Lfhb2741pf0 board shorted by me :(

[Duckwize]

I have a Frigidaire French door that wasnt cooling in the refrigerator portion.  Freezer and ice maker were cold.  I was troubleshooting the evaporator fan, and checking the voltages.  I'm pretty sure I grounded the +12v.  The unit died instantly.  I now get a sy c.f. Fault.  Argh!  Pretty sure that was a costly 140 mistake.  

With that said the evaporator fan was not running.  The voltages I was getting were 12v on certain legs.  Until my troubleshooting was done due to grounding on a coil...I think.

The resistance shows 1.8k and 18k between red and brown and red and Blue 20k between brown and blue. 

Now I can't troubleshoot due to my oops.  Any thoughts?  Thanks

[Duckwize]

Sorry.  The resistance is 1.8k red and brown.  18k red and blue.   20k blue and red. Yellow acts like a signal, conditions change with the fan

[Rob Fowler]

At this point you may not have enough information to make a good determination of your original problem. I suggest replacing the board and use the tech sheet to put the unit into diagnostic test mode and check the thermistor, damper motor function, fan and even the defrost circuit. But you will need a functioning control board to do this.

[Duckwize]

Hi Rob, thank you for that.  I was looking up the info on the dc fan, and realized that I need more than just 12 volts.  Gotta love electronics.  When I get this up and running, do you think there is a service manual for said fridge?  I searched, but it wasn't specific enough.  

Again, thank you for the help!  

PS just purchased the board on repairclinc.  Should have the board tomorrow to start tests.  

[Duckwize]

Rob.  I installed the new board when I got home.  We have a new issue.  The fridge does not power up.  It acts like its shorting out.  When I plug it in, the fridge powers up for a split second and shuts down and powers up and shuts down.  So I put the old one back in.  The UI panel loads just fine with the old board, but of course the unit still doesnt run.  Just to the UI.    What do you recommend from here?  I just bought a 163 dollar board that is useless.  

[Duckwize]

I let it keep cycling once I realized it wasn't the compressor doing it.  It finally timed out and gave me the SY CE error code.  Still nothing lights up or hums.  The light on the ice maker can turn on and off though

[Duckwize]

After doing a little more tinkering, I am wondering if when I shorted out the evap fan to the coil, if I took out the UI board and hopefully not the main board.  It's seeming neither main board is able to communicate to the UI.  Both give me the sy CF/CE error.  The red and black wires from the ui have 14-16 volts when not connected to the board.  The white wire is the communications wire and that has continuity from UI to main.  I dont know what is suppose to travel on the white wire, but maybe UI isn't speaking to the main.  Originally I thought the main wasn't speaking to the UI.  Just a thought.  

[Duckwize]

To those that are interested.  The new UI board did not help the cause.   It turns out the ice maker 12vdc fan shorted out.  When I removed that out of the circuit everything started to run as should.  Yes, I needed a new main board, but that was the root of my issue this whole time.  I lucked out.  Now as soon as my UI board sells on EBay I'll be super happy.