What was found
FT # 299, LGA-MCO. DIVERTED TO JFK. ON TAKE OFF OF LGA WE EXPERIENCED A STRONG ELECTRICAL BURNING SMELL. CONTACTED THE FLIGHT ATTENDANTS. THEY ALSO CONFIRMED THAT THEY SMELL IT THROUGHOUT THE CABIN; AS PER TSM 24-00-00-810-823-A PERFORMED DETAIL INSPECTIION ON A/C CABIN/COCKPIT/GALEY/LAVS NO SMELLS OR DEFECT NOTED. INSPECTED FWD/MID AVIONICS COMP. + LTV RACK NO SMELLS OR DAMAGED NOTED. DURING AFT AVIONICS INSP. FOUND VENT/ EXT FAN ELECTRICAL BURNS AND UNIDENTIFIED SMELL SO R & R AS PRECAUTIONARY REF AMM 21-26-51. OPS CHK GOOD. REF LOGPAGE #2645564-2 FOR ENG RUN.