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12)
Trouble 12: WIFI ,BT cannot open
Possible Cause:
1) Check the WIFI/BT 2 in 1 Antenna is in proper state
2) Check all the power related to WIFI and BT are in correct level
3) Check the main chip U1001's welding is ok
13)
Trouble 13: MIC has no response
Possible Cause:
1) Check the connect between the main board and small board, if
the fpc is broken
2) Check the MIC, if it is damaged
3) Check the power Micbias0 is in proper level
4) Check RV1401,RV1402 ,make sure they are not be damaged
The follow is main circuit
14)
Trouble 14: No sound for Speaker
Possible Cause:
1) Check the connect between the main board and small board, if
the fpc is broken
2) Check the Speaker, if it is damaged
3) Measure the power Vbat, if it is existed, and if its level is correct
4) Measure the waveform of C416 and C424 ,if the waveform is ok
5) Check the welding of U401and U402
6) Check FB406,FB407,FB410,FB411
The follow is main circuit
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