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RZ-26LZ55HW (CHASSIS:ML-041E) - LG TV Service Manual (repair manual). Page 18

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No Sound
Check the speaker wire
Change source input
Check the 
input source
Faill
Pass
Re-soldering or 
Change the defect part
Check the input/output 
of IC1
Faill
Pass
Re-soldering or 
Change the defect part
Check the input/output 
of IC100,IC101 
Faill
Pass
Change speaker
Check the speaker
Faill
Pass
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