RCA ColorTrak FMR620WR (CTC-130A) From 1986

[colectorad]

This 25" tabletop set used to be my grandparents basement TV:



It's seen a lot of use over the years and attracted quite a bit of dust:



The flyback anode is shoddily zip tied to various yoke & neck board wires, leading to arcing:



I've since spread the wires apart by using a paint stick. This reduces the arcing noise.

On the main board, R506 & (to a lesser extent) R417 had charred solder joints:



I presume that this is due to the solder pad/trace being too small. I made sure to resolder/reinforce them.

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As for other issues with this set:

1.) The top left corner convergence magnet was broken off and is missing (likely from a previous "servicing").

2.) The convergence is off in general. I presume the adjustment magnets are under the zip tie on the CRT neck. Can anyone confirm?

3.) The picture is shifted down and to the right. There are no centering potentiometers on this chassis. Has anyone installed their own?

4.) Stereo speakers without stereo circuitry. Does anyone have the schematic and/or the theory of operation for the stereo adapter?