01/AN01/KWAD01
53
PAD02/AN02/KWAD02
54
PAD03/AN03/KWAD03
55
PAD04/AN04/KWAD04
56
PAD05/AN05/KWAD05
57
PAD06/AN06/KWAD06
58
PAD07/AN07/KWAD07
59
VDDA
60
VRH
61
VRL
62
VSSA
63
PAD08/AN08/KWAD08
64
PAD09/AN09/KWAD09
65
PAD10/AN10/KWAD10
66
PAD11/AN11/KWAD11
67
PAD12/AN12/KWAD12
68
PAD13/AN13/KWAD13
69
PAD14/AN14/KWAD14
70
PAD15/AN15/KWAD15
71
PM0/DA0
72
PM1/DA1
73
VSS1
74
VDD1
75
PP5/PW05
76
PP4/PW04
77
PP3/PW03
78
PP2/PW02
79
PP1/PW01
80
PP0/PW00
0
R901
220pF
50V
C910
1/10W
100K
5%
R946
SPI_DATA_IN
009:V24
1000pF
50V
C911
10uF
16V
C903
4.7K
R936
MISO
009:AM26
10K
R954
330
R943
100
R916
330
R942
2SC3875S
Q1907
E
B
C
2SC3875S
Q1903
E
B
C
VCC1
VCC1
0.1uF
50V
C904
10K
R911
R911
0.1uF
50V
C901
0
R930
5VST
10uF
16V
C902
MPI_DOUT
009:S9
0
R904
330
R952
OPT
0
R926
0
R908
7.37280MHz
X900
6
SV
1
VC
2
TRI-STATE
5
NC
3
GND
4
OUTPUT
0
R957
0
R905
0
R902
100
R922
0
R958
10K
R962
R962
1/10W
10K
5%
R939
0
R907
330
R941
5VST
4.7K
R969
5VST
5VST
MISO
009:V25
GIL-G-06-S3T2
P902
1
2
3
4
5
6
1uF
10V
C913
IR
001:R7;003:P16
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.
100
R978
0.1uF
50V
C914
SAM2333
OPT
LD900
A2[GN]
C
A1[RD]
4.7K
R948
IR_IN_MODEM
009:U6
0
R900
4.7K
R913
10K
R924
R924
1/10W
10K
5%
R935
4.7K
R968
100K
R920
R920
VCC1
5VST
0.01uF
50V
C912
2SC3875S
Q1900
E
B
C
330
R912
R912
PTC_RX
011:B10;011:C20
SCK 009:V25
0.1uF 50V C906
4.7K
R975
R975
5VST
0.22uF
25V
C908
VCC1
0
R932
PTC_OPT
FM24C16A
IC901
3
NC_3
2
NC_2
4
VSS
1
NC_1
5
SDA
6
SCL
7
WP
8
VDD
10
R910
R910
0
R917
1uF
10V C905
VCC1
009:Y26;009:AA26;009:AB26;009:AB19;009:AF21;009:AL29
100
R965
4.7K
R961
R961
1uF
C907
SPI_CLOCK
009:S8
0.1uF
50V
C915
SPI_CLOCK
009:V24
EXTERNAL_PTC_RESET
009:Z33
330
R909
0
R944
R944
10K
R953
R953
0
R
956
100K
R928
R928
GND
4.7K
R915
0
R933
PTC_OPT
0
R931
PTC_OPT
4.7K
R927
EXTERNAL_PTC_RESET
009:AF14
BUFFERED_MPI_DIN
009:AS26
0
R906
SPI_DATA_IN
009:S8
0.22uF
C917
SPI_DATA_OUT
009:S9
PEJ024-01
JK900
6B
T_TERMINAL2
8
SHIELD_PLATE
7B
B_TERMINAL2
5
T_SPRING
4
R_SPRING
7A
B_TERMINAL1
6A
T_TERMINAL1
3
E_SPRING
SAM2333
LD903
A2[GN]
C
A1[RD]
47pF
50V
C919
100
R918
PTC_TX
011:J11;011:J18
2SC3875S
Q1905
E
B
C
0
R955
0.1uF
50V
C900
330
R949
4.7K
R945
R945
4.7K
R925
R925
0
R903
100
R963
UART2_RX
011:C18
SAM2333
LD904
A2[GN]
C
A1[RD]
SCK
009:AL25
EK14
40
V
D900
5VST
VCC1
1uF
50V
C916
0
R934
UART2_TX
011:J19
4.7K
R960
R960
BUFFERED_MPI_DIN
009:S10
10K
R914
R914
5VST
GIL-G-02P
OPT
P903
1
2
330
R950
OPT
5VST
5VST
+5V_ST
+12V
0
R1911
0
R1914
0
R1910
OPT
0
R1909
PTC_OPT
0
R1908
OPT
0
R1907
0
R1906
PTC_OPT
0
R1904
PTC_OPT
0
R1901
0
R1903
0
R1902
0
R1900
ACD_RST
001:J10;001:AF7;005:P6;007:O25
P_ON_OFF
012:AB20
P_CH_DN
012:AB16
P_CH_UP
012:AB17
LED_GR1
003:R9
KEY_CTL_1
003:P18
KEY_CTL_0
003:P18
