47SL90QD-AA (CHASSIS:LB91L) - LG TV Service Manual (repair manual). Page 65

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Making 
Revision
2009. 2 . 1
25/25
LCD TV
Symptom
Intelligent Sensor Problem
Check MAIN B’D P5001
Revision 
Check IR B’D P1 Wafer
& Connector
Check MAIN B D P5001
Wafer & Connector
YES
YES
NO
Replace it
Replace IR B’D
& Connector
YES
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