Chosen Solution
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
Those two lines are part of the I2C bus. You will want to check them to insure they are not shorted. I would also look at pin B1 of U1502. That is the Hardware Enable pin. I don’t know enough about the internal logic of these IC’s to say what could be causing this.
I fixed so many backlights specially on 6 and 6s. Normally it’s filter But recently I d given iPhone 6s with very low backlight Checked all caps, filter, diod, coil etc. Everything seemed fine so I changed backlight ic(u2040) no luck And than I changed main pm ic and problem has gone.
