All power rails power up and down?
Just changed a backlight driver IC on a water damaged iphone 6s.
It was booting and showed image, just no backlight before that. before i changed the backlight driver ic i changed the diodes as well, also checked all other backlight components for issues. the driver IC was the last thing i changed before this happened.
Even removal of it wasn’t changing this new issue back.
I cannot find a short anywhere on all those other rails. Checked all for short and measured the voltage all go up to what they should have and power down again and repeat.
If i short such a line it immediately goes into shutoff and i need to prompt it again.
So i am thinking it is a IC with an issue but which one ?
Does a broken PMIC such things ?