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60PS40FR-TA (CHASSIS:PP91A) - LG TV Service Manual (repair manual). Page 39

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Making 
Revision 
2009. 2 . 1
PDP TV
Symptom
A. Picture Problem
Audio check method
A2
Jack for Speaker connection
1.Check Audio output by using oscilloscope
GND ↔ R+ or R- or L+ or L-
Audio output waveform
2.Check whether speaker jack was inserted properly or not.
Repair Process-Reference data
A2
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