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1)
Trouble 1:The tablet can't be charged when inserting the adapter
Possible Cause:
1) Check if the voltage of CN1401 is above 3.4V. If it is, the touch between
the usb connector and main board is bad ,either the usb connector ,fpc
connector or the soft fpc is bad
2) check U1401,if the welding is ok
3) the LCD is bad ,can not display the charger Icon, change the LCD
module
2)
Trouble 2: No reaction when turns on
Possible Cause:
1) Check if
the connector CN1301 is ok, if it is , check the resistor
RV1305 'state
2) cheek if the battery's voltage is below3.4V, if it is, please insert the
adapter to charge the tablet
3) check the keyboard fpc: if the fpc is ok ,if it is not ,please change
another, if it is, please check the fpc is well inserted
4) check if the fpc between LCD and main board is ok
5) download the tablet again
3)
Trouble 3: backlight of LCD is not lights after turns on
Possible Cause:
1) check if the fpc between LCD and main board is ok
2) check if the power VBAT is in good state
3) check the whole Pathway is ok
4) check U902 is ok
the control circuit as below:
Troubleshooting
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