MTH Z4000 Major issues

Sounds like an internal short.  Once you hit a certain voltage, the current will flow proportional to the resistance of the short.  If it's not doing this until you get up around 9V, the short might not be a dead short and could be transformer winding.  That would be difficult to repair I think.

It might be, could be the power fets failed on that power board and is shorted.  G

would it be worth repairing ? cost wise ?...and where and who to send it to for repairs...and are parts available to repair it ?

@trainnerd posted:

would it be worth repairing ? cost wise ?...and where and who to send it to for repairs...and are parts available to repair it ?

Simple stuff first, open it up and look for obvious, once you take a look report back on what you see. If possible snap a picture

he opened it up...everything looked good...disconnected the display wires...reconnected them....still doing the same thing. checked to makes sure wires weren't to close or touching. tried it again....no change...done that 4 more times. on the 5th time...it now works ..like it should....should he trust it ? I told him to take it slow....maybe with a test track..before hooking it back up to his huge layout...with his TIU

If it is a Power FET I have repaired before, long time ago.  If the board is defective or transformer, not sure parts are available anymore.  Will look, but they were usually repaired at MTH and only a select few tech allowed to get parts.  Shipping is expensive probably.  G