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42LH250C (CHASSIS:LD91Z) - LG TV Service Manual (repair manual). Page 70

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Check IR B’D P1 Wafer
& Connector
Check MAIN B’D P1305
Wafer & Connector
YES
NO
Replace MAIN B’D IC100
IR B’D IC1 Pin #3
Voltage 4V ↑ ?
NO
NO
Replace it
YES
Replace IR B’D IC1
NO
Replace MAIN B’D IC100
Making 
Revision 
2009. 2 . 1
LCD TV
Symptom
Remote Control Problem
19~22LH250C
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