Openmoko Bug #2335: GSM buzz on FreeRunner A7 (seven)

Openmoko Public Trac bugs at
Thu Apr 1 20:31:53 CEST 2010

#2335: GSM buzz on FreeRunner A7 (seven)
 Reporter:  blindcoder  |          Owner:  hardware             
     Type:  defect      |         Status:  new                  
 Priority:  normal      |      Milestone:                       
Component:  hardware    |        Version:                       
 Severity:  major       |       Keywords:  A7 gsm buzz capacitor
 Haspatch:  0           |      Blockedby:                       
Estimated:              |    Patchreview:                       
 Blocking:              |   Reproducible:                       
 There is a lot of GSM buzz on the FR A7 (recording attached).
 I was trying the capacitor next to the microphone with a multimeter:
 black cable to ground, red cable to right (close-to-mic) side with audible
 resistance checker gives signal (short circuit), but when applying a bit
 of force on red cable (connected to capacitor), audio signal stops,
 indicating loss of connection on the capacitor.

 Resoldering the capacitor gives way better audio quality on remote side
 (person I'm calling).

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openmoko trac

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