LG NP8540 - Page 44

3-21
ELECTRICAL TROUBLESHOOTING GUIDE
①
Is the Vcc of IC102
5.2 V? (Pin3)
Check Audio L/R signal
(L101, L102).
Is the Vdd of IC102
3.3 V? (Pin4)
Check ADC I2S signal
(IC102 Pin6, 7, 8, 9).
Check power circuit troubleshooting.
Check the device output or cable connection.
Check power circuit troubleshooting.
Check the IC504 and IC105, replace it.
YES
YES
YES
YES
YES
NO
NO
NO
NO
4-2. AUDIO (PORTABLE MODE)
OK