Chosen Solution
Some ic from the logic board are missing right next to the dock connector cable and the iPhone easily heats up and drains very quickly even in sleep mode. Am wondering if it’s the U2 ic or the ic’s that are broken off is causing the problem. And when the battery is fully drained the battery doesn’t charge. and mic also doesn’t work
A quick look at the pictures and the schematics show the components missing are part of the primary mic and hphone. I would definitely start with a detailed visual inspection of the board for other missing components
The u2ic is located on the rear of the board under a shield if you are referring to a tiny component near the dock connector it’s more than likely a resistor or capacitor… A picture is worth a thousand words
If you’re going to chase this far enough down the rabbit hole to replace an IC, I’d definitely start by replacing the known damage on those components you showed us in the picture. Get a parts board and just pick them off and place them on with heat. If the problem persists then I might start chasing after an IC, but that wouldn’t be where I started for sure.
