TPS900 repair user guided V1.0
4
re-solder it to eliminate the hidden issue.
3. Maintenance cases
3.1.
C
AN NOT POWER ON
Mainly there are following power on issue:
1.
It has not any response on the screen after press the power on key.
2.
After press power key, it show “Android” on the screen, but do not go a head.
3.
After turn on, it reboot itself automatically.
Checking:
1)
It must install the battery. Otherwise, it can not power on.
2)
Check the energy of the battery is used out or not. Try to charge the battery for some time
for example 1-2 hours.
3)
Replace the battery with a normal one to test it.
4)
Check the power on key, Volume key and function key. Maybe one or two keys are embed in
the device and lead to the key is always touched.
5)
Check the battery connecting PINs are ok or not. Maybe some PINs become broken. Or the
connector becomes loose. If so, it needs to solder the connector.
6)
If all above status are ok, try to reload the firmware with QFIL tool.
7)
If still has the issue, please try to replace the mainboard.
3.2 Can not access Android system
After press the power on key, it can show the “Android”. But it can not startup the Android
system normally, then stopped or reboot itself.
1)
Check the energy the battery is used out or not. Try to charge the battery for some time
2)
Try to reload the firmware.
3)
Try to re-solder every Pins of the wireless Module.
4)
Try to change the mainboard with another normal one to test it.
