Android TV Box Overheating – Solution

This budget 2GB/16GB S905W Android TV box used to cook at over 90°C, starting to chop just minutes into any HD streaming, so I removed the cover it to find out what the heck was going on inside… What I found was 46x46x1.5mm iron heatsink plate and 7mm thick (!) silicone thermal pad bridging a connection between the plate and a chip, all enclosed in a slender plastic box with zero airflow – pretty much hopeless situation, especially when tucked beneath a TV… I made a makeshift thermal adhesive (hi-temp epoxy glue + alumina powder), glued a thick sheet aluminum heatsink directly on top of a chip, then scavenged the old USB cable and rigged it to a 5V, 40mm maglev fan, drilled the hell out of the housing cover to get sufficient airflow, used some double-sided adhesive tape to attach the fan and – voilà! Fan draws power from the boxes’ own USB port, so it starts and shuts down with the system (there’s also a solution to power it from TV’s USB port). The only downside to this mod (beside voiding a warranty) is moderately audible fan noise (airflow hiss), but CPU temp now clocks around 60°C while streaming and typically 47°C on idle – no more chopping and freezing!
UPDATE: Fan speed reduced (split the red wire leading to the fan and soldered two parallel-connected 39 Ohm resistors). No more fan noise!