LG 32LB4DS (CHASSIS:LA73A) Service Manual ▷ View online
- 17 -
EXT
1/2
X260
TP A
Comp 1/2
RGB
CVBS
TP C
TP B / 656
AT/NT/
TUNER
LGDT
3303
VSB1/QAM TP
MST
3361
HS,VS
DVI
HS,VS
YCbCr 2
YCbCr or RGB
FRC9445H
RGB
CVBS
YCbCr 1
DVO
Y/C1, Y/C2
Y/C1, Y/C2
AV1/2
AV1/2
HDMI
1/2/3
TMDS341A
Check A nten na Cable
Check Tu ner
5V, Video o ut
5V, Video o ut
Check X260 i npu ts
M_TU_CVBS(C2117)
Check CVBS Video Path
1 : _Check Tun ers Vcc and Video out
(2) VIDEO PATH
(3) RF MODE
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EXT
1/2
X260
TP A
Comp 1/2
RGB
CVBS
TP C
TP B / 656
AT/NT/
TUNER
LGDT
3303
VSB1/QAM TP
MST
3361
HS,VS
DVI
HS,VS
YCbCr 2
YCbCr or RGB
FRC9445H
RGB
CVBS
YCbCr 1
DVO
Y/C1, Y/C2
Y/C1, Y/C2
AV1/2
AV1/2
HDMI
1/2/3
TMDS341A
(4) DTV / CADTV
Check A nten na Cable
Check Tuner(TU600), 5V, IF out
Check LG DT3303(IC604) inpu ts
po wer pin s, Osc(25Mhz), IF pin
Check LG DT3303 Outputs
3._ Check X 260 Input ( CLK, SOP, Valid, Error, Data)
Check X260 I NPUT CLK, SOP,
Valid, Error, Data
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EXT
1/2
X260
TP A
Comp 1/2
RGB
CVBS
TP C
TP B / 656
AT/NT/
TUNER
LGDT
3303
VSB1/QAM TP
MST
3367
3367
HS,VS
DVI
HS,VS
YCbCr 2
YCbCr or RGB
FRC9445H
RGB
CVBS
YCbCr 1
DVO
Y/C1, Y/C2
Y/C1, Y/C2
AV1/2
AV1/2
HDMI
1/2/3
TMDS341A
5 : _Check the MST3361(IC402) Output Signals
(Vsync) :
(DE) :
(Clk) :
(Hsync)
59.94Hz
Frequenc y : Different acc ordi ng to
form at ! !
form at ! !
(Data) :
4 : _Check MS T3361(IC402) Power pins, Input Signals, Signa l Shape is S ame (abo ve)
6 : _Check X 260 (IC101) Inputs
_Signal shape is sa me (above)
Check Si gnal format
(sup port ed for mat?)
Check S TMAV335(IC403) Power
Pins, Comp1(#2,#5,#11),
Comp2(#3,#6,#10), RGB(#9,#4,#7)
RGB_V,H(R400,R401)
Check S TMAV335(IC403) outputs
#14(MUX_OUT_Y),
#13(MUX_OUT_Pb),
#8(MUX_OUT_Pr)
Check M ST3361(IC402)
OSC, Pow er pin s,#44( Y_in),
#41(Cb_in ),#46(Cr_in )
#37(H),#38(V)
1
2
3
Check M ST3361(IC402) Outputs
V-out (#99) , H-ou t (#98) , Clock
(#96) , Data (30Bit) , DE(#97)
V-out (#99) , H-ou t (#98) , Clock
(#96) , Data (30Bit) , DE(#97)
Check X260 ( IC101) Inpu ts
MST3361_HS(#T6) ,
MST3361_VS(#T5) , Clock ( #P3) ,
Data (30Bit) , DE(#U6)
4
5
6
3 : Check STMAV335(IC403) outputs
Signal shape is sa me (above)
1. Check Si gnal f ormat (ref. owenrís manua l)
2. Check STM AV335(IC403) Pow er Input Signal
(5) COMPONENT / RGB
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EXT
1/2
X260
TP A
Comp 1/2
RGB
HDMI
1/2/3
CVBS
TP C
TP B / 656
AT/NT/
TUNER
LGDT
3303
VSB1/QAM TP
MST
3367
HS,VS
DVI
HS,VS
YCbCr 2
YCbCr or RGB
FRC9445H
RGB
CVBS
YCbCr 1
DVO
Y/C1, Y/C2
Y/C1, Y/C2
AV1/2
AV1/2
TMDS341A
1 : _Check HDCP Error
_Retr y po wer off and on (TV or S TB/DVDÖ )
_Check MST3361(IC402) HDCP IIC line (#69,#70)
2 : _Check EDID Download
(RX0C-,RX0C+) :
Frequenc y : Different acc ordi ng to
form at ! !
form at ! !
4 : _Check MST3361(IC402) Outp uts
SCL :
SDA :
3 : _ MST3361(IC402) inputs
(RX1C-,RX1C+) :
(Vsync) :
(DE) :
(Clk) :
(Hsync)
59.94Hz
Frequenc y : Different acc ordi ng to
form at ! !
form at ! !
(Data) :
5 : _Check X 260 (IC101) Inputs
_Sign al sh ape is same (abo ve)
Sno w noi se (Whit e dot) ?
Power o ff and on
(TV or STB/DVDÖ)
Vid eo is norm al & No Sound ?
Check HDCP Power Pin (IC404),
MST3361(IC402) IIC(#69,#70)
Check M ST3361(IC402) inpu ts
Power, Os c
#25,#26(RX1C-,RX1C+),
#14,#15(RX0C-,RX0C+)
Re-do wnloa d
EDID(IC406/407/408)
Check M ST3361(IC402) Outputs
V-out (#99) , H-ou t (#98) ,
Clock ( #96) , Data
1
2
3
4
N
Y
N
Y
Y
Check X260 ( IC101) Inpu ts
MST3361_HS(#T6) ,
MST3361_VS(#T5) , Clock ( #P3) ,
Data (30Bit) , DE(#U6)
5
(6) HDMI / DVI
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