Hi folks, first post here of probably several. Loved pinball when I discovered it as a boy in the 80s but only just got my first machine, a 1989 Williams Police Force. There are a few issues I need to sort out with it, some more significant than others, but to start with I'm tackling this one which seems pretty straight-forward.
This machine has had all the lights replaced with LEDs and some other updates. There is a lamp on the playfield under the "10K" middle ramp space that doesn't light. I did lots of tests and found that a known good bulb will not light there. Closer inspection showed what I *think* is a solder joint that came loose, probably while moving the machine across town to my place. I've included some photos. The area where the connection looks bad has some coloured smear around it, distinct from all the other joints. My guess is that this is flux (?) and an indication that this connection has been soldered by one of the previous owners, and that might be why it broke loose, as it was not as solid as the factory connections.
My plan is to try to re-solder this connection, but what I'm unclear of is whether the circuit is exposed enough there that a new blob of solder would fix it. Looking at the area that has come off, it doesn't really seem like there's metal there. Is it possible that when the connection separated, it pulled some of the connective material off the PCB as well? Would it be a good idea/bad idea to sand or otherwise remove the discoloured stuff (flux?) from the area before I attempt to re-solder it?
Sorry if this looks plain as day to seasoned pinheads. I've never tinkered with too much electrical stuff (I'm a software programmer by day) and want to use great care before doing anything potentially impacting to my first table (of hopefully more to come).
PS: I declined the suggestion to link this post to the game in question because I think the particular game is not really relevant to the subject, but if the SOP on this forum is to link them even in a case like this, please let me know and I'll adjust that in future threads.