LG 42LG61YD (CHASSIS:LB81C) Service Manual ▷ View online
- 21 -
6. HDMI doesn’t display
Check input c onnect J900 , J901, J902
Can you see t he normal wavefo rm?
Check DD C commu nication lin es(IC900,
IC901, IC903 Pin 5,6)
Check th e in pu t o f HDMI Seitch (IC902)
This sign al is TMDS.
Can you see t he normal wavefo rm?
YES
YES
NO
J900 , J90 1, J902
may have problem. Rep lace th is Jack.
Check th e output of HDMI Switc h(IC902).
Can you see t he normal wavefo rm?
YES
YES
NO
After ch eckin g th e trace o f TMDS lin es and po wer of
HDMI Switch, you should decide to replace HDMI
Switch or not .
NO
NO
After ch eckin g th e Power of th is ch ip , you
should decide to replace this or not.
After ch eckin g th e Power of HDMI Switch y ou
should decide to replace MST3361 or not.
YES
Check HD CP co mmu nicatio n lin es(IC902)
NO
After ch eckin g th e Power of th is ch ip , you
should decide to replace this or not.
Check th e output of Main IC(IC100).
Esp ecially you sh ould ch eck
The H,V sync and c loc k.
Can you see t he normal wavefo rm?
YES
NO
After ch eckin g th e Power of Main IC(IC100) you
should decide to replace Main IC or not .
This bo ard has b ig problem becau se Main
IC(IC100) have some troubles.
Afte r c hecking thoro ugh ly all pa th onc e again,
You sh ou ld decid e to rep lace Main Bo ard or no t.
- 22 -
BLOCK DIAGRAM
Side Y/C
Rear CV
BS
CVBS_Out
IN1
IN3
IN1
IN3
OUT
1
Side CVBS
AN
T
DVB
/P
A
L T
une
r
(TDVS-H7
0
2P)
LG
I
nnot
e
k
M-STA
R
(MST2379
A
/LGE7363
C)
D-AMP
(YD
A
138)
0I
PR
PTI030
B
Head
Phone
LVDS(8Bit)
X-T
A
L
1
2Mhz
6212
A
A
2
004F
TV
_CVB
S+(1.
8
V
p-p)
$0.86
Aud
io_L
Aud
io_
R
SI
F+(96d
BuV
)
IN2
Air :
D
VB/
PAL
RG
B/
Y
P
b
Yr*2
CVB
S
*2
YC
*1
L
/R-IN*3
S
IF
CVB
S
OUT*
1
R OUT
L OUT
0IMMR00141
A
Head
Phone
PC(VG
A
)
RS232C(Debu
g)
L
C
D
USB(SW Upgrade)
CVBS0P
SIF
_IN1P
SCL_D_T
U
SDA_D_T
U
TU
_
T
S_CLK
T
U
_
T
S_SYNC
TU
_
T
S_V
A
L
TS1_CLK
TS1_SY
N
C
TS1_VLD
IN[A2]
OUT[A1]
2
3.
3
V
1.
8
V
HP_OU
T
_L[42]
HP_OU
T
_R[1]
OU
T
_
P_R[8]
OU
T
_
N_
R[14]
OU
T
_
P_L[35]
OU
T
_
N_L[29]
IN_L[38]
IN_R[5]
HP_DET[37]
MUTE[6
]
AUOU
T
R
0[80]
AUOU
T
L
0[79]
GPI
O
12[45
]
LVDS[177-
190,
194-
199]
RXE
/RX
O
BIN[1]S
O
G
IN[2]
GIN[3]
R
IN[4]
VS_R
GB
[7]
HS_
RGB[8]
SCL/RX
[33]
SDA/T
X
[34]
DM_DET
[
PB_IN[11
]
SOY[13]
Y
_
IN[14]
PR_IN[16]
AUL_IN
1[70]
AUR_IN1[71]
CVBS1[30]
AUL_IN
0[68]
AU
R_IN[69]
SV_C
0[25]
SV_Y0[26]
GPI
O
15[48
]
6612F0009
9A
$0.27617
EAG31022001
$0.185
Tx/
Rx
(IC603
)
MAX323
2
C
DR
Tx_Ou
t
Rx
_In
R232
C_T
X
D
R232
C_
R
X
D
EEPR
OM
AT
24C028N
DDC_S
D
A/UART
_T
x
DD
C_S
C
L/UA
RT
_Rx
IR_RX[57]
S
A
R0[201]
S
A
R1[202]
S
A
R2[203]
S
A
R3[204]
EEPROM
(32K)
24C
32
EEPROM
(32K)
24C
32
0IMMR
A
L
0
2
5
A
ROMSCK[35]
ROMSD[36]
5V
Flash(8
M
*2)
Flash(8
M
*2)
S
P
I_CK[171]
SPI_DI[172]
SPI_DO[173]
SPI_CZ[174]
E
A
N32213401
3.3
V
KEY_CT
L[1,2,3]
MP15
93
DN-
L
F
0IP
M
G00
063A
$0.46
12V
5V
Po
w
e
r/LIP
S
Po
w
e
r/LIP
S
20B
CM : $20
23B
CM : $18
20B
B3 : $12
23B
B3 : $18
Po
wer
Changed
32K
512K
TU
_
T
S_DA
TA[0
]
2.
5
V
TS1_D
0
SCL_A_T
U
SDA_A_T
U
Video SW
(IC500,
STMA
V340
)
Comp_1
YPbPr
Comp_2
YPbPr
Comp_Y
Comp_Pb
Comp_Pr
3
3
HY
5D
U5
61
62
2
(DDR)
HY
5D
U5
61
62
2
(DDR)
2.
