What was found
(CAN) CMC ELECTRONICS RECEIVED DEFECTIVE CMA-9000 FLIGHT MANAGEMENT SYSTEM, PN 100-601951-503, SN 1091. RETURNED FOR REPAIR. THE FAILURE MODE REPORTED "SCREEN NOT INDICATING DATA, TOTALLY BLANK (SN1091). THE MAINTENANCE TECH CONFIRMED THE REPORTED FAILURE. THE CAUSE OF FAILURE WAS ASSIGNABLE TO A DEFECTIVE COMPONENT U45 LOCATED ON THE FRONT END POWER SUPPLY ASSY. HOWEVER, DURING INSPECTION IT WAS OBSERVED THAT A THERMAL PAD NORMALLY INSTALLED ON THAT COMPONENT USED TO DISSIPATE HEAT WAS MISSING. THIS MATERIAL WAS NOT INSTALLED DURING THE ORIGINAL MFG OF THE EQUIPMENT. CMC HAS INITIATED A ROOT CAUSE ANALYSIS AND WILL TAKE CORRECTIVE ACTION AS DEEMED NECESSARY.