Any way to fix a r2lc that when put on track it doesn't wait to program (or wait for the tmcc signal) it just takes off in conventional mode? i tried another r2lc in engine and it is fine...
thanks
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Probably not. The common issues of I/O triacs or the 5V regulator are easy to repair, but when the RF section goes I normally declare them as a total loss.
Obviously, you can look them over to see if there's any obvious physical damage. I have had a couple where the small cap in series with the antenna connection was missing, those were fixed with the addition of a suitable .01uf 0603 cap.
ok thanks...
One question on that rf "section" going bad... is it possible that it is related to the 2 chips i have circled in the picture...I know this is probably a ridiculous question...but can you take them off a like a switch controller and replace them on the r2lc? or probably there is much more involved???
thanks
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Check the small cap at C1 right at the top edge of the board away from the connector on the back side. I've had a couple of boards where that was knocked off and caused no signal reception. As I stated, it's a .01uf (10NF) cap.
Those two parts are involved in the reception, but the LT455FU ceramic filter is quite delicate and getting that off the board intact is a bit of a challenge. 
I did manage to get some off and revive a board, but I've swapped a couple of others onto non-working boards and that didn't fix them. Due to the amount of effort it took it wasn't worth it.
Of course now that the R2LC is really extinct, maybe it's time for me to dig out all the bad boards and take another look.
ok thanks...maybe i'll try it for the fun of it