POWER_ONOFF_N
001:X7;001:Y6;001:AB12
22
R2093
PTC_OPT
LED_AM1
003:R11
0
R1905
PTC_OPT
DET_PILLOW
001:J10;012:F12
100
AR108
OPT
100
R2098
OPT
IR_IN_MODEM
009:P6
R1913
PTC_OPT
R1912
PTC_OPT
SIDEAV_SW
006:X20
100
PTC_OPT
R979
100
R980
OPT
0
R981
5%
1/10W
0
R987
5%
1/10W
0
R982
5%
1/10W
0
R986
5%
1/10W
0
R983
5%
1/10W
0
R984
5%
1/10W
0
R985
5%
1/10W
KPT-1115AM
SW102
KPT-1115AM
SW103
UPDATE_PTC
001:W19
SMAW200-11
P900
1
2
3
4
5
6
7
8
9
10
11
2SA1530A-T112-1R
Q1901
E
B
C
UART_SWA
011:K9
UART_SWYB
011:Q16
10K
R989
KDS184
D901
A2
C
A1
680
R990
3216
10uF 16V
C920
0.22uF
50V
C921
5VST
5VST
5VST
0
R
991
MSTAR_POWER_ON
007:W6
1N4148W
100V
D902
VCC1
MBW3216-501TF
L900
10K
R2130
OPT
RESET_PTC
001:W19
5VST
2.2K
R938
330
R940
330
R951
OPT
CM2012F1R0KT
L908
CM2012F1R0KT
L909
CM3216F100KE
L910
CM3216F100KE
L911
0
R964
RELAY_PTC
007:O23
EK14
40V
D903
12V_DCDC
MBRM140T1G
40V
D904
10uF
16V
C925
LT3479EFE
IC903
3
L
2
SW_2
4
VS
1
SW_1
6
RT
5
VIN
7
SHDN
8
GND
9
VREF
10
FBP
11
FBN
12
VC
13
SS
14
GND_1
15
GND_2
16
GND_3
0.01uF
50V
C924
0
R992
DCDC_EN
009:AH17
12V_DCDC
009:O14
5VST
10uH
L913
22K
R998
11K
R993
R993
10K
R995
R995
6.8K
R994
R994
1/10W
200K
5%
R997
2.2uF
16V
C922
2200pF
50V
C923
DCDC_EN
009:AL8
KIA7042AF
IC902
2
G
3
O
1
I
5VST
MUTE
001:Q5;005:S3
SUB_MUTE
001:J10;005:P25;005:V20
HP_MUTE
001:J5;005:AC26;012:N6
+12V_C
+12V_C
CB3216PA501E
L912
10K
R937
R937
0
R996
4.7K
R970
HOTEL_1V
1.2K
R971
HOTEL_1V
2K
R971-*1
HPT_2V
3K
R970-*1
HPT_2V
PTC_RX
08.3.14
LD1202 - Sending command to TV
LD1205 - Receiving response from TV
LD1201 - Power
LD1200 - Status (very helpful, you have to keep this)
LD1203 - Receiving Keycode, RJP and autosense message
LD1204 - SPI activity
LD1206 - PTC script running
LD1208 - SCI activity
12
PTC&MPI
9
32LG3DCH
Port Name action state
============================================================
PQ3: ACD_RST (DET_AC POWER DET)
PQ5: POWER_ONOFF (RELAY ON) ON:HIGH // OFF:LOW
PAD4: KEY_CTL_0 (ADC for FRONT KEY) ADC
PAD6: KEY_CTL_1 (ADC for FRONT KEY) ADC
PM0: LED_GR1 (Indicator) OPEN DRAIN(pull up 3.3v)
PM1: LED_AM1 (Indicator) OPEN DRAIN(pull up 3.3v)
PT4: AND_CH_UP (Pillow speaker ch up) If be able, This port is operated on Interrupt GPIO
(Seri
al)
PT3: P_CH_DN (Pillow speaker ch down) General GPIO
PT2: P_ON_OFF (Pillow speaker power on) General GPIO
PU2: INV_CTL (POWER INV CTL) ON:HIGH // OFF:LOW
PT5: PILLOW_DET (PILLOW SPEAKER SEL) INNER SPK:LOW // PILLOW SPK: HIGH
PE1, PANEL_CTL (PANEL POWER ON) ON:LOW // OFF:HIGH
PE0, 5V_MNT (LCD LAMP STATE DETECT) Stable: High // abnormal: Low ==> Invertor error
PW00-PW04, RJP PORT
RJP_CTRL0
RJP_CTRL1
RJP_CTRL2
RJP_CTRL3
RJP_CTRL4
PTC RESET & PTC UPDATE
PTC
12V_DCDC
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