LGB Decoders & Sound Boards


This page is just some collected information on LGB decoders


The new MFX decoders are basically really a pain if you run traditional DCC. The first thing you should do is change CV50 to either 0 (DCC only) or 2 (DCC &  analog). Without changing this up front, many people have experienced erratic operation, and erratic CV operations.


There was a single function available. Don't know where on the decoder it is. C

CV51 - sets to F1 to F8 for this.

Some more information from Dan Pierce:

- V1 (labeled "LGBE1_V1," rare, only few made): Don`t connect smoke generator directly to the function pins, but use relay as shown in instructions. (I never found the 'LENZ' instructions)
- V2 (labeled "LGBE1_V2"): Connect smoke generator directly to function pins (no matter what the instructions say).
- V3 (labeled "LGBE1_V3"): Same as V2, but using different electronic components.
- ME1-1 (no "V" number, sticker with a serial number): Same as V3, but advanced functions can be programmed.


older LGB decoders (55021 and 55027) do have standard features and have manuals.
The onboard decoder does have standard connections but cv's are preprogrammed differently.


CV 106 is the number for the factory load on these decoders.

CV51 - f1 output as in 55020

 73 - small single motor porters are
129 - Unitah mallet, and Coke Mogul, and most American steamers with the 2 motor board
146 - American trolley and F7, and most American 2 motor diesels
148 - Track cleaner loco



55040 - 2 function relay board, could be added to 55020/21



LGB sound board.


model 20252

part number 8.837010.1