LG 42LH3000 / 42LH3010 / 42LH3020 / 42LH3040 (CHASSIS:LD91A) Service Manual ▷ View online
- 17 -
5. RGB PC doesn’t display
Check P400 ,
Can you see the normal waveform?
NO
P400
may have problem. Replace this Jack.
Check the output of Main IC(IC100).
Especially you should check
The H,V sync and clock.
Can you see the normal waveform?
YES
NO
After checking the Power of Main IC(IC100) you
should decide to replace Main IC or not.
This board has big problem because Main
IC(IC100) have some troubles.
After checking thoroughly all path once again,
You should decide to replace Main Board or not.
YES
6. HDMI doesn’t display
Check input connect JK600, JK601, JK602
Can you see the normal waveform?
Check DDC communication lines(IC100,
IC107)
YES
YES
NO
JK600, JK601, JK602
may have problem. Replace this Jack.
NO
After checking the Power of this chip, you
should decide to replace this or not.
YES
Check HDCP communication lines(IC107)
NO
After checking the Power of this chip, you
should decide to replace this or not.
Check the output of Main IC(IC100).
Especially you should check
The H,V sync and clock.
Can you see the normal waveform?
YES
NO
After checking the Power of Main IC(IC100) you
should decide to replace Main IC or not.
This board has big problem because Main
IC(IC100) have some troubles.
After checking thoroughly all path once again,
You should decide to replace Main Board or not.
- 18 -
BLOCK DIAGRAM
RGB
COMP
ON
ENT
F-SC
A
R
T
AV
3
BU
F_
TS_
C
LK/ER
R
/SY
N/
D
A
TA[0]
AV
_CVB
S
_
IN
DDR2 SDRAM
(1
G
b
)
IC
300
NAND Flas
h
HY
NI
X
IC1
0
2
USB
Digital am
p
(N
T
P
3100L
)
IC
701
COMP
_
Y
/P
b/
Pr
S
C
1_
CV
BS_I
N
S
C
2_
CV
BS_I
N
I2
S
DSUB
_ R
/G/
B
Tun er
(TDFW-G235D)
TU1200
LCD P
a
n
e
l
74LVC541A
Buffer
IC502
IC502
CI Slot
(P500)
74LCX244
Buffer
IC501
IC501
PCM_A
[0
:7
]
FE
_VMA
IN
PCM_A
[0
:7
]
SDDR_D[
0
:1
5
]
DDR2 SDRAM
(512
M
b
)
IC
301
TDDR_D[
0
:1
5
]
SDDR_A[
0
:1
2
]
Mstar
S6
LGE3368A
(I
C100)
M
P
6205
D
H
U
S
B Pow
e
r
IC
402
U
S
B Pow
e
r
F
E
_
T
S_
D
A
TA
[0:7]
∆
C
I_MDI[
0
:7
]
H-SC
A
R
T
SC1_R/G
/B
S
C
1/2_L
/R
_I
N
,
FE
_AM
_AUDI
O
,AV
_
L
/R_IN,
C
O
M
P
_L/
R
_
IN
, P
C
_L/
R_
IN
FE
_ V
O
UT
DTV/MNT
_V
OU
T
TDDR_A[0
:12]
T
P
A6110A
IC
700
Head
Phon
e
R
S
-232
C
M
A
X3232
C
D
R
IC
403
SP
DI
F
SPDIF_
O
U
T
DSUB
_H/
VS
Y
N
C
HP_
L
/R
O
UT
L/R
C
I_T
S_
DA
T
A
[0
:7]
PCM_D[
0
:7]
∆
CI_DATA[
0
:7]
CI_
ADDR[
0:
7
]
AUDI
O IN
DGB
_TX
/RX
HPD1
/2
/3
, HDMI
_CEC
TMDS[
0:
7
] ( D
a
ta
, Clock (+/-))
USB
_DM/DP
EE
PRO
M
M
2
4512
-W
M
W
6
(I
C
105
)
EE
PRO
M
CAT2
4WC0
8W-
T
(HDCP)IC10
7
I2
C
LVDS (10 bit)
S
e
rial Flash
IC
103
F
o
r Boot
K
IA7427
(I
C
101
)
Vo
lt
age De
te
cto
r
Res
et
5V_
H
D
M
I_1/2
/3
HDMI 1
/2/
3
- 19 -
300
200
A5
801
LV
1
A2
A10
802
803
804
805
521
400
900
120
510
301
500
310
302
540
530
550
806
200T
EXPLODED VIEW
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These
parts are identified by in the Schematic Diagram and EXPLODED VIEW.
