With there not being any frost pattern at all, and with the compressor vibrating as if it is operating, this would be a sealed system failure. This could be a sealed system leak or a restriction. Unfortunately, an EPA-certified technician would be required for further diagnosis and repair.
As this could be caused by a few things sealed system related, including a possible compressor failure, the only thing I could suggest would be that an EPA-certified technician would be needed to proceed any further with diagnosis and repairs.