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19LS3300 (CHASSIS:LP24A) - LG TV Service Manual (repair manual). Page 15

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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 JK101
Pass
Re-soldering or 
Change the defect part
Pass
Fail
Pass
Repeat [A]/[A-1], & [B] Process
Check the Input/Output
Of IC501
Fail
Re-soldering or 
Change the defect part
Pass
Check The Input/Output
Of TU401
Pass
Re-soldering or 
Change the defect part
Pass
Fail
Check the Input/Output
Of IC501
Fail
Re-soldering or 
Change the defect part
Repeat [A]/[A-1], & [B] Process
No Sound
Check The Input Source
Check The Input/Output
Of IC301
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
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