47LH30 (CHASSIS:LA92A) - LG TV Service Manual (repair manual). Page 18

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LG Electronics. Inc. All right reserved. 
C
2009
3. Digital TV Video
Check RF Cable & Signal
 OK
Check Tuner 5V Power
TU1001 4Pin
NO
Check IC1002
Check IC1005(19",22")
 OK
Check IF_P/N Signal
NO
Bad Tuner. Replace Tuner.
 OK
Check Check Demodulator Input
Clock(X1005)
NO
Replace X1005
 OK
Check IC400(LGDT) Output
- AR1070, AR1071
NO
Replace IC1004
 OK
Check Mstar LVDS output
R812,R813 .R821
NO
Replace Mstar(IC100)
or Main board
4. Analog TV Video
Check RF Cable
 OK
Check Tuner 5V Power
TU1001 4Pin
NO
Check IC1002
Check IC1005(19",22")
 OK
Check CVBS signal.
TU1001 #19 Pin
NO
Bad Tuner. Replace Tuner.
 OK
Check Mstar LVDS output
NO
Replace Mstar(IC100)
or Main board
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