What was found
LAS - AIR TURN BACK - FLT 0726 - ON CLIMB OUT OF LAS EN ROUTE TO ORD THE WEATHER RADAR DISPLAYED WX R/T IN RED AND QUIT PAINTING WEATHER. TURNED BACK TO LAS. MAINTENANCE R&R THE WEATHER RADAR TRANSCEIVER IAW AMM 34-41-33-401, AND THE WEATHER RADAR CONTROL UNIT IAW 34-41-12-401. OPERATIONAL CHECK WAS GOOD, TESTED WEATHER PATTERNS ON RAMP, ALL INDICATIONS NORMAL. VENDOR BENCH TEST OF WX RADAR RT S/N 4953 CONFIRMED FAILURE OF UNIT FINDING THE 5VDC REGULATOR SHORTED. REPLACED INTEGRATED CIRCUIT A2A2U6 TO CORRECT 5VDC.