Blu STUDIO 5.0 HD LTE, Service Manual, Page: 36 / 43

36 / 43
NO/LOW SOUND FROM MIC
No/Low sound from
MIC
No
Yes
YES
NO
Check if there’s
MIC cover
Install the MIC
cover.
Press power on and side
button to test mode and
activate echo loop,
measure MIC voltage is
1.5V
、
0.7V
Replace the MIC
Replace FPC to check if
the problem is solved
Replace the
FPC
Measure C1124
、
C1125
with multimeter to see if
there’s 0.5V offset voltage
Resolder or replace
CPU MT6582