Blu STUDIO 5.0 HD LTE, Service Manual

Page: 30 / 43

30 / 43
N0/WEAK SIGNAL TROUBLE SHOOING
No or weak
signal
Inspect the antenna and
antenna connector to see
if there’s any distortion
Replace the
defective
components.
Put a false antenna at RF PA
IC to see if there’s any signal
Replace RF
coaxial line
Make a false antenna
at RF filter, check if
there’s any signal
Saw filter is
damaged,
replace it.
Replace 26M oscillator
to check if the problem
is solved.
Re-weld or replace
CPU MT6582
YES
YES
Yes
No
Check and replace RF
coaxial line to see if
there’s
any signal
.
YES
Replace RF
PA