Hi! Just as a comment, did anyone had that kind of problem?
uC is not found or easily losing connection while erase/program.
Everything is properly designed and soldered (even programmer pins are temp. soldered to board).
Every connection was checked and re-checked.
But this chip just will lost connection. Unless. I apply a pressure to top of its case.
A assumed bad design and poor soldering with first chip but after re-check (microscope, DMM etc.) and with next chip also behaving in the same manner - it just seems like the bad connection is internal in chip?
Is it even possible?
There is no problem with other pins (usb connection ect.)
Ps. second chip was treated like an egg and soldered by hand with caution.
Never had that kind of problem before, it really looks like bad solder, but no ...
