Motorola Moto G 3rd Generation Troubleshooting Manual page 214

Hall Effect Sensor
There is one hall effect sensor IC (U6170) on the main PCB board.
In the event of a hall effect sensor failure:
• Inspect physical placement and orientation of U6170 and its related components on
main PCB board (see hall effect sensor schematic page on next slide)
• Check power: VDD_HALL (1.8V) at U6170 pin 4
• Check that the sensor reports the presence of nearby magnetic fields. Do this by
floating the north side of a magnet directly over the sensor but on the opposite
side of the main board. The sensor is on the bottom/battery side of the PCB,
while the magnet must be held over the sensor on the opposite/display side of the
main PCB. When this is done, the display will turn off. The display will turn back on
once the magnet is moved far enough away.
• Make sure the sensor hub (U6000) is working correctly: see the "Sensor Hub"
section
MOTOROLA CONFIDENTIAL
Moto G (3rd Generation)
TROUBLESHOOTING GUIDE