Blu Touchbook 7.0 3G, Service Manual

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8)Trouble 9: NO network
Possible Cause:
1) make sure the RF Antenna is in well state
2) check the power VSIM1_PMU is in proper level
3) measure the waveform of S
SIM1_CARD_SCLK,
SIM1_CARD_SRST ,SIM1_CARD_SIO check the waveform is good
4) change component SIM1
5) Check the RF part’s circuit is ok 9
） Trouble 10: can’t read SD card
Possible Cause:
1) Check VMCH_PMU is in proper level
2) Measure the waveform of MC1CK,MC1DA0—MC1DA3,check the
waveform are good
3) change component TF1
10
）
Trouble 11: CTP can’t touch or no response
Possible Cause:
1) Check CN801 is ok
2) Check the power VGP2_PMU,
AVDD_GT910 ,VDDIO_CTP are in
proper level
3) Check U801’s welding is correct
4) Check the soft fpc well connected between the main board and
the TP
5) Change another TP
11
）
Trouble 12: WIFI ,BT cannot open
Possible Cause:
1) Check the ANT1006,ANT1007in 1 Antenna is in proper state