Well, I have tried googling the problem and the closeset thing to a solution was this post
https://www.eevblog.com/forum/thermal-imaging/flir-one-gen-3-how-disassembly-(red-light)/.Let's take it from the start. I have bought this Flir One Pro thermal camera used with what seller described as a faulty battery, and after I googled the problem (which seam to be a big problem that the camera don't charge correctly and damages the battery) I bought it hoping that it was just a simple battery swap that was needed.... It was not.
Got the camera, disassembled it, removed the battery, checked its voltage (which was 0.00V so dead), proceed to order a replacement battery (brand new unoriginal, measuring 3.89V) , got it delivered and installed and the camera just shows a solid orange colour light.
Tried following the official troubleshooting from Flir, that the camera should be put into a charger and be left for an hour then it should work. That did not do anything.
When it is plugged into a charger it only pulls 0.00A - 0.02A but if I hold the power button down so the orange light turns off (and still holding it down) it pulls 0.41A (which from this charger is what my phone pulls when I plug that in), but when I release the button it goes back to the orange light and back to the 0.02A pull.
Then I googled the problem and found that thread here on this blog and user "Fraser" wrote about connecting to the UART to see if the camera is totally dead. The thread was from December 2020 and the user "Fraser" has in his bio that he is inactive here on the forum.
So my question is, can someone help me identifying the UART pads and if someone have had any advice to revive this camera it would be great. I know I took a risk but it saddens me that it's totally dead.
I have some experience with soldering and have tried alot of microcontroller projects so I have a USB-UART "PL2303 USB-TTL/ USB-STC-ISP" but have never used it for anything, but resetting a e-fuse on a 3d printer (had a full guide for that).
Hope someone can help and sorry for wasting your time if any of you fell like that. Have attached pictures of the camera and the usb meter.