LCD works perfectly but I have no power on the touch interface.
My understanding is that the touch controller is activated by the AP only when the screen is on: the AP tells the PMU to activate the PP1V8_TOUCH line which is required for serial communication and then the PP5V1 line is activated by the CHESTNUT power controller. My problem is that I have no power even when the screen is on. Of course I checked for shorts on both the lines and found everything to be in order.
Is my understanding of the power sequencing correct?
Any suggestions? Could it be an issue with the main PMU which doesn't activate the PP1V8_TOUCH rail?