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 T2020 whether reverse, check C2020 resistance is very big or not, check
B2020
、
B2021 solder ok or not;
Fourth, check U1420 solder ok or not, re-hot U1420 or change a new one.
No charge
Check battery
can power on
normal or not?
Check battery
connector related
component
Check J1702
solder OK or
not?
Check T2020
& C2020
Check B2020
，
B2021
，
U1420ok or
not?
Change a new
one
Change T2020
or C2020
Change related
component
Check U1420
Hot or change
U1420
Y
N
N
N
N
N
Y
Y
Y
