3-2-1.Gsm/Dcs Rx Troubleshooting - Lenovo A328 Service Manual

LENOVO
3.2 RF

3-2-1.GSM/DCS RX troubleshooting

Troubleshooting flow chart
Main related
（X101),RF-TR(U201),RF-PA（U101），RX FILTER（U103）
GSM/DCS/PCS RX does not
k
YES
Check inside place antenna is one feed and one
GND spring contacts Are those OK?
YES
Check antenna matching component OK?
YES
check PAand filter soldered status OK?
YES
Check TR working voltage Nominal
2.8V ?
YES
Check the RF-RX path component Are the
component in place and of correct
value/type ?
BBIC(U108)
component:
Check RX
circuit
NO
NO
NO
NO
NO
YES
Check BBIC & and TR (Soldered
XTAL
Soldered again or
replace
NO
Trim or replace antenna
Soldered again or replace
component is RX working now?
Soldered again or replace component
Check BBIC Soldered again or
NO
Replace damaged
missing component
again or replace
CRYSTAL
YES
YES
YES
END
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