LCRX repair

Well, almost anything is technically repairable.  The question really come up if it's worth the effort. You can get a new one from Lionel for $38.

The one thing you can try is tuning the coil on these.  I have seen them out of tune, just like the old TMCC Command base and the older R2LC's with the coil.  Later TMCC receivers used a ceramic filter to eliminate tuning drift issues.  Dale Manquen used to have a section on his site about tuning the command base, the same applies to these units.

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You can also drop in an R2LC with a steam motherboard to connect it and have all the functions of a dummy unit.

Finding out what is happening on the RF side of those is not easy, I tinkered with some R2LC's years ago to try to revive them.  I managed to build two working ones from half a dozen dead ones, and unless I figure my time at about $5/hr, I would have been better off just buying new R2LC boards!

One of the dead LCRX boards was a replacement ordered from Lionel back in November. I've got some time so I wanted to see if I could get them going. I'll try the tuning pot and see if it helps. If not I guess they are trash.

What is the procedure for adjusting the tuning pot?

Since there is no audible feedback to indicate when programming is accepted like when programming an engine, how can I tell when or if programming is complete for this LCRX?

You can use the remote to toggle the lights on/off as you tune.  It's the same procedure as using sound, when the light stops responding to the remote, you're at one end of the tuning range.

Since there is no audible feedback to indicate when programming is accepted like when programming an engine, how can I tell when or if programming is complete for this LCRX?