It is essential that these special safety parts should be replaced with the same components as
recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
parts are identified by in the Schematic Diagram and EXPLODED VIEW.
It is essential that these special safety parts should be replaced with the same components as
recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
IMPORTANT SAFETY NOTICE
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.
PCM_A[0]
PCM_A[1]
PCM_A[2]
PCM_A[3]
PCM_A[4]
PCM_A[5]
PCM_A[6]
PCM_A[7]
PCM_A[7]
PCM_A[6]
PCM_A[5]
PCM_A[4]
PCM_A[0]
PCM_A[1]
PCM_A[3]
PCM_A[2]
PCM_A[8]
PCM_A[9]
PCM_A[10]
PCM_A[12]
PCM_A[13]
PCM_A[11]
PCM_A[14]
PCM_D[0]
PCM_D[1]
PCM_D[2]
PCM_D[3]
PCM_D[4]
PCM_D[5]
PCM_D[6]
PCM_D[7]
CI_TS_DATA[0]
CI_TS_DATA[1]
CI_TS_DATA[3]
CI_TS_DATA[2]
CI_TS_DATA[5]
CI_TS_DATA[4]
CI_TS_DATA[7]
CI_TS_DATA[6]
ISP_TXD
EEPROM_SDA
E20;T19;Y14
REAR_USB_DM
4:AJ5
REAR_USB_DP
4:AJ6
FE_TUNER_SDA
IC102
HY27US08121B-TPCB
26
NC_17
27
NC_18
28
NC_19
29
I/O0
30
I/O1
31
I/O2
32
I/O3
33
NC_20
34
NC_21
35
NC_22
36
VSS_2
37
VCC_2
38
PRE
39
NC_23
40
NC_24
41
I/O4
42
I/O5
43
I/O6
44
I/O7
45
NC_25
46
NC_26
47
NC_27
48
NC_28
17
ALE
3
NC_3
6
NC_6
16
CLE
15
NC_10
14
NC_9
13
VSS_1
12
VCC_1
11
NC_8
10
NC_7
9
CE
8
RE
7
R/B
4
NC_4
5
NC_5
25
NC_16
24
NC_15
23
NC_14
2
NC_2
22
NC_13
21
NC_12
1
NC_1
20
NC_11
19
WP
18
WE
Q100
KRC103S
OPT
E
B
C
+3.3V
PCM_A[0-14]
+3.3V
+3.3V
SPI_DI
/PF_CE0
IC103
W25X32VSSIG
3
WP
2
DO
4
GND
1
CS
5
DIO
6
CLK
7
HOLD
8
VCC
SPI_CS
+3.3V
Q101
KRC103S
OPT
E
B
C
+3.3V
+3.3V
FE_TUNER_SCL
SDA0
SCL0
Flash_WP_1
R174
0
R175
0
R102
0
OPT
R197
15K
OPT
R196
15K
OPT
R193
1M
R172
0
AR102
22
AR103
22
/PF_CE0
C4
/PF_CE1
D6
/PF_OE
C4
/PF_WE
D7
PF_WP
A7
PF_ALE
D6
/F_RB
C3
AR100
22
AR101
22
/F_RB
/PF_OE
/PF_WE
/PF_CE1
PF_ALE
PF_WP
PCM_A[0-7]
SPI_CS
SPI_CK
SPI_CK
SPI_DO
R101
0
SPI_DO
SPI_DI
G12
PCM_D[0-7]
PCM_RST
/PCM_OE
/PCM_REG
/PCM_WE
/PCM_IOWR
/PCM_IORD
/PCM_CE
/PCM_CD
/PCM_WAIT
/PCM_IRQA
PCM_5V_CTL
