The condenser makes laud noise when turning off

Sounds like you are getting liquid back to the compressor. Is it the compressor making noise or the fan?

The fan does not look like touching anything. It is a rattling sound. The technician has replaced the part that seemed to have shor-circuited and his explanation was the bugs may have caused the short-circuit, but it did not solve the problem. Now the sound is little bit different but still very loud.

Does it make the same sound when it starts?

No