@mistera I tried but could not determine which chip. There are 2 five-pin, one 3.3v reg and the other the battery charge controller.
Try poking around their GitHub here:
https://github.com/Xinyuan-LilyGO/T-Display-S3

https://github.com/Xinyuan-LilyGO/T-Display-S3/tree/main/schematic

https://github.com/Xinyuan-LilyGO/T-Display-S3/blob/main/image/T-DISPLAY-S3.jpg