How can I play games from iphone 4 to tv?

I have a jailbroken iphone 4 and I bought an hdmi cable and a apple digital av adapter. I can play movies but I cant see the rest of my phone on my tv, the screen just turns black. I know you can play apps and see your phone on tv, ive seen lots of videos about doing this but it doesnt work with mines. what should I do? I cant return the cable or the adapter so is there a solution?

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