[V700 only lasted 2 years in service]

22 hours ago, kratmel said:

"I am familiar with the V700 PLC circuitry and I can say that there are no electrolytic capacitors in the circuit that age even without operation.

During the whole period of using such PLCs, I observed two cases of V700 failure. One due to problems with the external power supply. Another was injured due to the accidental supply of high voltage to the + 24V circuit of the pressure sensor which was connected to the V700 PLC Snap-in I/O. I was able to successfully repair both PLCs.

At the same time, I observed the failure of a completely new V1040 controller on the board which, as a result of improper storage in a damp room (in the off state), oxidized the conductors on the board.

The only thing that comes to mind about your problem is external influences. I know what a closed air-conditioned control room is. In automatic mode, everything is fine. However, when a person goes there - he temporarily turns off all air conditioners and usually forgets to turn them on after maintenance. The result is overheating of the equipment, emergency stop or alarm - switching on the air conditioners and heat shock in the equipment."

I have gone through all the un-bricking procedures with no luck.  There has never been any connector or snap on IO changes while powered up and it  was in a secured area where no casual access was permitted. Environmental control is automated, but also monitored and trended. If it were to fail we would be notified immediately.

It looks like I just got stuck with a lemon that i can't turn into lemonade. 🤕

When examining the circuit board I found U601 (RFP 56512) to be too hot to touch. It looks like it may supply power to U500  FPGA (Lattice LFE2-6E 7FN256C-6I) as that IC is also very hot. I removed U601 and then U500 did not get hot, but probably because it now had no voltage source. 

I suppose I could replace both of those ICs and hope it doesn't go beyond them. Would be really helpful to have a schematic, but I seriously doubt that would be available. So at this point I have nothing to lose replacing components as it certainly is not covered under warranty .  It may take a ride in my reflow oven as a last ditch attempt at revival.

[V700 only lasted 2 years in service]

I was afraid of that.  I'll try the un-bricking procedures and see what happens. I guess at very least I now have a spare display for the other 3 v700's I have running.

 

[V700 only lasted 2 years in service]

Has anyone had a problem with the V700 having a very short MTBF?  I bought one in 2017 for a project that was mothballed for a couple years, so the v700 sat in its box unopened.

Two years later the project was picked up and the unit was placed into service, in an environmentally controlled computer room with whole room UPS protection. The system ran fine until about 4 months ago when it went completely dead.  it was still drawing power, as the back of the unit was warm, but no display, no Ethernet, and no USB communication. 

Unitronics supports response to my support request was this:

"Thanks for reaching out to Unitronics Support. 

All Unitronics units come with a 2 year warranty. Unitronics does not offer parts or repairs. "

Their only recommendation was to contact sales to purchase a new unit.  

Has anyone else experienced a short MTBF on a unit that was not exposed to a harmful environment? Is it assumed then that the  unit self-degrades while still in the box?

I would have thought that Unitronics would have stood by their products more than this.  Guess not!