LG NP8540 - Audio

3-20
ELECTRICAL TROUBLESHOOTING GUIDE
①
Check 3.3 V
(CN501 Pin1).
Check UART signal
(CN500 Pin3, 4, 5, 7).
Check power circuit troubleshooting.
Check the IC504 and B/T module, replace it.
Replace the Bluetooth module.
YES
YES
YES
NO
NO
4-1. AUDIO (BLUETOOTH MODE)