| uBGA problem...
1) this is the uBGA net (stencil) with open container of soldier paste,
2- soldier paste: written on lid : advanced quality, joint high density high immersion,
Its like in a solid form when cold, but when i heat it with gun or put soldier iron
into it it becomes a thick liquid.(paste) u can heat this in the tin forever it does
not seem to becomming soldier, when leave to cold it becomes hard again. |