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47LH50YD (CHASSIS:LB91B) - LG TV Service Manual (repair manual). Page 53

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Check Signal format
Is it supported?
Check the HDMI Cable
YES
YES
Replace MAIN B’D IC 100
MAIN B’D JACK Check
JK600 -> HDMI1
JK601 -> HDMI2
JK602 -> HDMI3
JK603 -> HDMI4
YES
Making 
Revision 
2009. 2 . 1
12/25
LCD TV
Symptom
HDMI1 or 2 or 3 or 4 No Video 
Problem
Check MAIN B’D IC600
YES
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