Product review (4 stars): It worked
One day, my four-year old LG LDF6920 wouldn't start up - no LED lights, nothing.  I did some troubleshooting with the help of the LG service manual and Google University, and it appeared that the main PCB was the problem.  I bought this item, replaced the old one, and thankfully the system powered on again.  The item arrived in a few days and the revision on the board matched the specification on the order.  It's a bit expensive, but hopefully the machine holds up for a few more years.