General power checkingCheck the following voltages:Signal name Regulator Sleep Idle NominalvoltageMain user NotesVIO AVILMA ON ON 1.82 Memory, I/Os,DisplayVBACK AVILMA ON ON 2.5 Back-upbatteryVSIM1 AVILM ON ON 1.8/3.0 SIM cardVDRAM AVILMA ON ON 1.82 SDRAMVAUX AVILMA OFF OFF 2.5 Camera,DisplayVR1 AVILMA OFF ON 2.5 Crystaloscillators, RFICVRFC AVILMA OFF ON 1.8 RAPsconvertersVRCP1 AVILMA 4.75 To RF parts RF activeVREF AVILMA ON ON 1.35 RF referenceVCORE BETTY ON ON 1.051.251.351.40CombomemoryVOUT BETTY OFF OFF 2.5 AccessoryconnectedVSIM2 AVILMA OFF OFF 2.2 InternalmicrophoneCharging troubleshootingTroubleshooting flowRM-495; RM-496BB Troubleshooting and Manual Tuning GuideIssue 1 COMPANY CONFIDENTIAL Page 3 –9Copyright © 2008 Nokia. All rights reserved.
