LG 42LG60 (CHASSIS:LA84B) Service Manual ▷ View online
- 29 -
C
2008
Check th
e o
u
tput (Pin
A
P
11
) o
f BCM3553(
IC100).
Measu
re w
a
v
e
fo
rm at R263
8
b
ecau
se it
s more easy
to
check.
Can y
ou see t
h
e n
o
rmal sign
al?
Check th
e in
pu
t o
f JK500, JK501.
Can y
ou see t
h
e n
o
rmal
w
a
v
e
form?
YES
NO
NO
This board ha
s big
problem
because Main chip(BCM3553) ha
v
e
some troubles.
A
ft
e
r ch
ec
kin
g th
orou
ghly
all p
a
th
once ag
ain
, You
sho
uld d
ecid
e
to rep
lace BCM
3553 o
r n
o
t.
A
ft
e
r checking audio signal line, y
o
u sh
ould decide
to
replace item or not.
YES
A
ft
e
r checking the Jack, y
o
u should
decide to replace item or not.
Spdif&Coaxial
- 30 -
C
2008
Check the output (Pin AN
28,
AP29) of BCM3553(IC100).
Measure
wavef
orm at R685, R
686 beca
use its
more eas
y
to
check.
Can y
o
u see the normal signal?
NO
This board has big problem because Ma
in
chip(BCM3553) have some t
roubles.
After checking
thoroughly
all path once again
, You should
decide
to
repla
ce
BCM3553 or n
o
t.
Check the input of JK704.
Can y
o
u se
e the nor
mal
w
ave
for
m?
YES
NO
After ch
ecking
audio s
ignal lin
e,
you
s
h
ou
ld d
ecide to
r
eplace
item
or n
o
t.
YES
After ch
eck
ing
th
e Jack
,
you
s
h
ou
ld d
ecid
e to
rep
lace
item
or
not.
MNT OUT
C
2008
- 31 -
BLOCK DIAGRAM
Flash
(1
6MB)
DDR(
3
2
MB)
(4x16x
4
)
DDR(
3
2
MB)
(4x16x
4
)
74LVC14APW
C
S
5345
(Audio S/W
&A/D&)
MTV416
(Micom)
NTP
3
0
0
0
(D-AMP)
X200
X-tal(54
)
PI
3HDMI
3
4
1
ATR
(3x1,S/W
)
EEPROM
A
T
/NT Tune
r
64Bit I/F
R
eset
CVBS
CVBS/Y/C
Y/Cb/Cr
R/G/B
H/V Sy
nc
Audio L/R
I2S
MNT out
(L/R)
SPDIF
OUT
I2S
Dual LVDS
Connector(40P)
Full H
D
(1080
P)
RS-232
C
Dead IC
w
h
e
n
Standby
A
li
v
e IC
w
h
en
Standby
Video
Fro
nt
End
Du
al
HDMI
Rx0
HD/SD
Video
Encoder
Aud
io
DSP
BCM3552(HD)
BCM3553(FHD)
MCLK
MCLK
HDMI CEC
HDMI CEC(To
M
ico
m)
To Micom
SDA
SCL
SIF
IF(AT)
Buffer
Digital out
Buffer
Buffer
24
C16
AGC CTL (F
ro
m BCM)
USB2.
0
I2S Audio Input
VSB/
QAM/NTSC/S
IF
AV
1
COMP
1
COMP
2
DDR(
3
2
MB)
(4x16x
4
)
DDR(
3
2
MB)
(4x16x
4
)
DDR(
3
2
MB)
(4x16x
4
)
DDR(
3
2
MB)
(4x16x
4
)
DDR(
3
2
MB)
(4x16x
4
)
DDR(
3
2
MB)
(4x16x
4
)
DDR (1
2
8
MB)
RGB
Y/Cb/Cr
HDMI1
HDMI2
HDMI3
AV
1
COMP
1
COMP
2
RGB
C
o
axia
l
OUT (L
G
5
0)
USB
LG60: FHD-1
20
Hz
X400
X-tal(24
)
NVRAM
24
C512
EE
PRO
M
EE
PRO
M
EE
PRO
M
FRC
-
9459M
DDR (
6
4MB)
DDR(
3
2
MB)
(4
x16x
4
)
DDR(
3
2
MB)
(4x16x
4
)
DDR(
3
2
MB)
(4
x16x
4
)
DDR(
3
2
MB)
(4x16x
4
)
Dual LVDS
Connector(26P)
X1000
X
-t
a
l(
20.25
)
HDMI4
TMD
S
141H
AR
(1x1,
Equali
zer)
EE
PRO
M
Du
al
HDMI
Rx1
HDMI CEC(To
M
ico
m)
TPA3005D2
PHPR
G
4
IR & Local
KEY
C
2008
- 32 -
EXPLODED VIEW
30
0
20
0T
80
1
40
0
90
1
90
0
54
0
82
0
53
0
58
0
81
0
12
0
50
0
12
1
56
0
51
0
80
3
80
4
57
0
84
0
52
0
52
1
83
0
80
5
80
2
20
0
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