Two more questions that I would like to make clear. Are those round lead circles, right beneath rectangular connectors, can be used to restore the lost contacts? I tried to ring the ones that are still in tact with a tester, and in fact, they are connected.
And the other one is why the tester rings when I put one tip on, let's say 2nd rectangular contact, and the other one on 7th. Should not they be different traces?