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42LH90QD (CHASSIS:LT91C) - LG TV Service Manual (repair manual). Page 72

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Check IR B’D P1 Wafer
& Connector
Check MAIN B’D P5001
Wafer & Connector
YES
YES
NO
Replace it
Replace IR B’D
Making 
Revision 
2009. 2 . 1
25/25
LCD TV
Symptom
Intelligent Sensor Problem
38
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