Mobile Terminal Is Totally Dead - Nokia 6255 Description And Troubleshooting

6255/6255i6256/6256i (RM-19)
Baseband Description and Troubleshooting

Mobile Terminal is Totally Dead

Mobile
terminal is
dead
Mobile termninal
current is zero or
too high?
NO
Mobile terminal
current is
<=30 mA
NO
Mobile terminal
current is
35 mA
YES
Is mobile terminal in
Local Mode?
YES
OK restart
Page 50
If current is zero, check X2002 to make sure
Vbat makes contact.
If current is too high, check for shorts.
Make sure all BB regulators are at their
respective voltage levels (VANA, VIO,
VCORE, VFlash1, and VR3). See phone's top
view diagram for test points.
Make sure the system Clk is 19.2MHz and that
the sleep Clk is 32KHz.
YES
Make sure PURX and SleepX signals are high
(1.8V).
Is mobile terminal
YES
flash programming
NO
Check BSI line
X2002, R2202,
NO
R2205, and C2015.
Are they OK?
©2005 Nokia Corporation
YES
OK?
NO
YES
NO
Company Confidential
Nokia Customer Care
Mobile
terminal is
jammed
Flash
faults
Change UEM
Repair
Issue 2 05/2005