42LK410 (CHASSIS:LP91U) - LG TV Service Manual (repair manual). Page 16

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No Sound
Check The Input Sourse 
Check The Input/
Output of IC501
Re-soldering or 
Change the defect part
Fail
Pass
Pass
Check The Speaker
Change Speaker 
Fail
Check The Speaker Wire
Pass
Change The Source Input
Fail
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 JK103
Re-soldering or 
Change the defect part
Pass
Fail
Pass
Repeat [A]/[A-1], & [B] Process
Pass
Check the Input/
Output of IC800
Fail
Re-soldering or 
Change the defect part
Pass
Check The Input/
Output of TU600
Of TU500
Re-soldering or 
Change the defect part
Pass
Fail
Pass
Check the Input/
Output of IC800
Fail
Re-soldering or 
Change the defect part
Repeat [A]/[A-1], & [B] Process
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