Motorola Moto Z Play Troubleshooting Manual page 34

"No Turn On" TROUBLESHOOTING
1. Check the PMI device charger input power supply voltage (USB_INx - PMUX_PWR).
2. Check the PMI device charger output voltage (CHG_OUTx - B_PLUS).
3. Check the other input power pins (VDD_xxx) at both PMICs.
4. Verify the logic levels at the external control pins:
a. PM device: CBL_PWR_N
b. Keypad power pins at both PMICs
c. PM device: OPT_[2:1]
d. RESIN_N at both PMICs
5. Check the internal reference voltages by probing the REF_BYP pin on both PMICs.
6. Check the regulated voltages that default to their on state. Note that the sequence depends on the hardwired connections
at the PM device's OPT_2.
7. Each of these should settle to within 5 to 10% of their target voltage before the PMIC continues its power on
sequence by initiating the next regulator. The devices shut down if any of these default regulators do not turn on and settle
properly.
8. If a device shuts down due to a failed regulator output, the start signal must be removed and reapplied to attempt another
power up.
9. Monitor the PM device's PON_RESET_N; verify that it goes to logic high after all the default regulators power up correctly.
10. Monitor the PM device's PS_HOLD; verify that it is at logic high. It can transition between logic states throughout the
power on sequence but must be stable at logic high within hundreds of milliseconds after the PON_RESET_N signal went
high. Confirm that this signal is applied to the PMI device's PS_HOLD pin.
11. If any of the first nine steps are not completed successfully, one of the installed PMICs has failed. If step10 fails, there
may be a problem with the modem device, one of the PMICs, or their interconnections.
MOTOROLA CONFIDENTIAL
Moto Z Play (Droid)/Moto Z Play
BASEBAND TROUBLESHOOTING GUIDE