Page 7 of 24
(
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
Summary of Contents for VIVO 4.8
Page 1: ...Page 1 of 24 BLU VIVO 4 8 Service Manual ...
Page 20: ...Page 20 of 24 2 2 4 9 M sensor Circuit 2 2 4 10 Gyroscope Circuit ...
Page 21: ...Page 21 of 24 3 Service tools equipment list ...
Page 22: ...Page 22 of 24 ...
Page 23: ...Page 23 of 24 4 Disassembly Instruction 5 ...
Page 24: ...Page 24 of 24 ...