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Charge fault
1.15
Failure Analysis: The phone cannot charge. The failure are usually two
situations: First, connect the charger to the phone, the phone did not
respond;
The other one is a mobile phone while charging display, but cannot charge
the battery. For non-charging fault plane, first test I / O interface, see if
there is visible damage
Maintain process：
2013-10-18
YU220 service manualV1.0
CTP
abnormal
Monomer is abnormal
No
To see if
there is
signal pin
shorted
Yes
Power circuit
No
I2C, RST
signal is
normal
Huawei secrets, no dispersion without permission
Update
Yes
the new
monom
er
Whether
No
Air welding
or poor
Update and
Yes
replace
U501
No
Replace
U301
After weld
and update
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