#9501 HIGH Not Tri: Overvoltage killed XO-1.5 B2

[Zarro Boogs per Child]

#9501: Overvoltage killed XO-1.5 B2
------------------------------------+---------------------------------------
           Reporter:  wad           |       Owner:  wad        
               Type:  defect        |      Status:  assigned   
           Priority:  high          |   Milestone:  Not Triaged
          Component:  not assigned  |     Version:  1.5-B2     
         Resolution:                |    Keywords:             
        Next_action:  reproduce     |    Verified:  0          
Deployment_affected:                |   Blockedby:             
           Blocking:                |  
------------------------------------+---------------------------------------
Changes (by wad):

  * status:  new => assigned


Comment:

 When this resistor burns out, it usually indicates that Vin (the main
 laptop power rail) has been shorted to ground.  I fondly refer to this
 resistor as the "fuse", because it blows up frequently (whereas the real
 fuse never does).

 I tried to reproduce this problem (using a B1 motherboard):
 Shorting +3.3V to GND on the serial connector caused the processor to
 crash, but didn't fry anything.
 Shorting Vin to GND (at the serial connector) caused the laptop to reboot,
 but didn't fry anything.
 Shorting random power caps around the DCON to ground caused the processor
 to crash, but didn't fry anything.

 We have requested that this laptop be returned to 1CC for further failure
 analysis.

-- 
Ticket URL: <http://dev.laptop.org/ticket/9501#comment:1>
One Laptop Per Child <http://laptop.org/>
OLPC bug tracking system