Reassembled XOs fail heat spreader test

John Watlington wad at laptop.org
Fri Jul 22 11:21:05 EDT 2011


Do your heat spreaders have four screws or three ?

The final heat spreader for XO-1.5 production had four screws
holding it down, to ensure a good fit.    If your heat spreaders
only have three, OLPCA should be able to get proper replacements
from Quanta.

Regards,
wad

On Jul 22, 2011, at 10:35 AM, Sridhar Dhanapalan wrote:

> We are currently engaged in changing the motherboards in over a
> hundred XO-1.5s. In many cases, the XOs are failing the heat spreader
> test afterwards.
> 
> However, we can get the test to pass if we press down on the lid,
> behind the screen. This suggests to me that the heat spreader is not
> in proper contact with the chips.
> 
> Without the lid plastic affixed (heat spreader exposed), we can see
> that the spreader is not touching the chips properly. We have tried
> bending the metal slightly near the screw points, but the contact
> doesn't last.
> 
> Is there any way that we can deal with this better? We are changing
> the motherboards in these XOs because they have succumbed to
> overheating. I want to avoid that from happening again.
> 
> Thanks,
> Sridhar
> 
> 
> Sridhar Dhanapalan
> Engineering Manager
> One Laptop per Child Australia
> M: +61 425 239 701
> E: sridhar at laptop.org.au
> A: G.P.O. Box 731
>      Sydney, NSW 2001
> W: www.laptop.org.au
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> 



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