[Q] need advice please

Hi all and thanks for reading I just need some advice

I have this lg optimus p-769 and it was working recently untill my cousin decided to throw it because he was mad ever since it does not turn on

I have another lg phone same model and everything i used the battery from that one to try and turn it on and nothing

but what dose happend on the smartphone it seems to light up really quick every single time i click the power button everytime i click that the 2 menu button blink really fast and that it

beside that i am thinking it can be

-One of the 7 cables inside mustve got detached
-The usb port does not charge anymore although another battery should work
-Motherboard is dead
-currently i am charging it for like 10 hours to see if the phones probably couldve messed up the bios that tells it that it fully charged
-And the last thing I am going to do is switch pieces from a working phone over to that untill it finally works

if its the MOTHERBOARD where can i find one its pretty hard i searched google for ( lg optimus -p796 motherboard ) NO results

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