An apparatus for repair of a defect in an electrochromic device comprised in an insulated glass unit, the apparatus comprising: an optical imaging means for acquiring an image, a laser means for emitting a light beam capable of ablating material; a means for moving the light beam within a repair range; a control means adapted to control movement of the light beam within the repair range to ablate at least one layer of the electrochromic device along a continuous path surrounding the defect or inside of an area defined by the path; the apparatus being characterized by a mounting unit being moveable across a support surface of the insulated glass unit and including means for mounting the mounting unit to the support surface of the insulated glass unit to fixedly position the mounting unit; a position indicating means for indicating a position at which to fixedly position the mounting unit relative to a portion of the electrochromic device including the defect to be repaired; and an imaging and repair assembly which includes the optical imaging means, the laser means, and the means for moving the light beam, wherein the imaging and repair assembly has an optical imaging range and the laser repair range, and further includes means for moving the optical imaging means to acquire an image from within the optical imaging range, wherein, when the position indicating means is attached to the mounting unit at a predetermined alignment position with respect to the mounting unit and when, while the position indicating means indicates a location on the support surface aligned with the defect, the mounting unit is mounted to the support surface to fixedly position the mounting unit relative to the defect, then the portion of the electrochromic device to be repaired is within the imaging range and the laser repair range when the imaging and repair assembly is attached to the mounting unit at a registration position with respect to the mounting unit. an optical imaging means for acquiring an image, a laser means for emitting a light beam capable of ablating material; a means for moving the light beam within a repair range; a control means adapted to control movement of the light beam within the repair range to ablate at least one layer of the electrochromic device along a continuous path surrounding the defect or inside of an area defined by the path; a mounting unit being moveable across a support surface of the insulated glass unit and including means for mounting the mounting unit to the support surface of the insulated glass unit to fixedly position the mounting unit; a position indicating means for indicating a position at which to fixedly position the mounting unit relative to a portion of the electrochromic device including the defect to be repaired; and an imaging and repair assembly which includes the optical imaging means, the laser means, and the means for moving the light beam, wherein the imaging and repair assembly has an optical imaging range and the laser repair range, and further includes means for moving the optical imaging means to acquire an image from within the optical imaging range, wherein, when the position indicating means is attached to the mounting unit at a predetermined alignment position with respect to the mounting unit and when, while the position indicating means indicates a location on the support surface aligned with the defect, the mounting unit is mounted to the support surface to fixedly position the mounting unit relative to the defect, then the portion of the electrochromic device to be repaired is within the imaging range and the laser repair range when the imaging and repair assembly is attached to the mounting unit at a registration position with respect to the mounting unit.