LG 32LG40 (CHASSIS:LA89A) Service Manual ▷ View online
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Yes
3. Component doesn’t display.
Check JK700.
Can you see the normal waveform?
Check the input(Comp_Y:C638, Comp1_Pr:C639,
Comp1_Pb:C640) of BCM355x (IC100).
Especially you should check the H,V sync and clock.
Can you see the normal waveform?
JK700 may have problem.
Replace this Jack.
No
This board has big problem because Main chip
(BCM355x) have some troubles.
After checking thoroughly all path once again,
You should decide to replace BCM355x or not.
No
Yes
4. RGB_PC doesn’t display.
Check JK705.
Can you see the normal waveform?
Check the input and output of BCM355x (IC100).
Especially you should check the H,V sync and clock.
Can you see the normal waveform?
JK705 may have problem.
Replace this Jack.
No
This board has big problem because Main chip
(BCM355x) have some troubles.
After checking thoroughly all path once again,
You should decide to replace BCM355x or not.
No
Check DDC communication lines.(IC601,IC602, IC701)
Yes
Check the input and output of BCM355x(IC100).
Especially you should check the H,V sync and clock.
Can you see the normal waveform?
After checking the Power of th chip, you should
decide to replace this or not.
No
Check the input connect JK600, JK601, JK702.
Can you see the normal waveform?
Yes
JK600, JK601, JK702 may have problem
Replace this Jack.
No
Check HDCP communication lines. (IC102)
Yes
After checking the Power of th chip, you should
decide to replace this or not.
No
This board has big problem because Main chip
(BCM355x) have some troubles.
After checking thoroughly all path once again,
You should decide to replace BCM355x or not.
No
5. HDMI doesn’t display.
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Check the connection P901 between main B/D and
DSS-863 DVD Loader.
Yes
Check Pin 8(DVDP_Y input), Pin 7(DVDP_Pb input)
and Pin 6(DVDP_Pr input) of P904 wafer.
Can you see the normal waveform?
Fix the 6 pin cable well on the P901 and the
connection wafer of DSS-863 DVD Loader
No
Check the connection P900 between main B/D and
DSS-863 DVD Loader.
Yes
Fix the 4 pin cable well on the P900 and the
connection wafer of DSS-863 DVD Loader
No
Check the connection P904 between main B/D and
DSS-863 DVD Loader.
Yes
Check the input(DVDP_Y:C628, DVDP_Pr:C29,
DVDP_Pb:C630) of BCM355x(IC100).
Especially you should check the H, V sysnc and clock.
Can you see the normal waveform?
Yes
Yes
Fix the 6 pin cable well on the P904 and the
connection wafer of DSS-863 DVD Loader
No
Check the soldering condition of P904.
It may be occurred in the DSS-863 DVD Loader.
You can change other DSS-863 DVD Loader and
check again.
Yes
If the changed DSS-863 loader is operated well,
before DSS-863 loader have the problem itself.
You might change the new DSS-863 DVD Loader.
Yes
If the changed DSS-863 loader is operated well,
before DSS-863 loader have the problem itself.
You might change the new DSS-863 DVD Loader.
No
No
5. DVD doesn’t display.
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BLOCK DIAGRAM
Flash
(16MB)
DDR(128MB)
(16x16x4)
74LVC14APW
CS5345
Audio S/W
AMP, A/D
MTV416
(Micom
)
NTP3000
(Digital AMP)
X-tal(54M)
PI3HDMI341
(3x1,S/W)
EEPROM
AT/NT
Tuner
64Bit I/F
Reset
CVBS
CVBS/Y/C
Y/
Cb
/C
r
R/G/B
H/V Sync
RGB-PC
HDMI
1/2
COMP 1
RGB-PC
Audio L/R
SPDIF OUT
I2S
RS-232C
Dead IC when Standby
Option
Alive IC when Standby
Video
Audio
Video
Front
End
Dual
HDMI
Rx
HD/SD
Video
Encoder
Audio
DSP
BCM3552
BCM3552
MCLK
HDMI CEC
HDMI CEC
(To MICOM)
T
o
Micom
SDA
SCL
SIF
IF(AT)
Buffer
Single LVDS
Connector
Digital out
WXGA(768P)
Local KEY
IR
Buffer
Buffer
24C16
AGC CTL (From BCM)
USB2.0
I2S Audio Input
VSB/QAM/NTSC/SIF
DVDP
DVDP
Side
AV
Side
AV
AV1
COM
P
Side HDMI
Port1
Port2
MCLK
CLK, DATA
- 20 -
Comp_Y
H / V Sync
BCM3552
BCM3552
Comp_Pb
Comp_Pr
Component
Input
DVDP input
RGB Input
RGB H/V Sync
Side AV
CVBS
CVBS 3
ANT/ Cable
TUNER
IF_P
IF_N
IF_P from TUNER for DTV
IF_N from TUNER for DTV
CVBS 1
EEPROM
FOR EDID
DDC SDA
DDC SCL
LVDS_Tx
Out
Component S/W
DVDP S/W
RGB S/W
GPIO[0:6]
DVDP_Y
DVDP_Pb
DVDP_Pr
RGB_R / G / B
DDC SCL to
Micom
for Download
LPF 30Mhz
LPF 30Mhz
LPF 30Mhz
LPF 30Mhz
LPF 30Mhz
LPF 30Mhz
LPF 6
M
hz
DDC SDA to
M
ic
o
m
for Download
Side_CVBS
_
S
/W
Composite1 S/W
S-VIDEO S/W
S-VIDEO1_C / L
COMPOSITE1_IN
Composite
Input
Single LVDS
Connector
Digital out
WXGA(768P)
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