Clicky

Jump to content
Click here to check out our structured, online appliance repair training courses for rookies and experienced techs.

FAQs | Repair Videos | Academy | Newsletter | Podcast | Contact

Stay connected with us...

Subscribe to our YouTube channel for lots of appliance repair tips and help! Subscribe to our MST Radio podcast to learn secrets of the trade. Sign up for our free newsletter and keep up with all things Appliantology.

Sign in to follow this  
Duckwize

Lfhb2741pf0 board shorted by me :(

Recommended Posts

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

Share this post


Link to post
Share on other sites

Need appliance parts? Call 877-803-7957 now!

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

Share this post


Link to post
Share on other sites
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.

Share this post


Link to post
Share on other sites
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.  

Share this post


Link to post
Share on other sites
Rob Fowler

So I'm not sure about a service manual but here is a link to the tech sheet which has instructions for diagnostic mode and does a decent job of giving you the pin outs.

http://manuals.frigidaire.com/prodinfo_pdf/Anderson/A01870701.pdf

And one additional note if you review the error codes on the service data sheet there is one for the Evaporator fan "SY EF" so if you are not getting that error I would start with other items first like the damper or thermistor calibration. But never rule anything out just because there is not an error code.

Share this post


Link to post
Share on other sites
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.  

Share this post


Link to post
Share on other sites
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

Share this post


Link to post
Share on other sites
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.  

Share this post


Link to post
Share on other sites
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.  

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.