5:D24
CI_TS_DATA[0-7]
IR
11:X16;11:AD14
+3.3V_ST
SC_RE2
9:N25
SIDE_HP_MUTE
7:G26
SCART2_MUTE
9:AI24
NTP_MUTE
7:R15
BIT_SEL
6:AI16;6:AL7;6:AL12
HP_DET
AMP_RST
7:F6
SCART1_MUTE
9:AI25
ERROR_OUT
8:C6
SC_RE1
9:N24
KEY2
11:Y10
KEY1
11:Y9
BUF_TS_VAL_ERR
5:V21
BUF_TS_SYN
5:V22
BUF_TS_CLK
5:V21
BUF_TS_DATA[0]
5:V22
CI_TS_CLK
5:D10
CI_TS_SYN
5:D10
CI_TS_VAL
5:D10
USB_CTL
4:AL4
PWM1
C104
0.1uF
C106
0.1uF
C103
0.1uF
R1513
33
R1514
33
R1515
33
R1516
33
R1510
33
R1517
33
R1511
33
R1518
33
R1512
33
R1519
33
R112
1K
OPT
R105
1K
OPT
R103
10K
R104
10K
R111
3.9K
R1524
33
R1525
33
R1526
33
R1530
33
R1533
4.7K
+3.3V
EEPROM_SDA
E16;E20;T19
R1539
1K
R1540
1K
L102
EEPROM_SCL
E16;T19;Y13
IC107
CAT24WC08W-T
3
A2
2
A1
4
VSS
1
A0
5
SDA
6
SCL
7
WP
8
VCC
+3.3V
EEPROM_SDA
E16;T19;Y14
EEPROM_SCL
E19;T19;Y13
SCART2_DET
INV_CTL
8:M10
Flash_WP_1
A11
SCL1
T22
SDA1
T22
PANEL_CTL
8:Q8
WARM_LED_ON/LED_W
8:B11
DBG_RX
POWER_ON/OFF1
8:P5
USB_OCD
4:AG3
SDA_SUB/AMP
7:F12;11:AG10
SDA1
AK12
R123
0
FE_DEMOD_SDA
10:I12
SCL_SUB/AMP
7:F13;11:AG9
R128
0
R122
0
R129
0
EEPROM_SDA
E16;E20;Y14
SDA0
T21;Y14
SCL0
T21;Y14
R124
4.7K
FE_DEMOD_SCL
10:I12
EEPROM_SCL
E16;E19;Y13
R125
4.7K
SCL1
AK12
+3.3V
SCART1_DET
EEPROM_SCL
E16;E19;T19
ISP_RXD
COMP_DET
DSUB_DET
AV_CVBS_DET
4:M4
R151
0
R1509
0
OPT
R131
0
FRC/LVDS_B
MEMC_SCL
11:Q8
MEMC_SDA
11:J8
R130
0
FRC/LVDS_B
SDA0
T21;Y14
SCL0
T21;Y14
5V_HDMI_2
5V_HDMI_1
X100
12MHz
SB_MUTE
7:G25;7:R15;9:AI24;9:AI25
ISP_TXD
+3.3V_ST
R115
10K
IC101
KIA7427F
2
GND
3
OUT
1
VCC
C101
0.022uF
16V
R107
470
SIDE_USB_DM
4:AJ6
R132
15K
OPT
R133
15K
OPT
R179
0
R178
0
SIDE_USB_DP
4:AJ5
OPC_EN
11:N20
PWM0
PWM1
IC105
M24512-WMW6
3
E2
2
E1
4
VSS
1
E0
5
SDA
6
SCL
7
WC
8
VCC
DBG_TX
DBG_RX
EDID_WP
9:AI24
LVDS_SEL
10:AA4
+3.3V
C105
10uF
6.3V
LED_ON/LED_R
POWER_DET
/FE_RESET
MODEL_OPT_3
MODEL_OPT_2
MODEL_OPT_0
MEMC_RESET
+3.3V
MODEL_OPT_1
FE_AGC_SPEED_CTL
MODEL_OPT_1
MODEL_OPT_2
R189
0
MODEL_OPT_0
MODEL_OPT_3
R126
0
FE_BOOSTER_CTL
10:AA4
+5V_GENERAL
