well ur fucked , that switch can go to the donor selection.
the max is not fried,replace it and u will see
the issue with no sd screen working but if u insert sdcard u get a black screen.
i bet with u if u put the Ums Loader on the Sdcard and rename it as payload.bin ur gonna be able to boot the ums loader.
ClickMeForUmsLoader
Now this is the fourth or fifth time i heard this happen and all have installed some kind of Hwfly chip or ali board .(im not saying Hwfly is Bad Just putting it out there)
Ive had a Oled with the same issue (no BlueScreen) the guy who sent it to me tried to install a Hwfly Chip and had that issue.
ive tried everything to get that thing runing but it was a wast of time and so have the others with the issue all ended up as a donoar board.
so Lucky u now have a free Donor Board Xd