Openmoko Bug #2229: GSM was working fine for months, suddenly will not register using any GSM stack

Openmoko Public Trac bugs at
Fri May 8 00:02:40 CEST 2009

#2229: GSM was working fine for months, suddenly will not register using any GSM
 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                    

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.

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