Hi guys, why my phone suddenly cant turn on?

Troubleshooting I did tried
- open the battery and put it back
- let it charged near half day
- discharge by holding power button for 5 minutes without battery and put the battery back
- charged the battery by using external charger
- replace with new battery
- disassemble whole components and put it back
- checked usb port, ok no problem
- connected to computer, no driver detected
- tried boot into odin and recovery, no avail..

I noticed the LED indicator wont show up during charging like usual. Did it bricked already?
Never root or install custom rom.