Openmoko Bug #2229: GSM was working fine for months, suddenly will not register using any GSM stack
Openmoko Public Trac
bugs at docs.openmoko.org
Fri May 8 00:02:40 CEST 2009
#2229: GSM was working fine for months, suddenly will not register using any GSM
stack
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Reporter: danek2 | Owner: joerg
Type: defect | Status: accepted
Priority: normal | Milestone:
Component: hardware | Version: GTA02v5
Severity: critical | Keywords: calypso, gsm, registration
Haspatch: 0 | Blockedby:
Estimated: | Patchreview:
Blocking: | Reproducible: always
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Comment(by slm3095om):
Replying to [comment:12 joerg]:
> Replying to [comment:10 slm3095om]:
>
> Also you might try to simply attach a rocksolid 3V5..4V5 power source
instead of the battery. Beware of overvoltage!
One of these days I need to get a decent bench supply... in the meantime,
I used 3 D cells. According to my 'Poor Man's Scope' that never dropped
below 4.1 V.
> Maybe you could check the schematics / placement and test on both pads
of R1752 (NC) and on H-TP1701
I'm afraid your over estimating my capabilities... I'm pretty sure I could
hit the test point, I'm not so sure about the resistor. Besides, I'm still
trying to figure out how I would hold the battery in place, hold the probe
in place and issue the commands in the ssh session; I would need at least
three arms.
> If this problem is triggered by modem inrush current on registering,
could you please test with a different provider or - better - go to a
place with much higher signal (more close to the basestation) and try
registering there?
I took the phone and my notebook and parked across the street from a
tower. I ran the test twice,
once with a SIM from Fido (my normal SIM) and once with a SIM from Rogers.
In both cases the modem reset. This was with the FIC battery installed.
--
Ticket URL: <https://docs.openmoko.org/trac/ticket/2229#comment:13>
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