LG 32LB9D (CHASSIS:LB73B) Service Manual ▷ View online
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EXT
1/2
X260
TP A
Comp 1/2
RGB
CVBS
TP C
TP B / 656
AT/NT/
TUNER
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
3._ Check X 260 Input ( CLK, SOP, Valid, Error, Data)
Check X260 I NPUT CLK, SOP,
Valid, Error, Data
TPCLK
TPSOP
TPVALID
nTPERR
nTPERR
TPDATA[7:0]
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EXT
1/2
X260
TP A
Comp 1/2
RGB
CVBS
TP C
TP B / 656
AT/NT/
TUNER
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
- 19 -
EXT
1/2
X260
TP A
Comp 1/2
RGB
CVBS
TP C
TP B / 656
AT/NT/
TUNER
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
HDMI
1/2/3
TMDS341A
1 : _Check HDCP Error
_Retr y po wer off and on (TV or S TB/DVD
)
_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/DVD )
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-downloa 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
- 20 -
Symptom : T V set out of ord er on po wers
Check X300 ( 24MHz)
Norm al?
Re-downloa d
MTV416GMF (IC309 )
Norm al?
YES
NO
Replace MTV416GMF (IC309 )
and Re-do wnload
Check SI3865(Q702) 2,3pin 5V
Normal?
Replace Power board
Normal.
Check P702 all input voltage
Normal ?
YES
Check SI3865 (Q1901
,Q1902,Q1903) 2,3pin 3.3V
Normal?
YES
Check SI3865(Q702) 5pin 3.3V
Norm al?
Check SI3865 (Q1901,Q1902
, Q1903 ) 5pin 3.3V Normal?
NO
NO
NO
Check P702 wafers & connectors.
Normal ?
YES
Check P701 #3,8Pin 5V
Normal ?
YES
Replace po wer b oard.
NO
NO
Replace SI3865(Q702)
YES
Replace SI3865(Q1901,Q1902,Q1903 )
YES
NO
YES
Symptom : No booting
Check X300 ( 24MHz)
Norm al?
Re-downloa d
MTV416GMF (IC309 )
Norm al?
YES
Replace MTV416GMF (IC309 )
and Re-do wnload
Check SI3865(Q702) 2,3pin 5V
Norm al?
Check SI3865 (Q1901,Q1902
,Q1903) 2,3pin 3.3V Normal?
YES
Check SI3865(Q702) 5pin 3.3V
Normal?
Check SI3865 (Q1901,Q1902,
Q1903 ) 5pin 3.3V Normal?
NO
NO
Replace SI3865(Q702)
YES
Replace SI3865(Q1901,Q1902,Q1903 )
YES
NO
YES
Check SI4800 ( Q315)1,2,3Pin
1.9V Normal?
1.9V Normal?
Replace SI4800( Q315)
Replace SC2621(IC304)
YES
NO
NO
Check between FB1714 and
C345 1.2V Normal?
Replace SI4800( Q300,Q301)
Replace SC2621(IC304)
NO
NO
NO
(7) POWER
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