Reply To: Ezbook 3 – A diary with some hints how to get the most out of your Jumpers

[Chupa]

My Jumper 3S is now 10 months old and so far holds at 9.8% lost battery capacity from last months.

After doing all the work to install 2 different fans etc.
installed 5mm spacers between all bottom lid screws to try a different kind of ventilation system
and made a Swiss cheese first with over 100 3mm holes to get the ventilation going
than with 20 to 30mm holes
here are my findings:
The darn fan mode does not work as expected.
I have a hot air exhaust out of 7 – 3mm holes what is strong enough to bow out a flame.
So cool air gets sucked from the bottom blows only over the copper cooler and picks up enough heat to make the exhaust air over 10ºC warmer than the surrounding air.
But the processor temperature does not sink even 1 degree.
The bottom gets cooler, the air gets warmer but the processor stays the same.
This makes no sense  for me.

So I ripped everything out again, got myself a 1mm thick slim slotted aluminum sheet to cover all the holes, gotta keep the bugs out and my fingers from accidently touching some parts of the exposed motherboard.
Then I cut off a breakfast plate what has a cork bottom, used some velcro stickers for easy connection and disconnection. They have tha same position as on the cooling pad with the big fan.
The first test was good but still not optimal, so I disconnected the back velcro pads and did a foam extension, also with velcro stickers.
I have now a 3mm front gap and good 10mm rear air gap.
It can stay on the bed and the bottom is still very well ventilated, also the connection is so sturdy that I need a knife between the pads to separate the velcro.

With all the modification I added good 200 gram to the Jumper but it is now no problem to have it in a 30ºC environment on my uncovered knees.
While tinkering around I discovered that the screen backlit what sits at the bottom of the screen lid can get quite warm and if the Jumper front sits on the stomach the warm bottom lit touches the knees and creates discomfort.
This is why I mounted the plate standing over in the back. No matter how crazy the angle is, nothing warm of the Jumper is touching me.
So my Jumper is now ready for 3 climate scenarios.

Cool 18-22ºC – no bottom plate, the rubber feat extend the soft part of the velcro stickers
Warm 24-28ºC  – bottom plate
Ay Caliente over 30ºC – cooling plate with switchable big fan

h1 the 5mm spacer and the longer screws needed to connect top and bottom
h2  I went medival  on my Jumpers bottom
h3 1 copper shimmy between the processor and the copper plate, 4 shimmies between the copper and the aluminum plate and 4 shimmies on top of the aluminum plate for pressure from the bottom plate – all 0.5mm and with thermo paste
h4 the bottom with 3 velcro stickers in place, one needs repositioning
h5 thermo bottom plate mounted side view, you see where the old fan switch was and what I did to the case to get the sd card in and out without using my fingernails
h6 Jumper front view
h7 10mm extension bumper for the rear
h8 bottom view
h9a Jumper with bottom plate
h9b Jumper with cooling plate

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1981 soldered my first Sinclair computer 1K, tapedeck * 1984 build and sold IBM clones 8Mhz, 512K, 20MB HDD * 2018 messing with ultrabooks