Run OFW heat spreader test

Ed McNierney ed at
Mon Jan 23 08:59:04 EST 2012

Richard (et al.) - 

Please keep in mind that early ramp units of XO-1.5 were sent to Australia, and they are different (specifically with respect to the heat spreader) than all the production units that follow.

	- Ed

On Jan 23, 2012, at 7:54 AM, Richard A. Smith wrote:

> On 01/23/2012 01:32 AM, Sridhar Dhanapalan wrote:
>> On 23 January 2012 17:20, James Cameron<quozl at>  wrote:
>>> I thought you were doing this test to detect early units that may have
>>> a failed heat spreader, and you were doing it at the time of reflashing
>>> because that's when you had some control.
>> Yes, that's the primary reason. Our initial batch of XO-1.5s have an
>> inefficient heat spreader. They've been burning out, and replacing the
>> motherboards is getting expensive and time consuming. We'd like to
>> detect potentially faulty units early, and recommend a heat spreader
>> change for them.
> Hmmm... Something else is the problem here.  You can't damage the processor via thermal overload because it has an automatic clock back off.  If you have motherboards that are failing its not due to a bad heat spreader.  At worst all you would get would be hangs.
> Can you acquire the serial number of the failed motherboards or is that not lost?
> -- 
> Richard A. Smith  <richard at>
> One Laptop per Child
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