LG 47LF11 (CHASSIS:LA92G) Service Manual ▷ View online
- 25 -
C
2009
11. No Video(for 42/47LH40-UA)
Check 12V DC Voltage
- L1300
NO
Check Q706
- pin4 2V DC voltage
NO
Check PANEL_CTRL
- LOW(0V)
OK
OK
OK
Replace Q706
Check Q704/Q705
Check 3.3V/16V/26V DC Voltage
-R1447,R1446,R1450
NO
Replace IC1300
or Main borad
OK
Check IC1301 pin 28(Vcom)
- about 7V
NO
Detach the P1400/P1401
FFC Cable
- Check Vcom
NO
Replace IC1301
OK
OK
Replace LCD Module
Check URSA2 mini-LVDS output
P1400, P1401
NO
Replace LCD Module
12. No Video(for 37LH40-UA)
Check 12V DC Voltage
- L1300
NO
Check Q706
- pin4 2V DC voltage
NO
Check PANEL_CTRL
- LOW(0V)
OK
OK
OK
Replace Q706
Check Q704/Q705
Check 3.3V/16V/26V DC Voltage
-R1327,R1371,R1378
NO
Replace IC1300
or Main borad
OK
Check IC1301 pin 28(Vcom)
- about 7V
NO
Check IC1302
input / output
NO
Replace IC1302
OK
Detach the P1400/P1401
FFC Cable
- Check Vcom
OK
OK
Check URSA2 mini-LVDS output
P1400, P1401
NO
Replace LCD Module
C
2009
- 26 -
BLOCK DIAGRAM
D-sub RGB
HDMI 1
Side A
V
CV
BS
, L
/R
DDR2 (5
12Mbit)
Qimonda
/ Hynix
NAND Flash
(256Mb)
Digita
l A
udio
(Optic
)
Digita
l AMP
NT
P3000A
RS-232C (Ctrl./SVC)
I2S
EEPROM
512Kb
RGB/
H/V
Half-NIM Tuner
DD
R_Data[
0:
15]
, D
Q
S,
DM
Ad
dr.[ ]
, ctrl. data
MAX3
232
Saturn5
Saturn5
(ATSC
(ATSC
US)
US)
MPEG2
L
inux
Scal
er
Headphone
D
a
ta [0
7]
IF
+/-
SIF
TU_CVBS
R
e
set / IF
_AGC
SDA
/SCL_
5V
JT
A
G
C
L
K,T
D
I,T
D
O
,M
S,
R
S
T
HDMI3
Ad
dr[0
1], C
S
Au
d
io L/R
A
u
dio L/R (for
RGB)
HDMI 2
SP
DI
F
RX
/T
X
RX
/T
X
J
A
CK
P
A
CK
J
A
CK
P
A
CK
at RE
A
R
at RE
A
R
J
A
CK
P
A
CK
J
A
CK
P
A
CK
at SIDE
at SIDE
SCL
, SDA
_3
.3
V
T
R
B
u
ffer
VSB
Demod.
X-t
al
Res
et
S
w
itch
Reset IC
12MH
z
T
S
In[0
7]
TS_
cl
k, SOP, Va
l
EEPR
OM
Data[1
6:31]
DDR2 (5
12Mbit)
AV
Component 1
Y
Pb
Pr, L/R
CV
BS
, Y/
C,
L
/R
Component 2
Y
Pb
Pr, L/R
Digital A
udio
(Coaxial)
USB2.0
SCL
, SDA
_3
.3
V
B
lu
e
tooth
Do
ngl
e
(Option)
DP
/D
M
DP
/D
M
O.C. Protector
+5V
+5V
LCD Mod
u
le
(FHD, 120
Hz)
FRC IC
(MST
7327)
DDR2
Qimonda/Hy
nix
FRC Block
FRC Block
T
T
-
-
c
on b
loc
k
c
on b
loc
k
LV
D
S
LCD Module
(FHD, 60
Hz)
Option
HDMI 3
HDMI S/W
Mini-LVDS
P-Gamm
a
V-Com
IIC
Qimonda
/ Hynix
C
2009
- 27 -
+5
V
_
G
E
NE
R
A
L
M
S
T
7323
(URS
A
1
)
L
G
DT3305
SDA_
0
SCL_0
SDA_
1
SCL_1
FE
_DEM
OD
_SD
A
FE
_DEM
OD
_SC
L
FE
_TUN
ER
_
S
DA
FE
_TUN
ER
_
S
CL
(SDA
_
3
SC
L_3 )
EE
PROM_SDA
EE
PROM_SCL
(SDA
_
2
SC
L_2 )
Msta
r
22 o
h
m
0 o
h
m
4.7
K
o
h
m
MEMC_SD
A
MEMC_SCL
0 o
h
m
22 o
h
m
+3
.3
V
N
T
P
3100
L
T
D
A
9996
T
D
A
9996_S
D
A
T
D
A
9996_S
CL
0 o
h
m
0 o
h
m
4.7
K
o
h
m
S
D
A_
S
U
B
/AM
P
SCL_SUB/
A
M
P
0 o
h
m
100 o
h
m
+
3
.3
V_H
D
M
I_ST
OPT
T
D
V
-H
101F
22 o
h
m
22 o
h
m
4.7
K
o
h
m
+5
V
_
TU
+5
V
_
G
e
n
e
ra
l
4.7
K
o
h
m
A
T
24C512
33 o
h
m
22 o
h
m
4.7
K
o
h
m
+
3
.3
V
+
5V_Ge
n
eral
OPT
33 o
h
m
3.3
K
o
h
m
+3
.3
V
33 o
h
m
33 o
h
m
33 o
h
m
33
oh
m
33 o
h
m
33 o
h
m
+
3
.3
V_S
T
3.3
K
o
h
m
IR
0 o
h
m
M
S
T
7327
(URS
A
2
)
IIC Map
- 28 -
C
2009
M
S
T
7327
N
T
P
S65162
FFC Cabl
e
RI
GHT
FRC_L
VDS
OUTPUT
+3.3V
_FRC
+1.2
6
V
_FRC
+1.8V
_FRC
12
M
h
z
FRC_SD
A
FRC_SCL
SD
A
0
SCL0
FRC_ODT
EEPRO
M
FRC_RES
E
T
FRC_MCLK
FRC_MCLKZ
WP_EEPRO
M
_
F
R
C
OPT_P
OPT_N
GOE
GSC
GSP_R
GSP
SO
E
PO
L
H_CO
N
V
LED
_LCM_FRC
VLCD
_LCM (
1
2
V)
V
D
D
_
L
C
M
(
16
V)
VG
L (
-5
V
)
VG
H
VG
H
M
DPM
FLK
VCOMROUT
P_
V
C
O
M
VCO
M_FB
VLCD
_LCM_
OUT ( 1
2
V)
VCC_LCM (
3.
3
V
)
VCO
MLO
U
T
P_
V
C
O
M
P_G
am
m
a
FFC Cabl
e
LEFT
VDD_LCM_P
G
VG
H_
M
( +24V)
VCO
MR_OP
VCO
ML_
O
P
DPM
SO
E_L
SO
E_
R
LTD_R
/L
LED
GM
A
1
~
1
8
Mi
n
i LVD
S
O
U
T
URSA
2
T-Con block (non GIP)
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