Thanks for this Master of Biscuits.
A few questions:
1) Where exactly does the wire for USB go for the scenario of aftermarket LCD with stock charging port?
2) Do you have any tips for removing Q502's resistor without damaging the PCB? Same for removing the resistor on the Adafruit. Th
1) Not sure I understand the question, could you explain a bit more about what you're trying to do? Aftermarket LCDs can be powered from the Powerboost board, the USB input for the Powerboost should go to wherever your USB power is attached to the console.
2) Q502 can easily be removed with a soldering iron, just add flux and a bit of extra solder to the large end, hold for a few seconds, then put your iron across the pins on the other side. Just keep getting heat on there and it will just slide off in no time.
The resistor on the Powerboost is a bit trickier, ideally you need hot air. If you don't have one, add some leaded solder on both sides and use a large iron tip to heat both sides at once and push it off. Shouldn't be too difficult, the hardest part is actually getting it off as the board is so crowded.