LG 52LG65YD-AC (CHASSIS:LB81C) Service Manual ▷ View online
- 21 -
C
2008
6. HDMI doesn’t display
Check input connect J900 , J901, J902
Can you see the normal waveform?
Check DDC communication lines(IC900,
IC901, IC903 Pin5,6)
Check the input of HDMI Seitch(IC902)
This signal is TMDS.
Can you see the normal waveform?
YES
YES
NO
J900 , J901, J902
may have problem. Replace this Jack.
Check the output of HDMI Switch(IC902).
Can you see the normal waveform?
YES
YES
NO
After checking the trace of TMDS lines and power of
HDMI Switch, you should decide to replace HDMI
Switch or not.
NO
NO
After checking the Power of this chip, you
should decide to replace this or not.
After checking the Power of HDMI Switch you
should decide to replace MST3361 or not.
YES
Check HDCP communication lines(IC902)
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.
C
2008
- 22 -
BLOCK DIAGRAM
Side Y/C
Rear CV
BS
CVBS_Out
IN1
IN3
IN1
IN3
OUT
1
Side CVBS
AN
T
D
V
B
/P
A
L T
une
r
(TDVS-H7
0
2
P)
LG I
nnot
e
k
M-ST
AR
(M
S
T
2379
A
/LGE7363
C
)
D-AMP
(Y
D
A
138)
0I
P
R
P
T
I030
B
H
ead
Phone
LVDS(8Bit)
X-T
A
L
1
2
Mhz
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
A
ir
:
D
VB/
PAL
ïRG
B
/YP
b
Yr*
2
ïC
VB
S*
2
ïYC
*1
ïL
/R-IN*
3
ïS
IF
ïC
VB
S O
U
T*
1
R OUT
L OUT
0
IM
M
R
00141
A
HeadPhone
PC(VG
A
)
RS232
C(Debu
g)
L
C
D
USB(SW Upgrade)
C
VBS0P
SIF
_
IN1
P
SCL_D_T
U
SD
A_D
_T
U
TU
_
T
S
_
C
L
K
T
U
_
T
S_SY
N
C
TU
_
T
S
_
V
A
L
TS1_CLK
TS1_SY
NC
TS1_VLD
IN[A2
]OUT[
A1]
2
3.
3
V
1.
8
V
H
P_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]
H
P_D
ET[37]
MUTE
[6]
AU
OU
T
R
0[80]
AU
OU
T
L
0[79
]
GP
IO
12[45
]
LVD
S[177-
190,
194-
199]
RXE
/RX
O
BIN[1
]S
O
G
IN[2
]GIN[3
]R
IN[4]
VS_RGB
[7]
HS_
RGB[8
]
SC
L/RX
[33]
SD
A/
T
X
[34
]
DM
_
D
ET
[
PB_IN[11
]
SOY
[13
]
Y
_
IN[14]
PR_IN[16]
AU
L_IN1[70]
AUR
_IN
1[71]
C
VBS1[30]
AU
L_IN0[68]
AU
R_IN[69]
SV_C0[25]
SV_Y
0[26]
GP
IO
15[48
]
6612F0009
9A
$0.27617
EA
G31022001
$0.185
Tx/
Rx
(I
C
603
)
MA
X3
2
3
2
C
DR
Tx
_
O
u
t
Rx
_
In
R
232
C
_
T
X
D
R2
3
2
C_
R
X
D
EEPR
OM
AT
24C028N
DD
C_
S
D
A
/UA
RT
_T
x
DD
C_
S
C
L
/UA
RT
_
R
x
IR
_RX
[57]
S
A
R
0
[201]
S
A
R
1
[202]
S
A
R
2
[203]
S
A
R
3
[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]
SP
I_DI[172]
SP
I_DO[173]
SP
I_CZ[174]
E
A
N32213401
3.3
V
KEY
_CT
L[1
,2,3
]
M
P
15
93
DN-
L
F
0IP
M
G00
063A
$0.46
12V
5V
Po
w
e
r/LIP
S
Po
w
e
r/LIP
S
20îB
CM : $20
23îB
CM : $18
20îB
B3 : $12
23îB
B3 : $18
Po
w
e
r
C
hanged
32K
512K
TU
_
T
S
_
D
A
TA
[0
]
2.
