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imagei have had a dcs setup for over a year now I bought it used and my proto 2/3 locos have grown I purchased a set of F7 set proto 2 put them on the track no issues running them on the 3 lap they came to a stop and my TIU stopped working the 2 fixed channels and variable 2 does not work the fixed 1 channels showed some melting at the post I opened it all fuses are intact i get power to fixed 2  but no dcs signal my remote says no train on track the loco does not move i tried several the fix 2 was not on when i had this issue only fixed 1 the melting is on the imput side of fixed 1 verable 2 works without any issues i get a dcs signal and power on the back it says I3 is there anything I could do to save it 

thanks

gpamikeh1@comcast.net

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Last edited by fl9turbo2
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You should find that posts have come loose. This creates a poor connection and creates heat.  There are a couple of recent threads on this issue with the details of the nut size.

The repair is to use two nuts (locking arrangement) with the internal connection between the two.

Change the title of your post to TIU post loose and case is melting and you should get the responses from those that have made this repair.

You can also search the forums and you will find the previous threads within the last 4 months.

Repair the posts and the internal connections and all should be fine.

Good Luck!

The problem was caused by the prior owner, not by your loco.  Looking at the picture, I see that there is no lock washer under one of the binding posts.  This means he/she had removed the nut, possibly having a problem. 

There should be a star washer against the plastic, as on the other post.  Tighten all the nuts.  On my TIUs, I have added a second nut with an internal star washer between the 2 nuts.  The nuts are metric, and the size is given in another thread.

 

First, look on the bottom of the TIU and see if there is a sticker with the letters "Rev" followed by a letter.  If so, what is the letter?  If no sticker, it's a Rev G, the original TIU, and it might not be worth putting money into.  However, looking at the picture, I do not see soldered connections; only the Rev G had wires soldered to the posts. 

So it's probably worth asking one of the expert techs their views on repairing it.  GGG has a top reputation.  So do Marty Fitzhenry and gunrunnerjohn, although I do not know if they do TIU repairs.  I think any of these 3 would give you their opinion on whether it's worth fixing.

I would not, repeat NOT, take it to a local hobby shop.

Last edited by RJR

George does do quick turnarounds.  That I can vouch for.  Sent him a damaged PS2 board and had it back in a week.

As to what you could do at home, that would depend on your proficiency with electricity and electronics and whether you had a VOM multimeter.  About all you could test would be continuity and do a visual.  If any components had failed, you would probably not be able to replace them unless a skilled electronics tech.

George (GGG)'s email is in his personal data.  I suggest you email him and seek his opinion.

well i spent most of the evening repairing the TIU i got it to work moved the ground wire and added a nut then replaced the wire and added a second nut and it fired back up i only tested it on a piece of 30" straight and a switcher every channel started to work i have to put it back on the layout and lets see what happens i also upgraded it to 5.0 the TIU was easy to upgrade but it took several tries to get the remote  to upgrade  not sure why it kept saying that it was looking for the tiu had to cycle the power several times  thanks again for everyones help i will buy a new one to replace it but for now i can run again

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