Motorola Moto X Force Troubleshooting Manual page 58

Battery and Thermistor
No turn on with battery only:
• If device does not power up with battery only, battery is most likely dead, or there could be an
issue with the battery safety control FETs in the PMIC or the safety IC. Also likely is an
intermittent or broken trace or via in the battery PCB or the flex, or with the board-to-board
connection of the battery to the board.
• If dead battery cannot be recovered with a charger, measure the battery voltage. If it is normal,
monitor on a scope for voltage dipping below 3V while attempting to power it up with battery. This
can happen due to high impedance FET or IC in the battery or excess current drain.
• If device powers up with factory cable, replace the battery, and if the issue is resolved, send the
battery to development team.
Thermistor reading out of spec:
• Thermistor usually reads between 20 to 30C, depending on ambient temperature and if device
has been in use or charging. This can be read with adb commands or under "Battery Info" in
CQA mode.
• Notify the mechanical engineer in charge of the battery and thermistor to inspect the rear housing
of device for any signs of thermistor damage.
• X-ray the NFC connector to ensure that it is seated properly and shorts/debris are/is not present
• Carefully measure the thermistor resistance with a meter. Take care not to apply unnecessary
pressure on the device so that condition can be preserved for analysis. If the measurement is not
between 8-12Kohms, hand the device as is to the mechanical engineer for further analysis and
corrective action.
MOTOROLA CONFIDENTIAL
Moto X Force/DROID Turbo 2
BASEBAND TROUBLESHOOTING GUIDES