LG CM2760, Service Manual

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3-3
ONE POINT REPAIR GUIDE
2. SPEAKER NO AUDIO OUTPUT
No audio output problem occurs when you power on the unit.
2-1. NO SOUND
2-1-1. Solution
Reassemble AMP IC heat-sink, replace IC202.
2-1-2. How to troubleshoot (Countermeasure)
1) Reassemble AMP IC heat-sink (heat-sink screw must be assembled tightly).
2) Still NG, please check Q409, Q407, Q408 part out, if it is not appear 12 V.
3) If it is not appear 12 V, check IC202 pin48 output, is a high level.
4) If not high voltage, check whether IC202 damage, flash is lost.
2-1-3. Service hint (Any picture/ Remark)
< MAIN board top view >
IC202 IC202
Q408 Q408
Q407 Q407