my fluorescent tube choke

[Sekemiat KE]

In my fridge I have a fluorescent tube that helps in the lighting of the fridge. I have problem with the kind of the operations am getting from the lighting system. I have checked all the part and i have realized that they are working well except for the choke which has a problem. I even dont know how i test the functionality of the choke although from observation it has some black smoke. Help me out to see the solution.