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15LS1R (CHASSIS:LP68A) - LG TV Service Manual (repair manual). Page 17

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- 17 -
No Sound
Check the speaker wire
Change source input.
Check the 
input source.
Fail
Pass
Re-solder or Change the
defect part.
Check X301.
Check the input/output 
of IC100
Fail
Pass
Re-solder or change the
defect part.
Check the input/output 
of IC400
Fail
Pass
Change the speaker
Check the speaker
Fail
Pass
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