NSW-5
Disassembly and Troubleshooting Instructions
PAMS Technical Documentation
Page 17
Issue 1 10/00
Nokia Mobile Phones Ltd.
1. Phone is totally dead
Phone does not consume current at all when the power switch is pressed,
or when the watchdog disable (J150) is grounded.
Battery voltage must be higher than 3.0 V. Otherwise CCONT prevents
power–on.
Phone is totally dead
YES
VBAT is 3.6 V at R153
NO
Failure in VBAT line
Check X105, X104, Z100, C100, C101
YES
Voltage at J150 of CCONT
(N150) is 3.6 V
NO
Faulty circuit N150
YES
C166 (VBB) 2.8 V
C158 (VR1) 2.8 V
when PWR switch is pressed
or watchdog disable pin is grounded
NO
CCONT (N150) J150 0V when
PWR switch is pressed or
watchdog disable pin is (X101 pin
11) grounded
YES
See section: Power Doesn’t Stay On
YES
Faulty circuit N150
NO
Check watchdog disable
line to X101
Check R164, PWR switch,
connector X300
Figure 1. Troubleshooting diagram for a totally dead phone
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