R1504
4.7K
FE_TUNER_SCL
AI13;10:I9
R1505
4.7K
FE_TUNER_SDA
AI13;10:I9
C111
20pF
C112
20pF
+3.3V
R1507
1.2K
R1506
1.2K
R1550
100
POWER_DET
+3.3V_ST
R1544
100
PWM0
PWM2
PWM_DIM
A_DIM
C1500
1uF
OPT
C1501
2.2uF
OPT
+24V/+15V
+12V/+15V
PWM2
11:AE17
PWM0
DBG_TX
POWER_DET
+3.3V_TUNER
R146
0
R116
0
R173
0
R168
0
R100
0
C114
0.1uF
C100
0.1uF
R150
100
OPT
R156
100
R147
100
R157
100
R166
100
R148
100
R160
100
R154
100
R183
100
R153
100
R190
100
R177
100
R191
100
R188
100
R127
100
R184
100
R185
100
R159
100
R186
100
R167
100
R1534
100
V4
R182
100
OPT
R1523
100
R187
100
OPT
R1520
100
R155
100
R192
100
R1601
100
R1600
100
FRC/LVDS_B
R1543
10K
R195
10K
R198
1K
R1500
1K
OPT
R199
1K
OPT
R1501
1K
R161
22
R171
22
R140
22
R141
22
R142
22
R143
22
R1537
22
R1538
22
R169
22
R170
22
R158 4.7K
R152
4.7K
OPT
R1521
3.6K
19~32
R1527
1K
1%
26~32
R1528
2.7K
1%
37~47
R1529
1.8K
37~47
C102
10uF
6.3V
R1502
2.2K
R1503
2.2K
R1611
100
R1603
3.3K
FHD
R1605
3.3K
LED_NORMAL
R1607
3.3K
FRC/LVDS_B
R1609
3.3K
IC100
LGE3368A (Saturn6 No-DivX)
HWRESET
D4
PCMD0/CI_D0
AC16
PCMD1/CI_D1
AA15
PCMD2/CI_D2
AA16
PCMD3/CI_D3
AC6
PCMD4/CI_D4
Y10
PCMD5/CI_D5
Y11
PCMD6/CI_D6
Y12
PCMD7/CI_D7
Y13
PCM_A0/CI_A0
AB16
PCM_A1/CI_A1
AC15
PCM_A2/CI_A2
AC14
PCM_A3/CI_A3
AB14
PCM_A4/CI_A4
AC12
PCM_A5/CI_A5
AB8
PCM_A6/CI_A6
AC13
PCM_A7/CI_A7
AA9
PCM_A8/CI_A8
AB5
PCM_A9/CI_A9
AA4
PCM_A10/CI_A10
V4
PCM_A11/CI_A11
Y4
PCM_A12/CI_A12
AB9
PCM_A13/CI_A13
AA7
PCM_A14/CI_A14
AD6
PCM_RST/CI_RST
AA14
PCM_CD/CI_CD
AB18
/PCM_OE
Y5
PCM_REG/CI_CLK
AB15
PCM_WAIT/CI_WACK
AA10
/PCM_IRQA
AC8
/PCM_WE
AC7
PCM_IOWR/CI_WR
AA5
PCM_IOR/CI_RD
W4
/PCM_CE
T4
/PF_CE0
AE6
/PF_CE1
AF6
/PF_OE
AA12
/PF_WE
AA11
PF_ALE
AC9
PF_AD15
Y14
F_RBZ
AB11
UART2_TX/SCKM
F8
UART2_RX/SDAM
D11
DDCR_DA
AB21
DDCR_CK
AC21
DDCA_CLK
J1
DDCA_DA
J2
UART_RX2
W5
UART_TX2
V5
PWM0
AB13
PWM1
AB12
PWM2
AD12
PWM3
AA13
SAR0
A4
SAR1
B4
SAR2
F4
SAR3
E4
IRIN
C4
GPIO44
AC11
GPIO96
D9
GPIO88
D10
GPIO90/I2S_OUT_MUTE
D7
GPIO91
E11
GPIO97
E8
