Blu LIFE ONE M, Service Manual

Page: 40 / 47

40
WIFI
、
BT
、
FM
、
GPS defect repair flow chart
WIFI can’t open
，
Can’t work normal
Software update and check
the function is OK or not
Software update
Check U901 L12 pin have
3.7V +B supply voltage or
not
Check C801 have VBATT
V supply voltage or not
Replace U901
Check U903 3pin have
37.4MHZ clock signal output
or not by oscilloscope (OSC)
Replace U903
Resoldering or Replace
U901three in one IC
Resoldering or Replace
CPU MT6589
END
YES
YES
NO
YES
NO
YES
NO
YES
YES