Hi i am new here, and want to know if anyone can help me with an issue I have with my TIU. It is version L, had it about 3 years. Went to run the trains lastnight and TUI fixed 1 will not turn on the TIU. I moved all tracks to fixed 2 and powered the TUI in aux in and everything works fine. Fixed 1 keeps blowing the fuse on my MTH power brick. Any fixes? The fuses inside are good, checked that also.
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Sounds like the TVS is shorted.
John has you covered, it's typically the TVS.
Sounds like it might need a repair that will require soldering new components on. It could also be a FET or the TVS. Reach out to GGG or Gunrunnerjohn on the forum. Either can fix it for you if it's a component. What rev number TIU is it? Rev G also had a trace that would go bad and not be repairable according to Gunrunnerjohn.
George
gunrunnerjohn posted:John has you covered, it's typically the TVS.
Speak of the devil!
The TVS is soldered on, right?
George
Yep, it's a fairly large axial thru-hole device, there is one for each channel. You can easily find the shorted one with a meter, it'll measure a couple ohms or less in both directions, that's the bad one. it's possible to replace those without taking the board out of the case, which is a bit if a PITA.
BTW, it's not a FET as they're not in the fixed channels. 
Thanks for the replies, I will reach out to gunrunnerjohn. He seams to be near me.
you'll get off cheap the tvs diodes are less then a dollar. good luck!
Alan
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