Hi,
As per our communication, we thought to disconnect VUSB pin from input voltage pins (DVCC and AVCC) in order to check whether the voltage is getting dropped due to excess current or due to some other reason. During troubleshooting, we found that even if VUSB pin is disconnected from all other pins, the voltage we received over VUSB was same as earlier i.e. 1.5 V in this specific case. We then checked voltage on the input voltage pins (DVCC and AVCC) and shocked to found that they are also giving 1.5 V, even though they are physically disconnected from VUSB pin.
This points us to believe that the exposure of chips to humidity has permanently damaged them because of higher soldering temperature. However, to confirm the same, we will have to bake remaining ICs and then check if all of them are working as desired
Hope that we are on the right path
Regards
Atul Bhakay
