I dont know if you are the same guy but I think I got the answer here on this post on reddit:
XC6204B282MR from Torex Semicondutor - from mouser part and datasheet
It seems to be a very low power high speed LDO regulator.
If its not this one...
Sorry for revive this old thread about this mod, but I just wanted to share a solution for people who has the AGS-CPU-01revision
On this revision you need to Lift the PIN 34 of the screen connector (its responsable to power the front light...