k-line engine not working

The questions are a bit too "off" to be clearly understood. 

My guess is either you are trying to be short and quick, (which many new folk, including myself at one time, tend to do)

OR spellcheck/predictive text changed things and you didn't notice.

Either way, I'm sorry, but I couldn't even take a good guess as is 

I had lights and audio before I took all pc boards off mother board put back together and now nothing I know the dcdr board is bad,,,, question is what powers up lights and audio

when I first checked train it was on running track had lights and audio,, no movement repaired burnt trace on mother board put back together,, this time with new dcdr board and went to test train this time I used my spare zw trainsformer   on test track checked voltage at track was ok coudnt figure out why every thing didn't work now took train to running track worked ok …...found the tfmr had red light removed installed one now as I increased power the red light got brighter found bad connection in tfmr going from circuit breaker to common repaired all ok  ……….reinstalled the old dcdr board and it was bad

Some of the K-Line stuff had an undersized trace on the motherboard that was prone to being cooked.  If you examine the bottom of the motherboard, you may find your problem.  The lights are powered from the R2LC, the audio is from the audio power board.  The fact that all of them are out indicates a common power problem.

As for the DCDR, I have some of those, send me an email and I can fix you up with a cheap one.

This document might help in your troubleshooting.

TMCC-RailSounds Board Pinouts.pdf

thanks for pinout document,,   have a Merry Chirstmas