Phone Switch It Self Off - Nokia 6150 Service & Repair Hints

Phone switch it self off

Check if this happens
only with 5V SIM-cards
and if the phone works
probably with 3V SIM's
Yes
Check the 5V
supply voltage on
C131 with an
oscilloscope
Yes
Change C131 if the
noise is higher than
350mVpp
version 1.0 / 19.10.1999
CONFIDENTIAL
Phone intermittend switches off
Yes
Check X101 and
X102, if poor soldered,
No
bent, soiled or old
version
No
Check amplitude of
32,768KHz square
wave at pin 124 of
MAD (2,8Vpp)
No
Check amplitude of
13MHz at pin 93 of
MAD (600mVpp)
No
Check VBB 2,8V DC
on pin 55 of N100
Service & Analysis Center Europe
Resolder, or change
Wrong
the connector
Change or check
soldering of B100,
Wrong
N100, R154, C101,
C102
Change or check
Wrong soldering of G650,
V600...
Change or check
Wrong
soldering of N100,
C107
Training Team
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