Charging problems even after changing power (sister board)

The title sums it up, here is what I tried.

  • I tried replacing the battery of the samsung a31
  • I tried replacing the charging board
  • I tried letting it charge for half a day on multiple chargers.

Before this I also replaced the screen, right now it boots but doesn’t charge (only a small part of the charge remains)

I am out of ideas, is the sister board that I ordered faulty?
Is the flat cable faulty (if that is the cable that charges the phone), I attached a photo of it.
Also where can I find datasheets or summaries of what every cable/component does for phones.
I’ll attach detailed pictures of all the components… I really feel out of ideas, what am I missing :( ?

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