An organic light-emitting display apparatus includes a plurality of lines disposed to include crossing points where lines insulated from one another by an insulation layer cross. If a defect occurs at one of the crossing points, the lines may be shorted together and the apparatus malfunctions. A method of identifying a shorted crossing point uses a test light-emitting device that is disposed to correspond to the crossing point and to emit light when a short is present at its corresponding crossing point.