I am trying to fix my friends Tab 4 SMT230NU. It powers on just fine, but when I try to restart from the power button. It shuts down then never powers up again. I took the back case off, removed the battery for 10 minutes then plugged it back it and it powers on. As long as I don't choose the restart option it will power on and off just fine. I did a hard reset, clear cache, then reboot thinking that would fix it but being that a reboot is the same as restart I get the same result. It does the system restore. I tried OTA to the newest firmware which fails at the reboot. Tried Kies with the same result. Non-Rooted Tablet. I tried ODIN with the new firmware, which worked on another 230nu tablet, that was stuck in a boot loop, but no luck with the one Im working on for my friend. Screen is cracked could that be the problem? Is the motherboard just jacked? Loosing hair over what I think should be a simple fix.
xda-developers