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With what you have done and the current state, the only thing I can think of is that you didn't put it back together properly. A disconnected cable is an obvious suggestion but I can't remember if there is a separate cable for the IR sensors or it uses the same as for the screen. Otherwise the IR sensors might not be positioned correctly. I've managed to do that one of the times I pulled a Touch apart.
Other than that, the only other thing is the battery. If it is flat, then the screen won't change, so make sure it is charged.
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