Good Stuff Marty !
How long did it take ? - One hour of your time !
Probably about 1/2 to 3/4 hour per chip, including removal, desoldering, cleaning with isocol, new socket, solder buzz....
I used my new station to solder too. For some reason, I didn't get as much flux (I think it is - brown stuff around solders) as I did with my old iron? Same roll of solder too? Temp around 380deg.
I don't rush pcb's at all, I like to take my time. Setup on the kitchen table, used my new weller PCB holder (an absolute must), bright lamp behind and slowly slowly.
Although most likely to be only the U20, whilst the board is out it was worth doing all four. At least I'll know when I put pcb back in if it fails again to look elsewhere....
