Zenfox T3 Triple channel dash cams free test invitation, limited quantity

HonestReview said:
The tape is meant to shield the cable for the front and rear camera. So it serves a purpose. I'm not trying to create another issue by allowing interference. I intend to peel back tape but not fully remove it.
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I didn't mean remove it completely, just stick it on top of the heatsink instead of underneath, and maybe shorten it to what is required for shielding.
 
Nigel said:
I didn't mean remove it completely, just stick it on top of the heatsink instead of underneath, and maybe shorten it to what is required for shielding.
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Then you're obstructing airflow from the heatsink fins. Best option I believe is peel back tape to expose as much of the emi shield as possible, without completely removing the tape.
 
HonestReview said:
Then you're obstructing airflow from the heatsink fins. Best option I believe is peel back tape to expose as much of the emi shield as possible, without completely removing the tape.
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If you leave it underneath then you are obstructing heatflow to all the fins since you will need a much thicker layer of paste, on top it is only affecting a small part of the heatsink.
 
Nigel said:
If you leave it underneath then you are obstructing heatflow to all the fins since you will need a much thicker layer of paste, on top it is only affecting a small part of the heatsink.
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There's no good option, however, I plan to peel back tape directly over the SOC. That's the main area where heat transfer needs to be drawn away. The outer portion of the heat shield isn't as crucial. Blocking the fins is a bad idea. I'm not even going to put back the black tape over the Capacitor except enough to hold in place.

To many issues going on here. It'd be far worse to block the fins any further than to open up coverage and leave a little bit of tape on the sides of the EMI shield.

Honestly, it's to be seen whether any solution fixes the camera. I can't speculate until Tuesday when my order arrives.
 
First of all i would like to thank my sponsor Dremel for sending me absolutely nothing, and second the Technical university of Denmark for teaching me absolutely nothing.

So using my Dremel knockoff ( not even a proxxon ) and a bucket full of good intentions i set sail on the high seas of dashcam modification.
After realizing that the SD card slot, and the two connectors for the cables was higher than the soc ( stand 1.7 mm tall over the PCB )

So first i cut the EMI shield so it had a chance of going lower, after i trimmed its "legs" down to the height of the SOC ( and the wifi chip that seem to be the same height )

So now my T3 Guts look like this while i frantic look for some form of thermal paste here.

IMG_20200709_215945.jpg


I have also trimmed the tongue off the heat sink, cuz with it in place it rest on one of the connectors for the cameras so it cant rest flat on the EMI shield / SOC.
So me and it had to part,,,,,,, but we are still talking.

IMG_20200709_215934.jpg
 
kamkar1 said:
First of all i would like to thank my sponsor Dremel for sending me absolutely nothing, and second the Technical university of Denmark for teaching me absolutely nothing.

So using my Dremel knockoff ( not even a proxxon ) and a bucket full of good intentions i set sail on the high seas of dashcam modification.
After realizing that the SD card slot, and the two connectors for the cables was higher than the soc ( stand 1.7 mm tall over the PCB )

So first i cut the EMI shield so it had a chance of going lower, after i trimmed its "legs" down to the height of the SOC ( and the wifi chip that seem to be the same height )

So now my T3 Guts look like this while i frantic look for some form of thermal paste here

I have also trimmed the tongue off the heat sink, cuz with it in place it rest on one of the connectors for the cameras so it cant rest flat on the EMI shield / SOC.
So me and it had to part,,,,,,, but we are still talking.
Click to expand...

It'll be interesting to see how this works. You have the EMI shield contacting with the with the SOC. Do we know if that EMI shield is metal (Tin, etc) or aluminum? Copper and aluminum have the best heat dispersing capabilities. So if the EMI shield is aluminum, it'll do quite well. Otherwise, I wonder how it will fair with SOC --> Copper plate---> Shield --> Heatsink. As the copper will draw more heat from the SOC than ordinary metal.

