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15LS1R-MG (CHASSIS:CL-81) - LG TV Service Manual (repair manual). Page 19

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No Sound
Check the speaker wire
Change source input
Check the 
input source
Fail
Pass
Re-soldering or 
Change the defect part
Check X301
Check the input/output 
of U301
Fail
Pass
Re-soldering or 
Change the defect part
Check the input/output 
of U201
Fail
Pass
Change speaker
Check the speaker
Fail
Pass
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