try to enter download mode or recovery (google)
if you can't access these crack your phone open and try to reconnect every cable
also check the boards for damage junk or whatever dosen't look normal
does it respond anyhow if you power it up? vibrates? sound comes out?
try to check the baterry (multimeter >3.2v<4.2v) (or on other phone) since SGN3 can't boot of charger
there are Million things that could &&^& itself up
if you have 2nd SGN3 (friend of family maybe?) you could check all boards (just switch the boards arround and check which one the problem is
anything that i can think of may be some thermal damage (overheat) or maybe some junk is inside
phones just don't die for no reason
it could be as easy as battery and as hard as broken trace
after your research let me know what you found (if board damage -> post pictures)
oh and btw. try to check your boards with 10x or so lens (50x would be awesome but i don't think you have any (i have only 30x))
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