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Z22LCD3 (CHASSIS:LA75E) - LG TV Service Manual (repair manual). Page 16

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5. No sound
- 16 -
Check the 
input Source.
Fail
Pass
Change the source input.
Check input/
Output of IC100.
Fail
Pass
Re-soldering of Change the defect part.
Check the X110
Check the input/
output of IC500
Fail
Re-soldering or Change the defect part.
Pass
Check the Speaker.
Pass
Check the Speaker wire.
Fail
Change the Speaker.
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