No backlight after unlock phone (backlight work during boot)

Hi guys,

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

45_AP_TO_PMU_AND_BL_DWI_CLK

45_AP_TO_PMU_AND_BL_DWI_DO

?

For what is there this bus?

Sorry for my bad english :)

Thanks

@refectio