BLU Products BLU VIVO IV, Руководство по обслуживанию

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GSM
Maintenance Flow Chart of the Transmitting Issue:
（
NO launch
）
Connect the PC and the phone with maintenance line,
then making the phone into the RF state with META software
Check Transceiver to see
if IQ signals exist.
`
Check the PA output to
see if there is RF signal in
the path.
Y
Check CPU
N
Check RF coaxial
switch or matching
network.
Y
Check the Transceiver
to see if there is RF
signal output.
N
VBAT,PA_EN,BAN
DSW_DCS,VAPC
是否
OK?
Replace PA
Y
Check CPU
Y
Check Transceiver if LE
、
SCLK/SDAT
、
RFVCOEN
、
VCXOEN
have the correct signal .
N
N
N
N
Y
Replace Transceiver