Phone wont charge, even after replacement parts

my z981 stopped charging one day so i replaced the battery, it continued to not charge, so i replaced the charging port itself and got a different charger. still nothing. both battery and port brand new not pre owned,

sometimes it will randomly charge up to 20 percent but most weeks it wont even charge to even 3%

is the issue the motherboard? what do i need to do in order to get it to charge?

ive restarted it a million times, no updates required

one time it charged to 50% but that was like the day of getting the new battery but never again which was like 2 months ago or so

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