Power Does Not Stay On Or The Mobile Terminal Is Jammed - Nokia 6255 Description And Troubleshooting

Nokia Customer Care

Power Does Not Stay on or the Mobile Terminal is Jammed

Mobile
terminal is
jammed
Measure VIO,
VCORE, VFlash1,
VANA, and VR3
voltages. Are they
OK?
YES
Measure 32kHz
Sleep Clk test
points. Are they OK?
YES
Measure 19.2MHz RF
Clk testpoint. Is it
OK?
YES
Measure PURX
(TP16) and SleepX
(TP10). Are they
high (1.8V)?
YES
Mobile
terminal is
jammed,
page 2
Issue 2 05/2005
Check VBATT, VIO,
VCORE, VFlash1,
VANA, VR3 capacitors.
Are they OK?
NO
Check BSI/BTEMP
lines and VBATT lines.
If OK, reflow or
change UEM
Measure the 32kHz Clk
NO
crystal. Is it OK?
Reflow or change UEM
Measure the 19.2MHz
Clk coming from the
NO
VCTCXO at C7205. Is it
Check R517, R521,
and D527. Are they
Change UPP
NO
Is PURX OK?
Is PURX OK?
YES
©2005 Nokia Corporation
6255/6255i6256/6256i (RM-19)
Baseband Description and Troubleshooting
NO
YES
NO
YES
NO
OK?
YES
NO
OK?
YES
NO
YES
NO
Company Confidential
Repair
Change B2200
Check G7200,
R7200, C7200,
C7203, R7205, and
C7207.
Repair
Change UEM
Change UPP
Page 53