GPIO98
E10
GPIO99
D6
GPIO103/I2S_OUT_SD3
D5
GPIO102
C5
XIN
B3
XOUT
A3
TESTPIN/GND
E6
SPI_DI
AE11
SPI_DO
AF12
/SPI_CS
AE12
SPI_CK
AD11
USB_DP_1
B5
USB_DM_1
A5
USB_DM_2
AC10
USB_DP_2
AB10
GPIO_PM0/GPIO134
E5
GPIO_PM1/GPIO135
F5
GPIO_PM2/GPIO136
G5
GPIO_PM3/GPIO137
H5
GPIO_PM4/GPIO138
F6
GPIO_PM5/INT1/GPIO139
G6
GPIO_PM6/INT2/GPIO140
H6
GPIO131/LDE/SPI_WPn1
AC17
GPIO130/LCK
AB17
GPIO132/LHSYNC/SPI_WPn
AF11
GPIO60/PCM2_RESET/RX1
AA18
GPIO62/PCM2_CD_N/TX1
AA17
LHSYNC2/I2S_OUT_MUTE/RX1
E7
LVSYNC/GPIO133
AC18
GPIO79/LVSYNC2/TX1
C6
UART2_RX/GPIO84
F9
UART2_TX/GPIO85
F10
UART1_RX/GPIO86
A6
UART1_TX/GPIO87
B6
GPIO42/PCM2_CE_N
AF5
GPIO43/PCM2_IRQA_N
AF10
TS0_D0
AA8
TS0_D1
Y8
TS0_D2
Y9
TS0_D3
AB7
TS0_D4
AA6
TS0_D5
AB6
TS0_D6
U4
TS0_D7
AC5
TS0_SYNC
AC4
TS0_VLD
AD5
TS0_CLK
AB4
TS1_D0
AB19
TS1_SYNC
AA20
TS1_VLD
AC19
TS1_CLK
AA19
ET_TXD0
C10
ET_TXD1
B11
ET_TX_CLK
A9
ET_RXD0
C11
ET_RXD1
C9
ET_TX_EN
B10
ET_MDC
A10
ET_MDIO
B9
ET_COL
A11
GPIO67
A7
GPIO68
B8
IC1500
KIA7042AF
2
G
3
O
1
I
R1545
100
R1508 1.8K
19~22
R109
4.7K
R1606
3.3K
LED_MOVING
R1610
OPT
R1604
3.3K
HD
R1608
3.3K
NO_FRC/LVDS_A
R110
22
R113
22
R1536
0
R165
0
R164
0
R163
0
R162
0
R1535
0
C107
8pF
OPT
C108
8pF
OPT
EEPROM
REAR_USB
Serial FLASH MEMORY
for BOOT
I2C
NAND FLASH MEMORY
10 : BOOT 51
11 : BOOT RISC
MCU BOOT STRAP
/PF_CE0
H : Serial Flash
L : NAND Flash
/PF_CE1
H : 16 bit
L : 8 bit
Addr:10101--
HDCP EEPROM
IC105: EAN43352801(ATMEL SHRINK)
PM GPIO Assignment Recommended by MStar
1386 WON
$0.76
$0.418
$0.199
VOLTAGE DETECTOR
*Mstar reset:Active high reset
SIDE_USB
0IMMRMP008A(MICROCHIP)
POWER DETECT
MODEL OPTION
080923_Time Delay
DIMMING
MODEL_OPT_1
LOW
MODEL_OPT_2
PIN NAME
PDP
HD
MODEL OPTION
MODEL_OPT_0
E11
PIN NO.
MODEL_OPT_3
HIGH
FRC
LCD
NO_FRC
D7
LED_NORMAL
LED_MOVING
B9
D6
FHD
LVDS_A
LVDS_B
B9(FHD)
B9(HD)
SCHEMATIC DIAGRAM
MAIN 1
Click on the first or last page to see other 42LH3000 / 42LH3010 / 42LH3020 / 42LH3040 (CHASSIS:LD91A) service manuals if exist.