LG 50PC3DD-UE (CHASSIS:PA73E) Service Manual ▷ View online
- 17 -
TROUBLESHOOTING GUIDE
RGB_PC doesn’t display
Check input connect P7004.
Can you see the normal waveform?
Check the input of Component switch(IC5002).
Can you see the normal waveform?
Check the output of Component switch(IC5002).
Can you see the normal waveform?
Check the input of MST3361(IC7004
Pin41,44,46).
Can you see the normal waveform?
YES
YES
YES
NO
P7004 may have problem. Replace this Jack.
Check the output of MST3361(IC7004 ).
Can you see the normal waveform?
YES
Check the input and output of
BCM3550(IC4006). Especially you should check
The H,V sync and clock.
Can you see the normal waveform?
YES
YES
NO
After checking the input TR of RGBHV, you should
decide to replace these components or not.
NO
NO
After checking the Power of MST3361 you should
decide to replace MST3361 or not.
NO
This board has big problem because Main
chip(BCM3550) have some troubles.
After checking thoroughly all path once again, You
should decide to replace BCM3550 or not.
After checking the Power of RGB switch you should
decide to replace component switch or not.
After checking the Power of MST3361 you should
decide to replace MST3361 or not.
- 18 -
TROUBLESHOOTING GUIDE
HDMI doesn’t display
Check input connect P7007.
Can you see the normal waveform?
Check DDC communication lines(IC7013 Pin5,6)
Check the input of MST3361(IC7004)
This signal is TMDS.
Can you see the normal waveform?
YES
YES
NO
P7007 may have problem. Replace this Jack.
Check the output of MST3361(IC7004 ).
Can you see the normal waveform?
YES
Check the input and output of
BCM3550(IC4006). Especially you should check
The H,V sync and clock.
Can you see the normal waveform?
YES
YES
NO
NO
After checking the trace of TMDS lines and power of
MST3361, you should decide to replace MST3361 or not.
NO
This board has big problem because Main
chip(BCM3550) have some troubles.
After checking thoroughly all path once again, You
should decide to replace BCM3550 or not.
After checking the Power of this chip, you should
decide to replace this or not.
After checking the Power of MST3361 you should
decide to replace MST3361 or not.
YES
Check HDCP communication lines(IC7005 Pin5,6)
NO
After checking the Power of this chip, you should
decide to replace this or not.
- 19 -
BLOCK DIAGRAM
Side AV
V,LR
Rear AV
V, LR
Rear S
YC, LR
Side S
YC, LR
MNT_V_Out
IN1
OUT1
IN4
IN1
IN4
IN5
OUT3
Comp_1
YCbCr
Comp_2
YCbCr
IN3
IN4
CVBS
CVBS
ATSC/NT
SC Tuner
Cable
ANT.
64-Bit I/F
BCM3560
12
LVDS
Trans
VDEC_CVBS/S_Y
VSB/QAM/NTSC/SIF
SPDIF Out
R/L Output
SPDIF_OUT
Flash Memory
16MByte
HDMI/DVI
RS-232C
SDRAM
256Mbit
X-tal
54MHz
Reset IC
D-class AMP
Sub
Micom
(MTV416)
Sub
Micom
(MTV416)
EEP
ROM
HDMI & Component
RGB-PC
Audio
Tuner
Comp_1
LR
Comp_2
LR
RGB(Phone)
LR
AUDIO ADC
Audio R/L
I2S
I2S Audio Input
MST3361
R/G/B
H/V Sync
DVI Input
Digital Output.
SDRAM
256Mbit x2
DDS
Data [24]
Hsync
/Vsync
/DE/
Clk
2X1
S/W
2X1
S/W
HDCP
IIC
TMDS
DDS
SPDIF
Y,C
IF P/N for DTV
SIF for NTSC
SIF for NTSC
USB for upgrade S/W
LR
MNT_Out
AUDIO DAC
IIS
TMDS
CXA2069(AV S/W)
- 20 -
BLOCK DIAGRAM
MNT_V_Out
SD_CVBS
CXA2069
OUT3
Side AV
V,LR
Rear AV
V, LR
Rear S
YC, LR
Side S
YC, LR
IN1
IN4
IN1
IN4
IN3
IN4
Comp_1
LR
Comp_2
LR
RGB(Phone)
LR
BCM3550
SD_Y
SD_C
ANT/ Cable
TV IN
CVBS from TUNER
FMS6400
Y/CVBS
C
OUT1/Y
OUT1/C
M_CVBS/Y
C
M_CVBS
C
Y
LPF for
CVBS
SD_CVBS
TUNER
IF_P
IF_N
IF_P from TUNER for DTV
IF_N from TUNER for DTV
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