5
_DDR
HY
5D
U5
61
62
2
(DDR)
HY
5D
U5
61
62
2
(DDR)
- 23 -
Side A
V
_3
V,LR
Rear CV
BS_1
V, LR
Side S_3
YC
MNT_V,LR_
Out
IN1
IN3
IN1
IN3
OUT
1
Comp_1
YPbPr/LR
Comp_2
YPbPr/LR
Rear A
V
_2
V, LR
AN
T
DVB
/P
A
L T
une
r
(TDVS-H7
0
2P)
LG
I
nnot
e
k
M-STA
R
(MST2379
A
/LGE7363
C)
$4.66
D-AMP
(NTP3000
)
0I
PR
PTI030
B
LVDS(8Bit)
CLK
_
14
.3
L
6
A
F
6212
A
A
2
004F
CV
BS(A
TV)
$0.86
$0.0623
Aud
io_L
Aud
io_
R
SI
F
IN2
Comp1
Comp2
Air :
8
V
S
B
Ca
ble :
256
/64QA
M
RG
B/
Y
P
b
Yr*2
CVB
S
*3
YC
*2
L
/R-IN*3
S
IF
CVB
S
OUT*
1
R OUT
L OUT
Head
Phone
PC EarPhone
PC(VG
A
)
RS232C(Debu
g)
PC IN
L
C
D
USB(SW Upgrade)
1.
8
V
p-p
1.
0
V
p-p
96d
BuV
CVBS0[31]
Buffer
SIF
_IN1P
SIF
_IN1M
SIF
_IN1P
S
IFP0[51]
Buffer
[11]
TS0-
7[96,97
,98,99
,100,101,102,103]
SCL[48]
SCL[49]
MSCL
MSDA
SCLM1[59]
SDAM1[60]
TPCLK[46]
TPSOP[44
]
TPVALID[43]
nTPERR[41]
TSCLK[95]
TSSYNC[105]
TSVALID[104]
IN[256]
OUT[255]
2
3.
3
V
1.
8
V
HP_OU
T
_L[42]
HP_OU
T
_R[1]
OU
T
_
P_R[8]
OU
T
_
N_
R[14]
OU
T
_
P_L[35]
OU
T
_
N_L[29]
IN_L[38]
IN_R[5]
HP_DET[37]
MUTE[6
]
12
V
AUOU
T
R
0[80]
AUOU
T
L
0[79]
GPI
O
12[45
]
LVDS[177-
190,
194-
199]
RXE
/RX
O
BIN[1]S
O
G
IN[2]
GIN[3]
R
IN[4]
VS_R
GB
[7]
HS_
RGB[8]
SCL/RX
[33]
SDA/T
X
[34]
DM_DET
[
AUR_IN3[76]
AUL_IN
3[75]
PB_IN[11
]
SOY[13]
Y
_
IN[14]
PR_IN[16]
AUL_IN
1[70]
AUR_IN1[71]
CVBS1[30]
AUL_IN
0[68]
AU
R_IN[69]
SV_C
0[25]
SV_Y0[26]
GPI
O
15[48
]
6630G70016A
$0.23975
6630G70017A
$0.21984
6612F0009
9A
$0.27617
6612F0009
9A
$0.27617
EAG31022001
$0.185
6612J1
0031A
$0.25744
Tx/
Rx
(ICL
3232
)
0IPR
P00009A
0IMX
2321
62A
$0.32
$0.4
ST-5
V
Tx_Ou
t
Rx
_In
R232
C_T
x
R232
C_
Rx
EEPR
OM
0IMMR00014A
$0.076
DD
C_S
D
A
DD
C_S
C
L
IR_RX[57]
S
A
R0[201]
S
A
R1[202]
S
A
R2[203]
S
A
R3[204]
EEPROM
(32K)
24C
32
EEPROM
(32K)
24C
32
0IMMR
A
L
0
2
5
A
ROMSCK[35]
ROMSD[36]
5V
$0.145
-
$0.76
Flash(16
M
)
SS
T25V
F0
16
B
Flash(16
M
)
SS
T25V
F0
16
B
S
P
I_CK[171]
SPI_DI[172]
SPI_DO[173]
SPI_CZ[174]
E
A
N32213401
$0.67
3.3
V
KEY_CT
L[1,2,3]
MP15
93
DN-
L
F
0IP
M
G00
063A
$0.46
12V
5V
Po
w
e
r/LIP
S
Po
w
e
r/LIP
S
Po
wer
Changed
32K
512K
SI
F
HY
5D
U5
61
62
2
(DDR)
HY
5D
U5
61
62
2
(DDR)
2.
5
_DDR
HY
5D
U5
61
62
2
(DDR)
HY
5D
U5
61
62
2
(DDR)
- 24 -
MSD2379A
[M
STAR]
DDC
_I2
C
E2
PR
OM
_I
2C
E2PR
OM
EDID / IS
P
I2C M
S
CL / MS
DA
IF
_P
IF
_N
SIF
TUNER_CVB
S
IF
_AG
C
Buffer
Buffer
LP
F
TS[0-7]
TS
_CL
K
TS
_SYNC
TS
_VALID
I2C M
S
CL /
MSDA
M
A
IN I2C
CVB
S
_
0
SIF
TS
_DATA
Add sy
nc p
a
ttern of
each input/output
Add deta
il
bloc
k
di
ag
ra
m of VSB
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