LG 47WV30BS Service Manual page 21

7. THERE IS NO SOUND OUTPUT
THERE IS NO SOUND
OUTPUT
CHECK
INPUT JACK
(JK1000)
YES
CHECK AUDIO
PROCESSOR
IC701 OUT
(NTP-7000)
YES
1. CHECK SPEAKER
2. CHECK SPEAKER
CONNECOTR
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Only for training and service purposes
NO
CHECK SIGNAL CABLE AND
OUTPUT DEVICE
NO
CHECK VCC AND
PERIPHERALS OF IC701
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LGE Internal Use Only