Blu DASH 3.5, Руководство по обслуживанию

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No charge
Check battery
can power on
normal or not?
Y
Check J1702
solder OK or not?
Y
Check T1710 &
C1802
Y
Check C1008, and
R1008 ok or not?
Y
Check U1001
3.3 Fail to display
The screen dose not shines or shows white:
N Check battery
connector related
component
N
Change a new
one
N Change T1710
or C1802
N
Change related
component
N
Hot or change
U1001
First, use DC power supply to start-up, check the board whether power on normal, ensure
main board can power on normal
Second, check LCD module, change a new module, check whether can display normal,
Third, check R0004, R1177, U1501 solder ok or not
Fourth, use oscilloscope to test LCD_BACKLIGHT_EN, check it whether high, if not, check
R1507 resistance, U0401 solder ok or not, re-hot U0401or check a new one.