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LG 50PT350-ZK Service Manual page 38

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