My GT-I9192 device keeps rebooting to "GALAXY" logo, even when trying to go into Recovery Mode
That happened with me too, sorry, but your phone is probably bricked. I fixed my S3 by purchasing an un-bricking device off ebay/Amazon. They look like so:



(If your phone is rooted, make sure you have the right root file (International or For a carrier) I corrupted mine because I had the international root file when my phone was sprint.)

Hope this helps!