You'll notice Tin generally has a poor thermal conductive rating, and steel is about 2/3rds of copepr, etc.

https://en.wikipedia.org/wiki/List_of_thermal_conductivities
 
I forgot to say, as the heatsing still reach in over the "tall" memory card slot, i of course had to shave some of the heat sink on that corner.
 
HonestReview said:
It'll be interesting to see how this works. You have the EMI shield contacting with the with the SOC. Do we know if that EMI shield is metal (Tin, etc) or aluminum? Copper and aluminum have the best heat dispersing capabilities. So if the EMI shield is aluminum, it'll do quite well. Otherwise, I wonder how it will fair with SOC --> Copper plate---> Shield --> Heatsink. As the copper will draw more heat from the SOC than ordinary metal.

You'll notice Tin generally has a poor thermal conductive rating, and steel is about 2/3rds of copepr, etc.

https://en.wikipedia.org/wiki/List_of_thermal_conductivities
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Maybe you should get some sheet copper and make a copper version?
The original is probably tin plated steel.
 
HonestReview said:
Do we know if that EMI shield is metal (Tin, etc) or aluminum? Copper and aluminum have the best heat dispersing capabilities.
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Shield seems to be tin or aluminum since it is not ferromagnetic .
 
kamkar1 said:
First of all i would like to thank my sponsor Dremel for sending me absolutely nothing, and second the Technical university of Denmark for teaching me absolutely nothing.

So using my Dremel knockoff ( not even a proxxon ) and a bucket full of good intentions i set sail on the high seas of dashcam modification.
After realizing that the SD card slot, and the two connectors for the cables was higher than the soc ( stand 1.7 mm tall over the PCB )

So first i cut the EMI shield so it had a chance of going lower, after i trimmed its "legs" down to the height of the SOC ( and the wifi chip that seem to be the same height )

So now my T3 Guts look like this while i frantic look for some form of thermal paste here.

View attachment 52560

I have also trimmed the tongue off the heat sink, cuz with it in place it rest on one of the connectors for the cameras so it cant rest flat on the EMI shield / SOC.
So me and it had to part,,,,,,, but we are still talking.

View attachment 52561
Click to expand...
Any idea of how you plan to clamp down the Heatsink, so it won't slide off on its own by gravity?
 
EGS said:
Shield seems to be tin or aluminum since it is not ferromagnetic .
Click to expand...

Based upon a google search, and trying a magnet, the EMI shield is aluminum. A metal with very good conductivity.

So it'll be very interesting to see @kamkar1 's results from shaving down the shield and making it directly contact with the SOC.

Check your metal by applying the magnet test again if you suspect that the metal is aluminum. Aluminum and tin can be mistaken for one another, but tin will stick to a magnet while aluminum will not.
 
EGS said:
Any idea of how you plan to clamp down the Heatsink, so it won't slide off on its own by gravity?
Click to expand...

Thermal paste is like a glue, should harden and hold the heatsink in place.
 
HonestReview said:
Check your metal by applying the magnet test again if you suspect that the metal is aluminum.
Click to expand...
That is the reason I said what I said, that it is not ferromagnetic. I have already tried that with a magnet a few days ago.
 
HonestReview said:
Thermal paste is like a glue, should harden and hold the heatsink in place.
Click to expand...
Some do not dry. You won't be able to pull it straight up but it can slide fairly easy...
 
Here's a thought, and someone might want to test this one. Buy a copper sheet as @Nigel suggested, tracing it out in the same manner as the aluminum one. And use that as the EMI shield instead of the aluminum plate. Mounting CPU direct to that instead.
 
HonestReview said:
FYI: Copper is still the best material to use
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I'm well aware of that, but I don't have a copper sheet nor do want to fabricate the lid with it since I don't have the tools to fabricate it properly.
 
I am pretty sure the EMI shield are ALU, at least it is not magnetic
 
As you might have noticed there are some kind of filter on the cooling vents on the side of the case, it is so fine masked you will need a fan to get any air to pass thru it, so i have removed it in my T3
 
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