Sim Card Has Not Be Detected - Lenovo X2 Service Manual

3.18 SIM Card has not be detected

Check the sim card current in the main
board; found out open current ;
Sim No detected
Change SIM card
N
Change SIM tray.
Check SN 、 IMEI have be
written?
Y
N
Change the U1001 and U1901
Y Change new
SIM card
Y Change new
SIM tray
N Rewrite
IMEI number.
Y
OK
Y
OK
SN and
30