No backlight after unlock phone (backlight work during boot)
recently i repaired iPhone 6 water damaged.
I replaced PMIC, after then phone boot but there are not backlight and touch. I replaced:
- backlight IC
- backlight capacitors
- touch ICs - MESON, CUMULUS
- LCD IC - CHESTNUT
Now after press power button, phone boot with backlight and work normal. When i lock phone, LCD goes off, but when i want unlock phone there are not backlight. Touch and LCD work.
My question is:
Where can be problem? It look, backlight driver do not receive ENABLE signal after booting and do not want work.
Can be here problem with
For what is there this bus?
Sorry for my bad english :)