Troubleshooting For Bb Part; Initialization - Nokia 2228Arte Service Manual

RM-377
BB Troubleshooting and Manual Tuning Guide

Troubleshooting for BB part

Initialization

a. Check battery voltage shall be bigger than 3.7V.
b. Check the resistance of battery ID pin is between 20K ohm and 140K ohm, the resistance of TP on
PCB is between 120K ohm and 60K ohm.
c. Check regulator output voltage.
VREG_MSMC = 1.2V ; VREG_MSMP = 2.6V ; VREG_MSMA = 2.65V
VREG_MSME1 = 1.8V ; VREG_MSME2 = 2.9V ; VREG_TCXO = 2.85V
d. Check power on sequence.
KPDPWR_N pin low
BAT_FET_N pin low
Voltage regulators turned on in a sequence.
PON_RESET_N pin high.
PS_HOLD pin high
e. Check SW code version (or re-download SW code again)
Issue 1
Figure 2 High-level power sequences timing diagram
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