V18-MDU5 Destroyed and replaced,Entrance door cylinder malfunction

"I have the key, but the cylinder won't turn"

It seems like a general malfunction. I tried to wash the cylinder, but it turns around 45 degrees to the left and right, but it doesn't move at all. Even if I check the warped state of the door, I can't confirm anything abnormal. The door won't unlock when I pull or push it.

I try to unlock from the door scope, but the thumbturn does not turn. When I checked with the camera, I was able to confirm that it was still not moving.

It ended up being cylinder breaking and unlocking. The dedicated hole saw works comfortably. However, even though the 30mm cutting progressed, it was not completed. The end was completed with the appearance of a rotating file.

The deadbolt and strike malposition could not be confirmed, but the cause was unknown.

After unlocking, it was completed by replacing the set while repairing the screws.