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47LH90QD (CHASSIS:LT91C) - LG TV Service Manual (repair manual). Page 58

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Check Signal format
Is it supported?
Check the HDMI Cable
YES
YES
Replace MAIN B’D IC 100
Check the ADJUST MENU
EDID OK ?
YES
Download EDID
(Refer to Adjustment Spec)
NO
NO
Replace
MAIN B’D IC601 (HDCP KEY)
Making 
Revision 
2009. 2 . 1
11/25
LCD TV
Symptom
HDMI 1~4 All No Video Problem
24
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