To have come apart (of things), (parts of s.t.) having come loose.
This radio is coming apart.
One cannot sit on this chair anymore; it is coming apart.
The chicken has come apart because it is overcooked.
To take s.t. apart, disassemble s.t.
Who took this radio apart?
He knows how to disassemble a gun.
He took the door apart because he hadn’t made it right.