I took mine apart, both the wafer transisters were broken on one end, I pressed them down with my finger plugged it in and it worked again, I tried to solder them but didnt go so well, So i kept pressure on them and put a drop of superglue on each, worked for about 1 minute and stopped again, I think I might have wrecked it. I need to track down a pencil solderer
Thanks so much for this post.
My compass and temp had gone out and for a little while I could push on the whole thing and it would flicker on for a short period.
I took the whole thing apart, confirmed it was getting power, and was about to order a replacement and then I found this post. I had this exact problem but it was the resistor right beside the one you had to solder also numbered 510.
After a quick solder, it was back in and working.
Thank you very much!