User Guide

General power checking
Check the following voltages:
Signal name Regulator Sleep Idle Nominal
voltage
Main user Notes
VIO AVILMA ON ON 1.82 Memory, I/Os,
Display
VBACK AVILMA ON ON 2.5 Back-up
battery
VSIM1 AVILM ON ON 1.8/3.0 SIM card
VDRAM AVILMA ON ON 1.82 SDRAM
VAUX AVILMA OFF OFF 2.5 Camera, ALS,
Display
VR1 AVILMA OFF ON 2.5 Crystal
oscillators, RFIC
VRFC AVILMA OFF ON 1.8 RAP3G
converters
VRCP1 AVILMA 4.75 To RF parts RF active
VREF AVILMA ON ON 1.35 RF reference
VCORE BETTY ON ON 1.05
1.25
1.35
1.40
RAP3G digital
VOUT BETTY OFF OFF 2.5 Accessory
connected
VLEDOUT TPS61061/
N2301
OFF OFF 14.5 LCD Backlight Disabled in
sleep
Charging troubleshooting
Troubleshooting flow
RM-378; RM-379
BB Troubleshooting and Manual Tuning Guide
Issue 1 COMPANY CONFIDENTIAL Page 3 –9
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