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,
Display
VR1
AVILMA
OFF
ON
2.5
Crystal
oscillators, RFIC
VRFC
AVILMA
OFF
ON
1.8
RAPs
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
Combo
memory
VOUT
BETTY
OFF
OFF
2.5
Accessory
connected
VSIM2
AVILMA
OFF
OFF
2.2
Internal
microphone
Charging troubleshooting
Troubleshooting flow
RM-495; RM-496
BB Troubleshooting and Manual Tuning Guide
Issue 1
COMPANY CONFIDENTIAL
Page 3 –9
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