Huawei YU220, Service Manual

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YU220 service manualV1.0
2013-10-18
Huawei secrets, no dispersion without permission
No
No
Yes
CTP
abnormal
Monomer is abnormal
To see if
there is
signal pin
shorted
After weld
and update
Update
the new
monom
er
Whether
Air welding
or poor
Power circuit
I2C, RST
signal is
normal
Yes Update and
replace
U501
No
Replace
U301
Yes
No
1.15
Charge fault
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：