Hello Nick, thank you for the guide.
My CanoScan LiDE 220 has started to introduce a line down the middle of the page when I scan with VueScan. Not sure if this guide applies.

I found the follow YouTube clip helpful:

https://www.youtube.com/watch?v=eHCf51Ay...

With the help of this guide and Youtube watch?v=eHCf51AytLM I was able to replace the onboard CR2032 battery in my DS413. Thank you.

I am still getting the dreaded flashing blue power switch light though, which is a different problem.

Without any HDD attached, the power light stays on, and the status light flashes.

Ming

I made the mistake of placing the I/O board behind the frame when I reassembled. I quickly found out my mistake. This photo was helpful.