CONFIDENTIAL
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Customer Care Europe, Middle East & Africa NHL-4u/NHL4/NHL-4j Repairhints
SCCE Training Group 6610/7210/7250 Version 3.0
2003 Nokia Mobile Phones
Date 21/05/2003
© NMP 2003
Checked by:
SCCE Training Group
Approved by:
CC Europe, Middle East & Africa
Phone is totally dead
Pre-check:
Try to turn on the phone.
o If nothing happens, follow repair instructions:
“Phone is totally dead”
o If the phone powers up but shuts down automatically, follow repair instructions:
“Phones powers down”
o If a loose battery causes the symptom “powers down”, follow repair instructions:
“Phone powers down”
Phone is totally dead
If the phone is totally dead, try to flash the phone.
If an error message from the flash prommer is shown e.g.:
o Boot serial line fail
o Phone fail response received
o Vpp voltage level fail
o Data block NAK
o Fiasco general
check VIO = 1.8V DC at C405. If the voltage is not ok, check components in VIO line from Flash D450 to UEM D200 for
shorts or interruptions and change or resolder faulty components.
Check Vcore = 1.8V DC at C403. If the voltage is not ok, check components in Vcore line from UPP D400 to UEM D200 for
shorts or interruptions and change or resolder faulty components.
If both voltages are ok, check general signals,
o RFCLK 26MHz at C420.
o 32kHz SleepClk at J404
Figure 1 RFClk 26MHz Figure 2 32kHz SleepClk
If both signals are ok, probably the D450 Flash is faulty and has to be changed. After changing it is necessary first to
flash the phone and than rebuilt IMEI/ESN and tune the phone.
Note! These signals are only measurable for about 5 – 10 seconds after connecting the phone to power.
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