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47SL80YD-DA (CHASSIS:LT91T) - LG TV Service Manual (repair manual). Page 65

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Check the SPDIF Cable
YES
Check MAIN B’D R2305
PWM Signal ?
Replace MAIN B’D IC 100
Speaker Audio OK
YES
Check MAIN B’D JK403
Replace MAIN B’D JK403
NO
YES
NO
Check the Trouble Shooting Guide
Related to Audio Problem
NO
Making 
전자 - 6-2
Revision 
2009. 2 . 1
22/25
LCD TV
Symptom
SPDIF No Audio Problem
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