Power Doesn't Stay On, Or Phone Is Jammed - Nokia NSC/W–1/3 Series Disassembly & Troubleshooting Instructions

NSC/W–1/3
PAMS
Disassembly & Troubleshooting Instructions Technical Documentation

Power doesn't stay on, or phone is jammed

If this kind of fault has come after flash programming, there are most prob-
ably open pins in ICs.
The soldered joints of ICs: D202 (MAD1), D201 (FLASH), N150 (CCONT),
D200 (SRAM) are useful to check first.
Normally the power will be switched of by CCONT (N150) after 30 seconds,
if the watchdog of the CCONT can not be served by software.
The watchdog updating can be seen by oscilloscope at pin 50 (DataselX) of
CCONT.
In a normal case there is a short pulse from "1" –> 0 every 8 seconds.
The power off function of CCONT can be prevented by connecting a short
circuit wire from CCONT pin 29 to ground.
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