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42LM3400 (CHASSIS:LJ21C) - LG TV Service Manual (repair manual). Page 20

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No Raster On AV Video Signal
No Signal On TV(RF) Signal
Check Input source 
Cable And Jack
Pass
Check Input source 
Cable And Jack
Pass
Check The Input/Output
Of JK1601
Pass
Re-soldering or 
Change the defect part
Pass
Fail
Pass
Repeat [A], & [B] Process
Check the Input/Output
Of IC101
Fail
Re-soldering or 
Change the defect part
Pass
Check The Input/Output
Of TU3703
Pass
Re-soldering or 
Change the defect part
Pass
Fail
Check the Input/Output
Of IC101
Fail
Re-soldering or 
Change the defect part
Repeat [A], & [B] Process
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