Found problem thanks! Learned another hard lesson last night! Thanks to all who replyed.

I would contact G here on the forum. One would need at least pictures to be able to answer what fried if anything.

Do you think the element could be touching the housing on the smoke unit?

Have you tested for shorts with your meter?

I wouldn't get another board in there until it's checked.

Thanks for the reply. This is very strange. I went back to the layout and the engine. Powered up the track then I turnd the smoke volume pot to the off position. Started up the engine and then hit the smoke on button and the engine shut down again. So apon next power up  I turned the volume smoke pot back to full and restarted the engine and hit the smoke on button only this time the engine did not shut down. I Then plugged the fan molex connector back into the top board. The smoke fan began working and the elements got hot and the smoke unit came alive working as it should. I cycled through low med and high settings also with no issues. I then shut down  track power and repowered the track again and restarted the engin again. Now the engine works as normal. I can turn the smoke unit on and off via the remote and all is back to normal. Engine is working fine. Still not sure what happened here. Maybe you techs can shed some light on what happend. I am so glad it is working now. I will run it some more and give it some track time with a load and see if it acts up again. If it does not act up again it maybe ok. 

It is called electrical magic when an indermediate issue has no apperant cause and seldom rears its head; and now appears fixed..

  Solid state componants can "forget" what their job is temporarily. Usually a power down for long enough for all power to dissipate fully allows the part to "reset".  Occasionally, the part forgets forever; cooked. This is a simple version of rebooting a computer and more common than you might think. The next time a modern device "dies", unplug it and give it up to 3-4 days before you write it off, it may never do it again.

  I've had a tmcc engine refuse to do anything but blink headlights for a few days, till it sat for two full days almost three. Then it was fine for about two years. The next time, I just waited for two days and it was fine again. Two more years no more issues.

Static alone can cause fun like this too.

Like it or not, electronics do unpredictable things at times. The percentage of the failures can still be low enough to justify a design's use.

The fan stop fet probably was damaged but finally went open after all the power cycles.  You can not test components even with DC source if they are still connected to the circuit board.  Your asking for problems.  G

I would say you got very lucky usually when you power up a smoke fan with the board connected you almost always damage the board that is a big no no!!

always disconnect the motor and then run with a battery just momentarily to see if the fan runs. more then likely your fan motor wont last to long ounce they start making a noise, and you know if I remember correctly they only cost around $6.00 from mth plus shipping!

Alan

Ggg is right, I did damage one of the smoke triacs on the board after all. After it started working agian I double checked the boards. Some one posted last night about them with pics only hours later it was gone or deleted. I do not remember who it was. Thank you whoever you are. That was the issue. I now need to find that part and have it replaced. deleted poster said it can be done. The parts are from digi key. If anyone knows or the poster who posted this info last night can provide a link to the digi key parts I would greatly appriciate it. It may be too small for me to solder on the triacs are very small and my eyesight is not what it use to be. If I cant fix this board I will need to get a new bottom board. Yes I learned another valuble lesson last night. Should have disconnected the fan altogether  I just wasn't thinking about that at the time. 

GGG  can I purchase just the bottom board for this ps2 3vlt engine? And if so how much are they?  Also are the engines sound files stored on this bottom board? It seem they are buy the look of the chips on it. I finnally got a labtop to do mth updates. I have updated my wiu,tiu and remotes,but not changed or loaded engine sound files yet. If the board will need this prcocedure I will try to do it myself. I need to learn that part of mth upgrades anyway. Thanks.

Guys I  decided to call my local mth tech I discovered I had near me about a year ago. I told him what I had done and apon his recomendation am ordering new boards. He loads the sound files and all I have to do is swap the boards. Easy pesy. I just send the old ones back to him. I use raymonds electric trainworks. Raymond is a great guy to deal with and is a certified mth tech. I now use him for my mth repairs because he is so close to me. he is only two hours away. If I need to ship somthing to him the shipping cost is low and I only takes a couple of days to get it back. If you live near kc missouri or the kansas border  I highly recomend him. He is very knowledgeable on all mth related stuff. He is  great on answering all my mth related questions. Also he is great at working out my issuses over the phone.  His prices are resonable too. The engine he last worked on for me came back working flawlessly. A shoutout to raymand btw. Rayman if you see this post thanks again.

Why would you give away the old boards with a $20-30 repair replacing the smoke control FET(s) would have fixed them?  Also, the power supply board is doubtless just fine, no reason to replace that one.

I don't know your tech, but I suggest you rethink the glowing recommendation if that's his solution to a replaceable part on the board.

John is right, it can be fixed pretty easily.  Also, you will fine that the smoke unit still works fine and even puffs with chuff.  Just not as distinctly.  And if this was in a diesel would not even be used.  G

Why would you give away the old boards with a $20-30 repair replacing the smoke control FET(s) would have fixed them?  Also, the power supply board is doubtless just fine, no reason to replace that one.

Maybe the person is not comfortable soldering on boards.

C W Burfle posted:

Why would you give away the old boards with a $20-30 repair replacing the smoke control FET(s) would have fixed them?  Also, the power supply board is doubtless just fine, no reason to replace that one.

Maybe the person is not comfortable soldering on boards.

Maybe, but there are plenty of people that can fix it for a fraction of the cost of new boards.  The question remains valid.  Also, only the processor board had bad parts, the power supply is almost surely just fine.  Do you routinely spend $60-80 to replace a perfectly working board with another identical board?  If so, can you tell me where you toss the old good ones?

Is spinning the fan at full RPMs, after oiling, really necessary? I just put the fan back on the shaft and spin it both directions with a tooth pic to work the oil in and test it, without the shell, on the tracks. Don't we want GRAVITY to work in our favor so that the oil gets DOWN into the bushing. Not CENTRIFUGAL forces that move the oil away from center. Just seems like an un-necessary step, waste of time, and danger to go through the trouble of spinning the fan with a battery.  

Dave, the only reason you might want to spin the fan is to see if the oil actually worked.   Truthfully, I keep a stock of motors on hand, and I replace them if I have to take them out.  I don't want to be back in there in a few weeks...

Maybe, but there are plenty of people that can fix it for a fraction of the cost of new boards.  The question remains valid.  Also, only the processor board had bad parts, the power supply is almost surely just fine.  Do you routinely spend $60-80 to replace a perfectly working board with another identical board?  If so, can you tell me where you toss the old good ones?

I am not too keen on trains with electronics, and generally try to avoid them.

With the help I've received here, I have been able to repair a couple of old Lionel sound boards, otherwise I have resorted to salvaging working sound boards from junkers.

In the world of locos controlled by electromechanical e-units, there are people who will replace an entire e-unit, rather than rebuild one that needs attention.