Tag Archives: mini0806

mini0806 design flaw

Alternative title: why my mini0806 was crashing and stopped working after a light drop.

One of the differences between mini0805 and mini0806 is this heat sink:
IMG_20160703_110658

It is a bitch to remove, so I gently coerced it with a blade:
IMG_20160703_110803

After some time of gentle pushing and heating it managed to peel off:
IMG_20160703_111536

Revealing Samsung ram chip and Ambarella A7LA50 SoC:
IMG_20160703_111758

Here is why it was not working after slight drop (and crashing before that):
IMG_20160703_113213

Pulled out pads! Note that the blade I used to remove would cause other side of pads missing if I applied too much pressure.

My theory is following: the heat sink that bridges RAM and SoC is causing stress on these chips. Mostly because it is glued and not mechanically pressed against the chips. This is a very silly design flaw, if for example, only SoC would have the heat sink (like found on IP cameras) then there would not be any stresses. I don’t think RAM needs heat sinking on those things.

I am tempted to take dremel to my other mini and split the heat sink in two…