Everything I have read says: don't do time outs and don't make their room a place of punishment. It should be their safe happy place. You can't punish a child for being upset. I found showing you understand and naming the problem really helps " I can see that you feel sad because you can't watch TV. I understand. That must be hard" Offer a cuddle with open arms. Even when they are raging at you, you will be surprised at how often they want this. If not, tell him you love him, are here with him and and are here when he needs you. At the end of the tears will come acceptance.