LG E475F Service Manual page 76

2) SIM 2 & SIM 3 trouble shooting
Check "Triple SIM Settings"
SIM Card is inserted correctly?
TP 6 or 9 is 1.8V or 3.0V and active ?
LGE Internal Use Only
START
SIM 2 or SIM is checked ?
Yes
Yes
TP 10 & 11 is 1.8V ?
Yes
TP 4 or 7 is 1.8V or 3V ?
Yes
TP 5 or 8 is 1.8V or 3V ?
Yes
Change the Main B/D
END
No
Check the SIM slot 2 or 3.
No
insert SIM Card correctly
No
Change the Main B/D
No
Change the Main B/D
No
Change the Main B/D
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3. TROUBLE SHOOTING
Only for training and service purposes