A panel assembly for a display device and a display device having the panel assembly are provided. The panel assembly for a display device includes a display region including a plurality of pixels and most of display signal lines connected to the pixels, a plurality of repair lines disposed in a shape of a ring in a peripheral region outside of the display region, and first to third auxiliary repair lines disposed in the peripheral region in parallel to data lines. An additional auxiliary repair line is provided at a right side of each of the data driving IC regions. By doing so, occurrence of disconnection and success in repairing the disconnected data lines of a display penal which is mounted in a COG scheme is tested by using a TCP type of test unit, so that it is possible to greatly reduce production costs involved in the COG type test unit.