Read LG 37LH50YD (CHASSIS:LB91B) Service Manual online
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