I am sure this is a dead thread but just in case anyone finds it like I did, here is how I solved this problem...
I had a Samsung Galaxy S3 i747 with cracked LED screen and nonworking digitizer.
- I purchased a MHL to HDMI adapter, plugged it into my S3 to TV and could then see the screen.
- I had a OTG cable which I attached to my USB keyboard and to my S3, then I could type.
I could NOT have these two peripherals attached at the same time due to the connectors so I had to switch back and forth with nearly every click I made to make sure I was getting to where I wanted to go.
Some of the keys I used...
Phone keys still were operational
Back, menu and home
keyboard keys
Tab, Arrow keys, Enter, got me in most cases to where I needed to go.
I guess I could have used a USB mouse instead or with a hub, both, but did not think of it at the time. Nevertheless, hope this might help someone.