So, if you happen to have a multi meter with Diode mode, set and test the mini led that is on other side of reset button. Ground probe at the rear, my guess is for starters that green led is dead. Testing will result in a value but the led will not lite. Yet testing the one on ethernet side *Red* will lite. My guess is that it is clamping to ground.
So I might have made a mistake lol but without making sure I had a camera for testing. I have over a dozen 841s yet only 1 is like yours and before verification that I had a second one of like format I blew up my camera in same format as yours lol.
Why it matters. Well I wanted to confirm if camera was good but I am not sure it is or isn't because connecting the camera to another 841 that works I don't get a picture, just a white screen. So not sure if the cameras being different year format if camera might be wired different.. I tested it on 3 different 841s all older with diode protection as the picture I posted above. Anyway all resulted in white screen only so either camera is dead or need a 2018 version for better testing..
What I did find so far is that the led has died..again seems only green side as the red lites. Outside the led I don't find anything wrong with the circuit so far. But I also have a bad input so will change out the connector with just some wires to my power supply. When I connected my bench power supply to the camera the 12v dropped to 2.5v and 3amps. So should have killed something that would show but didn't. I have a replacement led so will replace and see if that restores camera. I have it all apart seeing wanted to check camera, nothing looks damaged on there so might just be led.. if I can remove the led without damaging it I will install and let you know. Keep in mind the led is very small and would require a micro tip like my fm-2032 t30-D06 or I or J on my HakkoFx951 it might be very difficult to replace. Normal handle with c1 tip might work if a tip you use often. Picture shows normal solder most people use on left lol and the one on the right I use most often and you can see how small the led is compared to the 2 solders.
Testing all other boards the green led lites but now that I killed the camera same way as you say you did at this point only fault I can find. Will report back after replacement. My issue is not sure if it was glued down and if it was the removing would damage most likely and not sure where to source a new one. Using low melt solder is best way to remove but with out datasheet hard to know it's heat tolerance.
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Be Safe.
