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Hello, We need more information to solve this. Offhand the number "7" is not relevant".
Right now, tell me if the remote works the converter box (tuns it on and changes channels ON the box)?
Also, what exactly happens when you try to turn on the TV- is there a blinking light on the front of the TV? Does it turn on with a "No Signal" message?
What is the model number off of the back of the TV?
What is the model number of the Zenith converter box?
Please elaborate with these details so we can proceed.