Thread: Zx81
View Single Post
Old 21st Apr 2020, 11:33 am   #253
SiriusHardware
Dekatron
 
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,482
Default Re: Zx81

I take it the burned pad is one which has no tracks connected to it on the lower side of the PCB? Those are the ones most prone to being burned off, because there is no track to conduct some of the heat away.

There are three aspects to each solder hole on a double sided PCB - a pad on the top side of the PCB (which is OK here) a pad on the underside which is (presumably the burnt one) and a hollow tubular conductive sleeve running through the hole, connecting the bottom side pad to the top side pad.

As long as the top side pad and the tubular sleeve are intact you should be able to run solder onto the pin and it will run down inside the tubular sleeve and connect the pin to the top side pad and anything which is connected to that.
SiriusHardware is online now