Wireless controllers would not sync with Xbox 360 and the power light would not come on.
The repair went well except for the Spudger tip broke almost immediately- very disappointed with that. IFixit guide was extremely helpful and assisted me in successfully installing a new RF Module board on my 360.
Don't be intimidated by changing the RF Module board in your 360 if you run into a similar problem. The IFixit guide is a very helpful resource.