LG 42PB4D-AA (CHASSIS:PB73B) Service Manual ▷ View online
- 17 -
EXT
1/2
X260
TP A
Comp1/2
RGB
CVBS
TP C
TP B / 656
AT/NT/
TUNER
TP
MST
3367
HS,VS
DVI
HS,VS
YCbCr2
YCbCr
or RGB
FRC9445H
RGB
CVBS
YCbCr1
DVO
Y/C1, Y/C2
Y/C1, Y/C2
AV1/2
AV1/2
HDMI
1/2/3
TMDS341A
1. Video
(7) Component/RGB
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5 : _Check the MST3361(IC402) Output Signals
(Vsync
) :
(DE) :
(C
lk
) :
(Hsync
)
59.94Hz
Frequency : Different according to
format !!
(Data) :
4 : _Check MST3361(IC402) Power pins, Input Signals, Signal Shape is Same (above)
6 : _Check X260 (IC101) Inputs
_Signal shape is same (above)
Check Signal format
(supported format?)
Check STMAV335(IC403) Power
Pins, Comp1(#2,#5,#11),
Comp2(#3,#6,#10), RGB(#9,#4,#7)
RGB_V,H(R400,R401)
Check STMAV335(IC403)
outputs
#14(MUX_OUT_Y),
#13(MUX_OUT_Pb),
#8(MUX_OUT_Pr)
Check MST3361(IC402)
OSC, Power pins,#44( Y_in),
#41(Cb_in),#46(Cr_in)
#37(H),#38(V)
1
2
3
Check MST3361(IC402) Outputs V-
out (#99) , H-out (#98) , Clock (#96) ,
Data (30Bit) , DE(#97)
Check X260 (IC101) Inputs
MST3361_HS(#T6) ,
MST3361_VS(#T5) , Clock (#P3) ,
Data (30Bit) , DE(#U6)
4
5
6
3 : Check STMAV335(IC403)
outputs
Signal shape is same (above)
1. Check Signal format (ref.
owenr
’s
manual)
2. Check STMAV335(IC403) Power Input Signal
1. Video
(8) Component/RGB
- 19 -
EXT
1/2
X260
TP A
Comp1/2
RGB
HDMI
1/2/3
CVBS
TP C
TP B / 656
AT/NT/
TUNER
TP
MST
3367
HS,VS
DVI
HS,VS
YCbCr2
YCbCr
or RGB
FRC9445H
RGB
CVBS
YCbCr1
DVO
Y/C1, Y/C2
Y/C1, Y/C2
AV1/2
AV1/2
TMDS341A
1. Video
(9) HDMI/DVI
- 20 -
1 : _Check HDCP Error
_Retry power off and on (TV or STB/DVD
…)
_Check MST3361(IC402) HDCP IIC line (#69,#70)
2 : _Check EDID Download
(RX0C-,RX0C+) :
Frequency : Different according to
format !!
4 : _Check MST3361(IC402) Outputs
SCL :
SDA :
3 : _ MST3361(IC402) inputs
(RX1C-,RX1C+) :
(Vsync
) :
(DE) :
(C
lk
) :
(Hsync
)
59.94Hz
Frequency : Different according to
format !!
(Data) :
5 : _Check X260 (IC101) Inputs
_Signal shape is same (above)
Snow noise (White dot) ?
Power off and on
(TV or STB/DVD
…)
Video is normal & No Sound ?
Check HDCP Power Pin(IC404),
MST3361(IC402)
IIC(#69,#70)
Check MST3361(IC402) inputs
Power,
Osc
#25,#26(RX1C-,RX1C+),
#14,#15(RX0C-,RX0C+)
Re-download EDID(IC406/407/408)
Check MST3361(IC402) Outputs
V-out (#99) , H-out (#98) ,
Clock (#96) , Data
1
2
3
4
N
Y
N
Y
Y
Check X260 (IC101) Inputs
MST3361_HS(#T6) ,
MST3361_VS(#T5) , Clock (#P3) ,
Data (30Bit) , DE(#U6)
5
1. Video
(10) HDMI/DVI
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