DM is no longer available from Mitsubishi.
Unit can be removed and sent our for repair----
PTS ELECTRONICS---you will find them on the web and you can call or email for a quote.
Usually there are some caps and or fuses that fail in the DM unit.
Did you try to disconnect front keyboard to make sure it is not the problem?
If this told you something you did not know rate this solution as very helpful as I do this for free.
SD TECH
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