How to Troubleshoot & Replace Frigidaire AP3967975 / 134149220 Speed Controller Assembly

I determined that it was most likely the motor or the speed control board, but had read that the motors are less likely to fail, so figured I would try the speed control board first. 1. Unplug the washer 2. Turn off both of the water supply line valves (if you don't do this water will get everywhere) 3. Disconnect the water supply lines from the washer with a pair of channel lock pliers (hold a towel or rag underneath the connection when you unscrew to catch the residual water) 4. Remove all the black, Phillips head screws that were holding the metal back 5. Lift off the back and put it aside The speed control board is to the lower left when looking into the back of the machine. 6. Disconnect the two plugs to the board 7. Unscrew the two Phillips head screws holding the board down and lift it out (there is a small tang that the front that slides into on the base) Reverse the steps 8. Slide the tang of the board into the hole and attach the two Phillips head screws 9. Attach the two plugs to the board 10. Put the metal back in place with black, Phillips head screws 11. Connect the water supply lines (hot to the connection by the H stamped in the metal back and cold to the C) 12. Turn on the water supply valves (check to make sure there are no leaks) 13. Plug machine into wall 14. Turn on the washer and hopefully watch the tub spin and agitate. 

Followed schematic troubleshooting supplied with unit. Found blown fuse on speed controller. Replaced fuse and it immediately blew again. Measured board resistance and motor resistance per schematics. Determined the speed controller was the problem. Ordered and replaced. 

Took the back off unplugged the wires r and r the controler 

Super easy fix! After unplugging the laundry machine, just screwed off the back, screwed out the speed controller assembly (only 2 screws!), and screwed the new one back in. Plugged the machine back and tested it empty: worked like a charm! 

Took the back off the washer, unpluged the board, removed 2 screws 

Super easy. Opened the back. Removed the part. Replaced with new one. Closed everything up and bam washer now works. 

I checked the motor control board that Appliance Parts Pro had , read the other forms and that helped me solve the problem . 

Changed the Speed Controler 

Speed controller assembly 

After reading all of the posts on this site that suggested the same issues as my washer, I determined that the Speed Controller Assembly on my washer was the problem. I watched the video on how to remove the back panel of my washer and all of the components involved. I felt confident I could make the repairs with the new component. The part shipped the next day with priority shipping and I replaced the part. My washer began running like expected and I was thankful for the assistance from this site. Thank you!!!