LG NP8340BM0 Service Manual page 38

ELECTRICAL TROUBLESHOOTING GUIDE
4-1. AUDIO (Wi-Fi MODE)
AMP
Is the Vcc of IC700, IC701
19 V?(Pin2)
Is the Vdd of IC700, IC701
Pin27, 3.3 V?
Check mode (Wi-Fi, B/T)
Check AMP I2S signal
(IC700 Pin20, 23, 24).
Check PWM signal
(IC700 Pin1, 4, 43, 36).
Check audio signal
(CN701).
OK
YES
YES
YES
YES
YES
YES
YES
NO
Check power circuit troubleshooting.
NO
Check power circuit troubleshooting.
NO
NO
Replace IC700, IC701.
NO
Check L700, L701
and speaker cable connection.
3-19
Replace IC700.