LG NP8540 - Page 42

3-19
① Check mode (Wi-Fi, B/T, Portable)
ELECTRICAL TROUBLESHOOTING GUIDE
4. AUDIO (Wi-Fi MODE)
AMP
Is the Vcc of IC700 18 V?
(Pin6, 43)
Is the Vdd of IC700 3.3 V?
(Pin30)
Check power circuit troubleshooting.
Check power circuit troubleshooting.
YES
YES
YES
YES
NO
NO
Check AMP I2S signal
(IC700 Pin23, 24, 25).
Check PWM signal
(IC700 Pin2, 4, 45, 47).
Check Audio signal
(CN700).
Replace IC700.
Replace IC700.
Check L701, L702
and speaker cable connection.
YES
YES
YES
NO
NO
NO
OK