Контактная площадка - official,

Jega писал(-а):
I don`t know how to say on russian- place on mobo under BGA chips where balls are soldered
"Контактная площадка" - official, "пятачок"/"пятак" - slang.

Here you can read about repairing footers.

Jega писал(-а):
Can mobo work without this R20 (according to datasheet its HI7)?
HI7 - on M20:). On R20 - VRMPWRGD. Both signal is needed for mobo functionality.