[DISCUSSION] Fans/Heatsinks/CPU Cooling Mods

userHead chiark 2016-05-13 19:49:58 299633 Views197 Replies
Hi folks, my lp has arrived and it's working well. Quick question - on idle the CPU temps are around 70-80 degrees C, with an ambient of about 15... Strikes me that it might be worth adding a heatsync - has anyone looked at this?
2020-12-06 22:18:24 . . . . .

The fan is connected to the right place, and the faint noise might be coming from it. Your toroid transformer might also be making the noise - I dont know how good your ears are. While you have power to the fan, flick the impeller with your finger to see if you can kick it into life. Otherwise it sounds like a dud fan. It would be dud if you tried it on DC first
userHeadPic Thomaskah
2020-10-05 23:25:15 The sensor is mounted in a plastic frame as a rule, so conductive cooling is not that effective, unless you are using a cold finger and the sensor design allows it. userHeadPic DonnaAlake
2019-03-24 11:01:28
Diomedes1905 wrote: ↑Tue Feb 26, 2019 1:11 am
acasta wrote: ↑Sun Jun 05, 2016 3:57 pm Hi!
I received my new heat sinks yesterday, and just tinkered around with them:

For reference: 40x32mm heat sink, small raspi-heat sink, 5V fan.
I made a mistake and got two of 40x40x11 mm heatsink, any help with a case?
Or at least, in how to modify an existing case?
userHeadPic diomedes.dominguez
2019-02-26 09:11:15
acasta wrote: ↑Sun Jun 05, 2016 3:57 pm Hi!
I received my new heat sinks yesterday, and just tinkered around with them:

For reference: 40x32mm heat sink, small raspi-heat sink, 5V fan.
I made a mistake and got two of 40x40x11 mm heatsink, any help with a case?
userHeadPic diomedes.dominguez
2018-11-25 05:00:34
LattePanda wrote: ↑Wed Nov 21, 2018 8:26 pm
fender90 wrote: ↑Wed Oct 24, 2018 7:43 pm
ED209 wrote: ↑Sat Aug 11, 2018 8:46 am

Yes. The key heating components, like power management unit and CPU, are placed at the bottom side.
Which I find to be a design flaw. If you place a heatsink of a fan you will make the board much thicker. They could place the CPU on the other side in thiis case the heatsinks would perfectly fit with the height of the pins
A customer designed thermal. Maybe a good sample for keeping it thin.
That's a great example. Unfortunately not every Lattepanda user has access to hardware required for building a custom cooling solution. Lattepanda is perfect almost in everything. The only things that keep me to switch my projects to Lattepanda completely is the lack of effective yet thin cooling solutions and absence of official Android build for the board. In any other way it is almost perfect
userHeadPic fender90
2018-11-22 04:26:01
fender90 wrote: ↑Wed Oct 24, 2018 7:43 pm
ED209 wrote: ↑Sat Aug 11, 2018 8:46 am
Pectabyte wrote: ↑Thu Aug 09, 2018 2:43 am Does it matter which side of the board you mount the heatsink/fan too?
Yes. The key heating components, like power management unit and CPU, are placed at the bottom side.
Which I find to be a design flaw. If you place a heatsink of a fan you will make the board much thicker. They could place the CPU on the other side in thiis case the heatsinks would perfectly fit with the height of the pins
A customer designed thermal. Maybe a good sample for keeping it thin. Attachments Passive Cooling and 4 inch display.jpeg Passive Cooling and 4 inch display.jpeg (206.44 KiB) Viewed 26739 times

attachments:

Passive Cooling and 4 inch display.jpeg

userHeadPic LattePanda
2018-10-25 03:43:26
ED209 wrote: ↑Sat Aug 11, 2018 8:46 am
Pectabyte wrote: ↑Thu Aug 09, 2018 2:43 am Does it matter which side of the board you mount the heatsink/fan too?
Yes. The key heating components, like power management unit and CPU, are placed at the bottom side.
Which I find to be a design flaw. If you place a heatsink of a fan you will make the board much thicker. They could place the CPU on the other side in thiis case the heatsinks would perfectly fit with the height of the pins
userHeadPic fender90
2018-08-11 16:46:04
Pectabyte wrote: ↑Thu Aug 09, 2018 2:43 am Does it matter which side of the board you mount the heatsink/fan too?
Yes. The key heating components, like power management unit and CPU, are placed at the bottom side.
userHeadPic ED209
2018-08-09 10:43:20 Does it matter which side of the board you mount the heatsink/fan too? userHeadPic Pectabyte
2018-07-16 11:19:22
fender90 wrote: ↑Tue Jul 03, 2018 3:54 pm
ED209 wrote: ↑Tue Jul 03, 2018 2:36 pm @fender90, this is sooooo... coool... I'm not good at mechanical design. So how can I build my own heatsink like you've shared your design file from local vendor. Is there any note for that!!!!!?

Appreciate for your great contribution.
This is just a prototype design. I didn't to much calculations on the fins size and distance from each other. Usually when a heatsink is design it should have exact proportions based on the power usage, the temperature, average environment temperature, heatsink material, e,t,c. So Im not sure about the efficiency of the heatsink from my design.If anyone who knows mechanical design could provide me with the exact numbers I would update the design and upload the new file.

