I do exactly as you describe. I hand-drill-out the via plug (it's just green resist, as far as I can tell - fairly soft) and then scrape the copper from the via annular ring on the underside of the board to make an (IMO) mechanically superior fix. This method works fine for vias under components too. I use 38 SWG 'Roadrunner' wire, where the enamel melts at about 420C, so turn the iron up and solder directly through that - the result is that the green enamelling makes the repair more subtle, and saves using an overcoat pen which rarely matches the original resistor colour anyway. After such repairs, I replace the components using my usual method of soldering pin-by-pin; no drag soldering for me, and certainly never hot air reflow.What's the best way of fixing the connectivity between the pads and vias ?
Normally I'd use a very thin wire soldered between the device leg and via, but as I'm assuming there are vias under RP16 and IC33, I'm not sure that would work as I replace the devices.
If you have spare fresh parts to hand, use them, as it's certainly not unusual for those two to die with battery rot.
Statistics: Posted by IanJeffray — Sun Dec 29, 2024 9:11 pm