#9761 NORM 1.5-har: XO 1.5 B2 not booting even after EC reset

[Zarro Boogs per Child]

#9761: XO 1.5 B2 not booting even after EC reset
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           Reporter:  TMarques   |       Owner:  wad           
               Type:  defect     |      Status:  assigned      
           Priority:  normal     |   Milestone:  1.5-hardware-C
          Component:  hardware   |     Version:  1.5-B2        
         Resolution:             |    Keywords:                
        Next_action:  reproduce  |    Verified:  0             
Deployment_affected:             |   Blockedby:                
           Blocking:             |  
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Comment(by Quozl):

 Replying to [comment:2 TMarques]:
 > Ok, will report back if it happens. It's been the only time it happened
 since I received it.
 > By component values, do you mean that B2 units differ from each other?

 Yes.

 Every B2 differs from every other B2 at a component level; they are not
 using the same components, they are using components that are slightly
 different; e.g. resistors have a batch tolerance, if they are specified as
 having a resistance X they are allowed to have a resistance of X plus or
 minus 1% of X.

 There are a class of problems that only reproduce with specific unusual
 mixes of slightly different components.  As Wad says, this might be one of
 these problems.

 Components can also be faulty, or installed incorrectly.

 OLPC might want to investigate the fault by taking back the unit you have
 and subjecting it to detailed bench analysis.  We'd normally send you
 another one at the same time so that you can continue testing.

 I agree with Wad; please tell us if it happens again.

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Ticket URL: <http://dev.laptop.org/ticket/9761#comment:3>
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