Based on the file it should be possible to order this heatsink from a shop with CNC router.
Thanks for your sharing. Will you make a sample to test?
userHeadPic ED209
2018-07-03 23:54:06
ED209 wrote: ↑Tue Jul 03, 2018 2:36 pm @fender90, this is sooooo... coool... I'm not good at mechanical design. So how can I build my own heatsink like you've shared your design file from local vendor. Is there any note for that!!!!!?

Appreciate for your great contribution.
This is just a prototype design. I didn't to much calculations on the fins size and distance from each other. Usually when a heatsink is design it should have exact proportions based on the power usage, the temperature, average environment temperature, heatsink material, e,t,c. So Im not sure about the efficiency of the heatsink from my design.If anyone who knows mechanical design could provide me with the exact numbers I would update the design and upload the new file.

Based on the file it should be possible to order this heatsink from a shop with CNC router.
userHeadPic fender90
2018-07-03 22:36:08 @fender90, this is sooooo... coool... I'm not good at mechanical design. So how can I build my own heatsink like you've shared your design file from local vendor. Is there any note for that!!!!!?

Appreciate for your great contribution.
userHeadPic ED209
2018-06-29 21:43:18 HI there!

I finally joined the LattePanda community.
I got a 4/64gb version of the board.
First thing I noticed that the board gets very hot when watching videos or doing any other CPU demanding stuff.
However I didn't find any good heatsink for effective passive cooling, so I decided to design my own.

I created a prototype design
LP heatsink.zip (91.95 KiB) Downloaded 300 times As you can see the heatsink should be the same size as the LP board and have mounting holes located on the same places as the board, so it would be possible to secure the LP and the heatsink to a diy base or case using screws or longer standoffs.
heatsink1.png heatsink1.png (42.22 KiB) Viewed 18885 times
The heatsink should have fairly large fins for effective heat dissipation.
heatsink2.png heatsink2.png (31.28 KiB) Viewed 18885 times The material in the central part of the heatsink bottom should be routed out leaving only contact points for CPU and other chips. The mounting holes have something similar to legs, which should provide airflow and This will provide airflow and ensure there is no contact between the heatsink and the contact points on the board.
The heatsink should be placed on the CPU directly using thermal adhesive or thermal conductive tape.
heatsink3.png heatsink3.png (25.3 KiB) Viewed 18885 times
Top view of the heatsink
heatsink4.png heatsink4.png (16.52 KiB) Viewed 18885 times
Another View
heatsink5.png heatsink5.png (43.3 KiB) Viewed 18885 times


You can find a ZIP file with STL and OBJ files in the attachments.

Unfortunately I'm not a professional heatsink designer so I don't know how to calculate the correct dimensions of the fins on the heatsink so it would be as efficient as possible.

If there are any people here who know how to it I can update the design using correct dimensions and share the files with you so everyone could make one using a CNC machine


Thanks!

attachments:

heatsink5.png

attachments:

heatsink4.png

attachments:

heatsink3.png

attachments:

heatsink2.png

attachments:

heatsink1.png

attachments:

LP heatsink.zip

userHeadPic fender90
2018-06-21 11:22:02 We are also using the 2 of the pins on the 4 pin header.
I'm afraid that there is no such pin can meet your demands.
userHeadPic LattePanda
2018-06-15 22:46:36 Ok dumb question, what pins do you use to power your fan, I am using 2 of the pins on the 4 pin header but the fan doesn’t shut down when I power off, is there 2 pins that powers off with the motherboard so you don’t have to unplug the unit ? Ps please give a good location to use as I’m an old guy with 63 year old eyes. Thanks Watermanjim1 userHeadPic Watermanjim1
2018-06-08 11:03:25 Actually you can make one by yourself!
We can provide the Size Information if you need!
And really appreciate for any cool idea!
userHeadPic LattePanda
2018-05-24 15:59:22 @andreysblada
Try to Google it , which will be more faster and convenient!
userHeadPic LattePanda
2017-12-15 17:48:08 Thanks for all ! Feel free to discuss. userHeadPic LattePanda
2017-11-03 03:46:40
MarkF wrote: ↑Wed May 10, 2017 4:01 pm I am interested in this as well, I have the DFrobots fan which connects to the CT2 pins and works great but the fan still runs when you power down windows.
iamisraeli wrote: ↑Wed Apr 05, 2017 5:08 pm anyone know how to turn off the fan when system is off automatically?
I you have a Relay or a NPN Transistor you can control the Fan by using this mod for Open Hardware Monitor (Power On when system start - Power Off when system shutdown - Activate by CPU temp)

http://lattepanda.com/forum/viewtopic.p ... 7104#p7104

Hope it helps!
userHeadPic LNC-SPN
2017-11-03 03:39:09 For cooling my LattePanda I use a 30x30mm aluminium heatsink plugged to the backplate, a mini cooper heatsinks for the RAM and eMMC and a blower type fan.

To control the fan I made a mod for Open Hardware Monitor:
http://lattepanda.com/forum/viewtopic.php?f=11&t=1685 Attachments LattePanda_BlowerFan_Backplate.jpg LattePanda_BlowerFan_Backplate.jpg (3.3 MiB) Viewed 23821 times LattePanda_Heatsink_Backplate.jpg LattePanda_Heatsink_Backplate.jpg (1.88 MiB) Viewed 23821 times

attachments:

LattePanda_Heatsink_Backplate.jpg

attachments:

LattePanda_BlowerFan_Backplate.jpg

userHeadPic LNC-SPN