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No signal, weak signal.
1.11
No signal/weak signal is ordinary because of RF access barrier, or antenna
contact is not good cause, there have three reasons as follow:
1) Firstly check whether the antenna shrapnel contact pins bending or
breakage, change it if have.
2) And then, check R101、R102 device whether have leak stick or dry joint
phenomenon.
2013-10-18
YU220 service manualV1.0
Huawei secrets, no dispersion without permission
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