LG 55LH40 / 55LH41 / 55LH400С (CHASSIS:LA92B) Service Manual ▷ View online
- 29 -
C
2009
4. Speaker
Check the output (Pin A8,B7,C7,D8) of LGE3159(IC100).
Measure waveform at R160,R161,R162,R163
because it’s more easy to check.
because it’s more easy to check.
Can you see the normal signal?
Check the input (Pin 7,17,18,19) of NTP3100((IC600).
Can you see the normal waveform?
Can you see the normal waveform?
YES
NO
NO
This board has big problem because
Main chip(BCM3553) have some troubles.
After checking thoroughly all path once again,
Main chip(BCM3553) have some troubles.
After checking thoroughly all path once again,
You should decide to replace BCM3553 or not
After checking audio signal line,
yo u should decide to replace item or not.
YES
NO
After checking the Power & I2C & Reset of this chip,
you should decide to replace this or not
NO
YES
After checking audio signal line,
you should decide to replace item or not.
you should decide to replace item or not.
Check the connector & Speaker
Check the Output (Pin Audio_MASTER_CLK ,MS_LRCK
MS_SCK,MS_LRCH) of LGE3159(IC100).
Can you see the normal waveform?
MS_SCK,MS_LRCH) of LGE3159(IC100).
Can you see the normal waveform?
Check IC600(NTP-3100L) L606/L607
YES
- 30 -
C
2009
5. SPDIF
Check the output (Pin E9) of LGE3159(IC100).
Measure waveform at R159 because it’s more easy to check.
Can you see the normal signal?
Measure waveform at R159 because it’s more easy to check.
Can you see the normal signal?
Check the input of JK601.
Can you see the normal waveform?
Can you see the normal waveform?
YES
NO
NO
This board has big problem because
Main chip(LGE3159) have some troubles.
After checking thoroughly all path once again,
Main chip(LGE3159) have some troubles.
After checking thoroughly all path once again,
You should decide to replace LGE3159 or not
After checking audio signal line,
yo u should decide to replace item or not.
yo u should decide to replace item or not.
YES
After checking the Jack, you should decide to replace item or not.
C
2009
- 31 -
BLOCK DIAGRAM
SIDE
SIDE
JA
C
K
P
A
C
K
JA
C
K
P
A
C
K
D-sub RGB
HDMI 1
Side
A
V
CV
BS
,
L
/R
DDR2 (5
12Mb
it
)
Qimonda
/
Hy
nix
NAND Flash
(256Mb)
Digita
l
A
udio (Optic
)
Digita
l AMP
NT
P3100L
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 US)
(ATSC US)
LGE3159
MPEG2
L
inux
Scal
er
He
adphone
Dat
a
[
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
HDMI4
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
R
X
/TX
RE
A
R
RE
A
R
JA
C
K
P
A
C
K
JA
C
K
P
A
C
K
SCL
,
SDA
_3
.3
V
T
R
B
uffer
VS
B
D
e
m
od.
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
12Mb
it
)
Qimonda
/
Hy
nix
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
Module
(FHD+120Hz)
(F
H
D
+
T
ru
m
o
tion240
H
z
)
FRC IC
(LGE7329)
DDR2
Qimonda/Hy
nix
FRC Block
FRC Block
LV
D
S
LCD
Module
(FHD,
6
0Hz)
Option
HDMI 3
HDMI S/W
L
RCK
LR
CH
Mas
te
r
CLK
C
2009
- 32 -
I2C Map
+3.3V
NTP3100L
IR(Ey
e
-Q)
+5V_GENERAL
LG
E7329
(FRC)
LGDT3305
SDA_0, SCL_0
MEMC_SD
A
, M
EMC_SC
L
SDA_1, SCL_1
SD
A
_
S
UB/
A
M
P,
SCL_
SUB/
A
M
P
FE
_DEM
OD
_SD
A
,
F
E
_DEM
OD
_
S
CL
+5V_GENERAL
TUNER
FE_
TUNER_SDA,
FE_
TUNER_SCL
+5V_TU
OPTIO
N
AT24C512
EEPROM_SDA,
EEPROM_SCL
+3.3V
LG
E315
9
ISP_RXD,
ISP_T
XD
+5V_ST
TDA9996H
L
T
D
A
9996_S
D
A
, T
D
A
9996_S
CL
CAT24WC08
HDCP
HDMI_SDA,
HDMI_SCL
+3.3V_
HD
MI
S
aturn
5
I
S
P D
e
bug
Port
TDA9996H
L
I2C Map
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