This is going to be one of several problems. Very first think to check is fuses and capacitors. Then I would start with the power board. Check your voltages on the in and output side. If they are all good I would go to the logic board. That is the small board and pretty inexpensive. From there you have to go to the TConn, but I don't think that is it. The next step is the X and Y board. It is most likely going to be the Xboard. If you are not getting audio or video then you can unplug the logic board where it connects to the main board. If you get the sound upon turning it on with it unplugged then your logic board is one of the things that went bad. Most cases you will have to upgrade the firmware with your new boards.
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