#12766 HIGH Opportu: XO-1.75 not charging batteries

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Fri Apr 25 17:45:08 EDT 2014

#12766: XO-1.75 not charging batteries
           Reporter:  Quozl                |       Owner:  Quozl                   
               Type:  task                 |      Status:  new                     
           Priority:  high                 |   Milestone:  Opportunity             
          Component:  embedded controller  |     Version:  Software Build 13.2.0-13
         Resolution:                       |    Keywords:                          
        Next_action:  diagnose             |    Verified:  0                       
Deployment_affected:  ni                   |   Blockedby:                          
           Blocking:                       |  

Comment(by Quozl):

 Measurements confirmed by another session:
  * CHG_LX, 7.4V
  * PQ61.1 vs PQ61.8, 1.9V
  * BGATE, 5.4V,
  * LGATE, 0.2V,
  * UGATE, 7.6V,
  * across PR185, 0.00 - 0.01V,

 Digital multimeter has three digit display, correctly shows stable zero on
 probe shorting, correctly shows occasional variation on open probes.

 No sign of physical damage or tombstoning around PR185, PR190, PR193,

 Conclusion: needs probing in the time domain, with an oscilloscope.

Ticket URL: <http://dev.laptop.org/ticket/12766#comment:4>
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