Blu DASH 3.5, Руководство по обслуживанию

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Fourth, if the current stay in 40mA, we should check the circuit around flash, when CPU
calling program from flash fail, the current will stay in 40mA, re-download the software or
change a new flash or CPU.
Fail to power on
N
Check if the battery
Change
is OK. battery
Y
Check if battery
N
Resold
connects solder ok
connect
Y
Is power key OK?
N Change a new
power key
Y
Check each power
N Re-solder or
out of PMU
replace U1001
Y
Re-download
Y
Software
OK
N
Resold or replace
Y
U502
OK
N
Y
Resold or replace OK
U0401
3.2 Fail to charge
Check charging circuit related component, check below information in sequence:
First, checks whether boot normal use the battery, if not check battery connector solder ok
or not;
Second, check USB connector on board solder ok or not;
Third, check T1710 whether reverse; check C1802 resistance is very big or not.
Fourth, check U1001 solder ok or not, re-hot U1001 or change a new one.