screen shows full battery but won't charge

when i connect the charger the screen tells that the phone is charged 100% i press the power button and goes into bootloop

if i don't plug it won't show life

i tried to change battery - no power

i tried to change charging port - no power

i tried to remove all the connectors of the camera microphones and the bottom sensors and to power it only with lcd and battery again no luck

i thing i broke it because i tried to change the main camera and i forgot to remove the plastic part from the motherboard and the motherboard was band at first it worked for about 20 minutes and turned off and i got this problem now

but the motherboard doesn't look damaged