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42LH4000, 42LH4010, 42LH4020 (CHASSIS:LD91G) - LG TV Service Manual (repair manual). Page 71

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Check IR B’D P1 Wafer
& Connector
Check MAIN B’D P1304
Wafer & Connector
YES
NO
Replace it
YES
Replace IR B’D
Making 
Revision 
2009. 2 . 1
32/34
 LCD TV
Symptom
Remote Control Problem
26~42LH2000
32~47LH3000/LH4000
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