Sofirn kindly sent the IF24 for review a few months ago.
It seems like a decent upgrade over the IF23.
Here is my review:
Goodness me, Sofirn are plugging this one hard. Absolutely no disrespect for your review Tim, your posts are always informative, but this must be about the fifth IF24 review I’ve seen here.
Thanks for making it non YouTube 
1 Thank
I actually received this in March, a few days before visiting China, and then I spent a month in China. I finally got around to reviewing it. Since then they’ve come out with the Pro version 
The Sofirn IF24 suddenly stopped working so I did a teardown. It would not turn on while using an 18650 cell but it worked when I connected a USB-C power supply.
There might be a connectivity issue between the driver and the ground. The tube is used for the ground connection but it stopped working.
I tried to heat up the glue under the frosted glass for the side emitters but I ended up smashing the glass.
I soldered the driver wires back onto the copper MCPCB with a Luminus SST40 emitter.
The board for the side emitters has a connector with 6 pins to attach to the main board.
The driver has an FMD (Fremont Micro Devices) microcontroller.
There was plenty of thermal paste but I removed most of it while doing the teardown.
My Sofirn IF24 stopped turning on while using a battery. I tried using another 18650 battery and I tried powering it from a bench power supply.
It still worked when I connected a USB-C power supply. So I decided to see if I could fix the connectivity issue (with the ground).
I desoldered driver wires from the MCPCB, and then I desoldered the copper MCPCB from the main board. The main board has two prongs that stick through an aluminium shelf and through the copper MCPCB.
The other side of the main board has two prongs sticking into the board with a spring. And there is a 6 pin connector on the main board for the side board.
The only way that I could think of removing the driver at this point was by removing the frosted diffuser, unscrewing the side board, and then by disconnecting the side board via the 6 pin connector.
The frosted diffuser ended up being made of glass. I thought that it was plastic and I chipped a bit off a glass off while trying to pry it up. I then tried to apply heat but I ended up smashing the glass off.
I ended up getting the driver to work off a bench power supply by connecting positive to the spring and ground to the USB-C outer sheath.
There might be some connectivity issue with ground… I haven’t identified where the connection failed. Perhaps a screw was used to connect ground through the MCPCB, into the shelf, and onto the main board?
4 Thanks
WOW that’s pretty helpful, I’ve sent it to the engineer to see if he can find the reason, thank you so much for the effort 
2 Thanks