S6 Edge+ no fast charge + not recognised by PC
I have an S6 Edge+ that is not fast charging and won’t get recognised by any laptop/PC. It will only charge via wall charger and also by my laptop/PC. Even though my PC/laptop can charge the phone, it cannot recognise it is connected. It doesn’t see the device. This is the same in Odin mode. This means I cannot transfer files or flash firmware.
Based on the troubleshooting I’ve done, it’s looking like a mainboard issue. I’ve verified it’s not a charging port issue as I moved this board over to another S6 Edge+ I have (that has a different fault). The issue followed me there. Only thing I changed is the mainboard. So the issue must be somewhere there.
My question is: what can cause this problem on the main board? What should I look for on the board?