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2013-10-18
YU220 service manualV1.0
No
charge
Check J801 whether the virtual
J
welding deformation, damage and
、
、
other anomalies
N
Measuring J801 Pin1 if the voltage is
about 5 v
Y
Measure the voltage Q02
Pin
Vs
Pin1,2,5,6 ） ≈Vd（Pin4 ）？
Y
R504 whether is
0.2R
Y
Replace U501 （PM）
Huawei secrets, no dispersion without permission
Replace J801
Y
？
5V ？
replace J801
N
（
ReplaceQ501
N
Replace R504
N
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