theoretically it is possible to repair the solder points - but without seeing it - it's hard to tell
i use for "fired" solder points Conductive Silver - there are pens on the market - but i prefer the little bottles with a brush - even if i only need tiny lines - the bottle is much cheaper and i'm able to fix stuff that isn't fixable with the pen
if a solder point is gone - you can repaint it with the brush (or fin lines with a toothpick) - when the paint is dry - you can put the cable trough the hole and the try to fixate the cable with kapton tape, hot glue or something that would keep the cable in place - after you fixated the cable - use the silver paint to "connect" the cable and the painted solder point and let it dry - but do that as your last step - if the cable is properly fixated - it will stay in place and the contact will work properly
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