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Quick question,

Does anyone know how are settings stored in the TIU (channel settings, TIU number...) ? Like is it flash memory, battery powered CMOS (although I don't see a battery anywhere).



Since about 2017 the 5 TIUs in our layout have been rock solid, but now in the last 3-4 weeks something interesting is suddenly going on. Some of the TIUs are starting to forget their settings and every time we remove and restore power...

-Fixed vs. Variable settings on each channel

-Outputs on vs off for Fixed1,2 Variable 1,2

-Occasionally their number goes back to "1"

We never had to touch these before, now we basically need to go through each TIU and set these everytime we power down and back up, it's weird.



Anyone have insight?

~Adrian

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I'm not sure it's good in this case, it's likely it's one of the big chips that only a SMT rework house could replace.

There's an flash memory chip on the PCB (M29DW323DB) which is near the radio board. I assume this is what they use to store the settings in a non-volatile fashion. I could smuggle the TIUs into work and change that part pretty mindlessly with some modest SMT and hot air effort. The catch is ...  is there other stuff preloaded on there too? Like if I lift the part off the PCB ... What I'd worry about is something like

0000 to 00FF is preloaded with the bitstream/bootloader for the Xilinx Spartan FPGA that loads onto it when the TIU boots. Only done one time at MTH's manufacturer prior to the part shipping

01FF to 0FFF programmable settings the FPGA writes based on commands from remote/WIU/wherever

--> So if I lift the part off and replace it that 0000 to 00FF part isn't there anymore and it won't boot.

It does say it's good for 100,000 cycles but who knows

https://www.digikey.com/htmlda...1/m29dw323db-dt.html

Tricky stuff.

@Adrian! posted:

There's an flash memory chip on the PCB (M29DW323DB) which is near the radio board. I assume this is what they use to store the settings in a non-volatile fashion. I could smuggle the TIUs into work and change that part pretty mindlessly with some modest SMT and hot air effort. The catch is ...  is there other stuff preloaded on there too? Like if I lift the part off the PCB ... What I'd worry about is something like

Honestly, I have no idea where they store the settings, but that seems like a reasonable guess.  FWIW, I wouldn't expect them to store just those few parameters in a 16MB chip, I'm guessing the actual program is in there as well.

I replace that chip multiple times on Rev G TIUs that have lost ability to retain an address between 1 and 5.  So replacing it is no issue as long as you match it and memory size.  32 meg need a ground jumper on the early 16m memory boards.

I would say try a Factory reset of all your TIUs first.  I just repaired a set that the remote would not consistently talk to the TIU and several soft keys would not work, though others would.  A factory reset on this older Rev G set up did the trick and restored the remote to proper operation.  G

I'm to the point where I am ready to remove the TIU.  I have very few MTH engines now, waiting on the new TIU before buying more, so I may just remove it.  It gets annoying to reset the variable channel to fixed randomly.  Like I said this only started happening in the last year.  It also has been having issues loading engines as well and the serial port seems to have failed.  It is the original run of TIUs from when DCS was first announced.  I think it's served me well.

Last edited by MartyE
@rad400 posted:

If anyone has successfully resolved the issue of a Rev L TIU, variable port not holding its setting, please update this tread.  We are having the same issue at our club.  Some of the TIUs which had this issue were only in use for a year or less.

Thanks for any info provided,

Bob D

NJ Hi railers

I'll be a little surprised if this is easily resolved.  Sounds like the memory is forgetting the settings.

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