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My dummy ( 18193 )  does not respond to programing or TMCC commands.  The sounds come up whether in command or conventional but the unit will not respond  to any TMCC commands nor can I program the unit.  After a hunt I found a replacement R2LC receiver but that didn't work.  The antenna is connected so I guess that just leaves the mother board.  Does my logic seem right or am I missing something?   What would you suggest?  And if motherboard is bad does anyone have one for sale cheap?   Thanks Art

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It's so unlikely to be the motherboard I have some difficulty even saying it's possible.  First step, check the R2LC in a different engine and make sure it's fully functional.  Check the replacement as well.

If something happened to the MB traces, there should be evidence.  If all else fails take it out and examine both sides.  Any broken trace would be easily repaired, no need for a new motherboard.

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