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General power checking
Check the following voltages:
Signal
Rename
Regulator
Sleep
Idle
Nominal
voltage
Main user
Notes
VIO
AVILMA
ON
ON
1.82
Memory, I/Os,
Display, USB
VBACK
AVILMA
ON
ON
2.50
Back-up
battery
VSIM1
AVILMA
ON
ON
1.8/3.0
SIM card
VSIM2
AVILMA
OFF
OFF
1.8/3.0
VDRAM
AVILMA
ON
ON
1.82
SDRAM
VAUX
AVILMA
OFF
OFF
2.78
Accelerometer,
hall sensor, ALS
VANA
AVILMA
OFF
OFF
2.50
VR1
AVILMA
OFF
ON
2.50
Crystal
oscillators
RF section
VRFC
AVILMA
OFF
ON
1.80
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
(sleep)
1.35
RAP3G digital
VOUT
BETTY
OFF
OFF
2.50
Accessory
connected
VCAM_2V8
LP3987ITLX-2.
85/N3303
OFF
OFF
2.85
Camera
Disabled in
sleep
VCAM_1V8
LM3677TLX-1.
82/N3301
OFF
OFF
1.80
Camera
Disabled in
sleep
VCAM_1V3
LP5952TLX-1.
3/N3302
OFF
OFF
1.30
Camera
Disabled in
sleep
VIBRA+
LP3985ITLX-3.
0/N2100
ON
ON
3.00
Vibra
Only turned off
in "Power off"
mode
VSD
LP3929TMEX-
AACQ/N4802
OFF
OFF
2.85
SD card
Disabled in
sleep
LIGHT
LP5521TMX/
N2401
OFF
OFF
3.6
2.1
Key light, top
light
alive light
RM-414; RM-570
BB Troubleshooting and Manual Tuning Guide
Issue 2
COMPANY CONFIDENTIAL
Page 3 –9
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