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42LM3400 (CHASSIS:LT21C) - LG TV Service Manual (repair manual). Page 21

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No Raster on PC Signal
Check Input source Cable And Jack
Pass
Re-soldering or 
Change the defect part
Repeat [A], & [B] Process
Pass
Check the Input/Output
Of JK1104
Fail
Pass
Check the Input/Output
Of IC101
Fail
Re-soldering or 
Change the defect part
Pass
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