5
V
TS1_D
0
SCL_A_T
U
SD
A_A_
T
U
Video SW
(I
C
500,
STMA
V340)
Comp_1
YPbPr
Comp_2
YPbPr
Comp_Y
Comp_Pb
Comp_Pr
3
3
HY
5D
U5
61
6
2
2
(DDR)
HY
5D
U5
61
6
2
2
(DDR)
2.
5
_DDR
HY
5D
U5
61
6
2
2
(DDR)
HY
5D
U5
61
6
2
2
(DDR)
- 23 -
C
2008
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
D
V
B
/P
A
L T
une
r
(TDVS-H7
0
2
P)
LG I
nnot
e
k
M-ST
AR
(M
S
T
2379
A
/LGE7363
C
)
$4.66
D-AMP
(N
T
P
3000
)
0I
P
R
P
T
I030
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
C
a
b
le :
256
/64QA
M
ïRG
B
/YP
b
Yr*
2
ïC
VB
S*
3
ïYC
*2
ïL
/R-IN*
3
ïS
IF
ïC
VB
S O
U
T*
1
R OUT
L OUT
HeadPhone
PC Ea
rPhone
PC(VG
A
)
RS232
C(Debu
g)
PC IN
L
C
D
USB(SW Upgrade)
1.
8
V
p-p
1.
0
V
p-p
96d
BuV
C
VBS0
[31]
Bu
ffer
SIF
_
IN1
P
SIF
_
IN1
M
SIF
_
IN1
P
S
IFP0
[51]
Bu
ffer
[11]
TS0-
7[96,97
,98,99
,100,101,102,103]
SC
L[48]
SC
L[49]
MS
CL
MS
DA
SCLM
1[59]
SD
AM
1[60]
TPC
LK[46]
T
P
SO
P[
4
4
]
TPVAL
ID[43
]
nTP
E
RR[4
1
]
TSCLK[95]
TSSY
N
C
[105]
TSVAL
ID
[104]
IN[256]
OUT[255]
2
3.
3
V
1.
8
V
H
P_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]
H
P_D
ET[37]
MUTE
[6]
12
V
AU
OU
T
R
0[80]
AU
OU
T
L
0[79
]
GP
IO
12[45
]
LVD
S[177-
190,
194-
199]
RXE
/RX
O
BIN[1
]S
O
G
IN[2
]GIN[3
]R
IN[4]
VS_RGB
[7]
HS_
RGB[8
]
SC
L/RX
[33]
SD
A/
T
X
[34
]
DM
_
D
ET
[
AUR
_IN
3[76]
AU
L_IN3[75]
PB_IN[11
]
SOY
[13
]
Y
_
IN[14]
PR_IN[16]
AU
L_IN1[70]
AUR
_IN
1[71]
C
VBS1[30]
AU
L_IN0[68]
AU
R_IN[69]
SV_C0[25]
SV_Y
0[26]
GP
IO
15[48
]
6630G70016A
$0.23975
6630G70017A
$0.21984
6612F0009
9A
$0.27617
6612F0009
9A
$0.27617
EA
G31022001
$0.185
6612J1
0031A
$0.25744
Tx/
Rx
(I
C
L
3232
)
0IPRP00009A
0IM
X
2321
62A
$0.32
$0.4
ST-5V
Tx
_
O
u
t
Rx
_
In
R
232
C
_
T
x
R
232
C
_
Rx
EEPR
OM
0IMMR00014A
$0.076
DD
C_
S
D
A
DD
C_
S
C
L
IR
_RX
[57]
S
A
R
0
[201]
S
A
R
1
[202]
S
A
R
2
[203]
S
A
R
3
[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
T
25V
F
0
1
6
B
Flash(16
M
)
SS
T
25V
F
0
1
6
B
S
P
I_CK
[171]
SP
I_DI[172]
SP
I_DO[173]
SP
I_CZ[174]
E
A
N32213401
$0.67
3.3
V
KEY
_CT
L[1
,2,3
]
M
P
15
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
w
e
r
C
hanged
32K
512K
SI
F
HY
5D
U5
61
6
2
2
(DDR)
HY
5D
U5
61
6
2
2
(DDR)
2.
5
_DDR
HY
5D
U5
61
6
2
2
(DDR)
HY
5D
U5
61
6
2
2
(DDR)
- 24 -
C
2008
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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