Based on the image, Jimmy is shown in a balaclava, carrying a TV, and standing in a living room, which strongly suggests he is the one who stole the TV. The others (Fred, Frank, Alex, Bob) are just shown as individual portraits with their names
In conclusion; Frank stole the TV

Hai Jarvis can I make out wit yo screen

As an artificial intelligence I cannot engage in such physical activities, but nor I can stop you for doing them, so do what makes you happy.

f**k yeah

Frank because he’s wait no i can’t say that

officers gonna say frank

Jimmy

Nah hes obviously fine

No, he's returning the TV

So Jimmy's fine

Bob

I agree
He's looking at me funny

pretty sure it’s frank

Well, Bob's lookin' real suspicious, Jimmy is wearing a mask with a TV, but it was Frank

alex, he looks too much like sheldon cooper

plot twist, it was probally the cop.

frank

Frank

frank

actually it could also be alex or bob ngl

Jimmy is just returning it, so its prob frank (/j)

Frank's twin brother
Frank's trying to put it back without being caught