The display backlight is now DCDC3 (Reg 27, not Reg 28) I found values from 0X40 to 0X7F worked OK
LD03 is the vibration motor (I just disabled it at component begin)
The backlight would probably be better as a light component but I don't have experiece of configuring external components.
I do have a working version of axp192.cpp if it helps