LG 19LV2300 (CHASSIS:LA86D) Service Manual ▷ View online
- 29 -
Check the output (Pin AL25,AJ25,AK25) of
BCM355x(IC100).
Measure waveform at R2636,R2637,R2635 because
it
’s more easy to check.
Can you see the normal signal? Refer to figure 1
Check the input (Pin 17,18,19) of NTP3000
((IC501). Can you see the normal waveform?
Refer to figure 1
Check the speaker output wafer P501.
Can you see the normal waveform?
Refer to figure 3
Check the connector & Speaker
Replace IC100
Speaker-Audio(Out)
YES
YES
YES
YES
Figure 1
Figure 2
Figure 3
NO
AL25 of IC100 / 17 of IC501
AK25 of IC100 / 19 of IC501
AJ25 of IC100 / 18 of IC501
Replace IC501
NO
Check the output
(Pin30,31,36,37,47,48,53,54)
of NTP3000((IC501).
Can you see the normal waveform? Refer to
figure 2
Replace IC501
NO
If P501 is damaged
replace P501
NO
- 30 -
Check the output (Pin AP11) of BCM355x(IC100).
Measure waveform at R2638 because it
’s more easy
to check.
Can you see the normal signal? Refer to figure 1
Check the input of JK500, JK501.
Can you see the normal waveform?
JK500 : PIN1_ Refer to figure 2
/JK501:PIN3_ Refer to figure 3
After checking the Jack, you should decide to
replace item or not.
Replace IC100
Spdif & Coaxial-Audio(Out)
YES
YES
Figure 1
NO
If JK500 or JK 501
are damaged replace them.
NO
Figure 2
Figure 3
- 31 -
Check the output (Pin AN28, AP29) of BCM355x
(IC100).
Measure waveform at R685, R686 because it
’s more
easy to check.
Can you see the normal signal? Refer to figure 1
Check the input of JK704.
Can you see the normal waveform?
Refer to figure 2
After checking the Jack, you should decide to
replace item or not.
Replace IC100
Monitor out-Audio(Out)
YES
YES
Figure 1
NO
If JK704 is damaged
replace it.
NO
Figure 2
- 32 -
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
IR & Local
KEY
Buffer
Buffer
24
C16
AGC CTL (F
ro
m BCM)
USB2.
0
I2S Audio Input
VSB/
QAM/NTSC/S
IF
AV
1
AV
2
COMP
1
COMP
2
CVBS
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
AV
2
COMP
1
COMP
2
RGB
C
o
axia
l
OUT (L
G
5
0)
USB
LG70: FHD-1
20
Hz
X400
X-tal(24
)
NVRAM
24
C512
EE
PRO
M
EE
PRO
M
EE
PRO
M
MT8280-
FG
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-ta
l(2
7
)
HDMI4
TMD
S
141H
AR
(1x1,
Equali
zer)
EE
PRO
M
Du
al
HDMI
Rx1
HDMI CEC(To
M
ico
m)
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