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42LH250C (CHASSIS:LD91Z) - LG TV Service Manual (repair manual). Page 74

Read LG 42LH250C (CHASSIS:LD91Z) Service Manual online

Making 
Revision 
2009. 2 . 1
LCD TV
Symptom
IR Out Problem
Check the RS-232C Pin4 / HDMI Pin14
Check the IR waveform
of R1300
YES
NO
Replace it
Check the IR waveform
of IC1100_3,6,11Pin
YES
NO
Replace  the Preamp of IR ass’y. 
NO
Re-soldering or replace
the defect part
19~42LH250C
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