Repair via to other side of board?

[bjf]

Does anyone have any tricks for accessing and soldering to a via where the pad is gone and you're only left with the microscopic dot of a line going to the other side of the board? Running a wire to the other is not an option for this repair because of the positioning of the damage.

 

[2informaticos]

If is true hole, you can use CNC bits (0.1-0.2mm) to clean the hole and pass the wire.
If not, you must find another point in the same line, and run wire.
Use UV curing resin for protection in such case.

 

[bjf]

Thanks, it's not a hole so I'll have to figure out some way to run wire. The problem, as always, is how delicate the connection points are. Any movement of the wire on a 201 resistor will pull it off.

 

[2informaticos]

As I said, use UV curing resin to fix it.
0.01-0.03mm enameled copper wire is recommended.