Hot MOSFET blown?

Need help pls ,switch charges normal of usb via pc or say phone adapter etc,when I put in official AC the charge symbol comes up like it’s charging but discharges the batt very quickly and there is a buzzing noise coming from the MOSFETs area and one seems to get hot very quickly,have replaced the mostfet but still the same out come

Near fl1

Can u post videos on here sorry new to this

Thanks for any help