Make sure that whatever input you are using on the TV (HDMI 1, 2, etc) is working (maybe try a DVD player on it?).
Another idea would be to connect the Hopper using one or more of it's other alternate outputs - it can do COMPONENT (R,G,B Jacks) or the old COMPOSITE (Yellow RCA video jack) to make sure the Hopper is working at all. Otherwise you could trying Googling your TV to see if there is any info out there.
FROM SONY HELP PAGE:
Re: Sony TV is not displaying picture or has no signal
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Sony wants your feedback!
http://bit.ly/WcYjMOIf you are receiving a no display or no signal message on your Sony BRAVIA® TV we will walk you though the steps to resolve this situation.
If you have any further questions please feel free to ask away. I will do my best to find the answer you
https://community.sony.com/t5/Televisio ... td-p/66861