Nokia 3806, Руководство по обслуживанию

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RM-583
Baseband Description and Troubleshooting
COMPANY CONFIDENTIAL
Copyright © 2009 Nokia. All rights reserved.
Issue 1 Page 6-12
2. Soldered joints are OK.
3. ASIC orientations are OK.
Secondly, follow below instructions to do the troubleshooting for the specific circuitry failure. All failed
symptoms are categorized into following sections:
z
Power Does Not Stay ON
z
Audio Faults
z
Display Faults
z
Keypad Faults
z
No Vibration
z
USB Interface Disabled
z
FM Disabled
z
UIM Card Faults
z
T-Flash Card Faults
z
Camera Faults
z
Charging disabled
Note:
1. The Shielding Case Assy can not be reused after removal.
2. After using the heat gun, domesheet needs to be replaced.
„
Power does not stay on (refer to VREG_OUT circuit)
Below four cases which may cause this failure: big current, no current, no holding current and no
program in memory.
Case One:
Big current appears when power is fed to Vbattery or “power on” key is pressed on the handset.
1. Check if the following voltages of PMIC are normal: