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It's an A1304ELHLK-TThere is no 1.23v there, it's 3.3v that is turned on/off 125 times a second. That switched voltage comes from U9. Post a pic of the damage, because your description of the problem is just all over the place.
Sorry, should be an X instead of K in that part number there - A1304ELHLX-T You can find them at DigiKey, Mouser and the like. Top connection is Output, connect to TP68Left connection is GroundBottom connection is VCC, connect to TP49
J8 on the 1708 MCU board has I2C and some I2S stuff on there, also has a 3.3v rail and grounds. The closest for a pinout I have for it is in the 1537 thread, the bottom board schematic, and that's all subject to change as it's not been verified. I never dug much more into that port than that.
Incorrect. It has pretty much the same outer shape as a miniHDMI connector, but that is a 19 pin connector. The one in the XB1 controller is only a 12 pin. I haven't gone looking for a mate for it, so hard to say what it is exactly.
If TP67 was pulled off the board then the RT line is now open and it wouldn't work. You can prep and solder to the via that is just below and to the right of it (directly under the T in TP67) and connect that via to U10p2 (U10 pin 2) and you'll get your RT back.
That pad does nothing, it'll work fine like that.