How to fix my projection tv JVC

JVC projection TV AV-48WP74 5 years old - AFTER SOME MINUTES THE PICTURE STARTS FLICKERING AND CAN HEAR A CLICKING NOICE IN THE BACKSIDE OF THE TV - SOMETIMES IT STOPS AGAIN (BACK TO NORMAL) FOR A WHILE AND SO ON >.. CAN SOMEBODY HELP ME WITH THIS PROBLEM - MANY THANKS - PAUL

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