Chosen Solution

the phone was in a bad condition when I got it (smashed screen) so I decided to change the screen + the frame, ordered service pack and I got finished to move every component to the new frame. however, the phone is still not turning on. when I plug it to the battery, it vibrate once. still nothing. when I plug it to my computer it wont recognize it. I struggled a bit with the vibrator motor when I took it off from the smashed screen… maybe it’s faking the vibrate and I need to change the battery?

@tom9 always have a plan when trying to repair devices you have no history on. Something Like the Samsung flowchart would be a good way to start. That way your troubleshooting is organized and not all over the place :-)

Right above U7002

It’s either that the battery is screwed and needs replacing, when you were replacing the screen you may of damaged the main circut board, or that the previous owner has done something to the phone that has caused such damage to occur. that’s either caused by an extreme impact or some accident that has something to do with liquid as damage can compromise the waterproofing. I hope this is helpful! :-)