42PT350-ZK, 42PT351-ZJ, 42PT352-ZH, 42PT353-ZG, 42PT351-ZJ, 42PTA351N-ZJ, 42PT353-ZG, 42PT353A-ZG, 42PT353K-ZG, 42PT353N-ZG (CHASSIS:PD13K) - LG TV Service Manual (repair manual). Page 69

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Speaker
Jack for Speaker connection
1.Check whether speaker jack was inserted properly on Main B/D side & speaker side or not.
2. Check whether speaker cable have problem (disconnection wire) or not.
A25
Making 
Revision 
PDP TV
Symptom
Repair Process-Reference data
Speaker cable checking method
C. Sound Problem
A25
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