Lenovo P70-A Service-Handbuch - Seite 24
Blättern Sie online oder laden Sie pdf Service-Handbuch für Mobiltelefon Lenovo P70-A herunter. Lenovo P70-A 41 Seiten.
Seite drucken
Repair Manual of Lenovo P70-A Mobile Phone
Fault: AGC calibration Fail.
Reason: RF test cable is not connected well during calibration; the devices in receiving
cable are in cold solder joint (such as RF connectors, antenna switch, saw the filter and
the surrounding capacitance).
Shooting：
GSM frequency
band fails?
Whether U1001Rx is in
Y
Re-weld
cold solder joint?
N
Y
Whether U1002
Re-weld
Rx is in cold
solder joint?
Whether U801 Rx is in cold
Y
Re-weld
solder joint?
Notes: Remeber to recalibrate after replacing compoments.
4.11.2 AGC
Rx path lo
calibration fails
Check calibration report to see
N
whether the two frequency
bands fail?
Y
X801 is
Whether
in
cold solder joint
N
N
Whether Rx is in cold
solder joint?
Whether C809 are in cold
solder joint?
N
N
Check the baseband chip
U401
Check whether RF cable
Y
Re-weld
and
connected?
Y
Re-weld or
replace
N
Re-weld or
Y
replace
N
23
Y
fixtures
are
well
Y
Check whether RF
connector J1001
is in cold
solder joint?
N
Whether R137 is in cold
solder joint?
N
Reconnect and
calibrate
Y
Re-weld
J1001
Y
Re-weld