Lorex DVR Lost one channel due to cutting live feed wire

Hi there, I accidentally cut my BNC wire while camera was stilled powered up. Now the single channel is blue screen. I have tried other (known good) cameras and power supplied and it will not work. I removed top panel from DVR unit hoping to find some type of fuse for each channel but there is nothing even resembling fuses. Just wonder if any one on here has any idea or tips on how to repair this situation. And also if you could enlighten me on how (if at all) these channel circuits are protected. Thank you.