Chosen Solution
Hi, I changed battery on my iphone 6S plus and after this the phone can´t boot. When I plug DCPS to the phone it hangs on 0.20 mah. I have tried replacing Tristar but this didn´t fix the issue. Any ideas ? thanks Edit: This phone was bought “for spare parts”, because it didn´t turn on. Previous owner changed the battery because he had to charge phone twice a day. He didn´t remove display so there is no long screw damage. After replacing tristar the draw after prompting to boot is everywhere from 0,05 to 0.40 mah. There are no power rails from PMIC present apart from pp1v8_always. It is recognised by iTunes. I´m still learning so that´s why I buy broken phones trying to fix them. This one is headache. Measurements taken from board ( no display/body ) around PMIC and main rails: WHAT / WHERE / VOLTS / DIODE PP_BATT_VCC / TP02 / 1,22 / 1287 PP_VCC_MAIN / C2120 / 1,23 / 1286 PP5V0_USB / C2310 / 0 / OL PP_CPU / C2000 / 0 / 025 PP_GPU / C2011 / 0 / 025 PP_SOC / C2022 / 0 / 021 PP_FIXED / C0750 / 0 / 067 PP1V8_SDRAM / C2132 / 0 / 252 PP1V1_SDRAM / C2130 / 0 / 225 PP_CPU_SRAM / C2070 / 0 / 076 PP_GPU_SRAM / C2080 / 0 / 183 PP1V1 / C1243 / 0 / 247 Does low Volts on the main power rails means there is a short on the smaller rails ?
If we put together the no image at all with the original owner not having removed display when replacing battery, on a 6S we get a pretty high chance that the backlight circuit is the problem you’re facing right now. Try to shine a torch in a darker environment at boot, if you can see a very dimmed image the backlight issue would be confirmed. It might be involved a filter if you’re lucky or any other backlight circuit component in the worst scenario.
