Chosen Solution
Hi! I have an iPhone 8 (Intel version) which acting strange. Phone boots normally!!! Connecting to DC power it draw instantly 0.145 A I checked thermal camera and shows heat spot near sim tray corner where you insert pin to open the sim tray. But there is no Components there. :) Also I checked VDD_MAIN line in continuity it beeps (probably short) Checked voltage on VDD_Main 4.1V it seems ok. In settings / About there is no MODEM FIRMWARE shows
The best clue for this is what happened to it before it lost the modem firmware? Water damage or drop? There are two IC’s you will need to look at, the Baseband CPU and the Baseband PMU. If it is a shorted Baseband CPU there is nothing you can do.
