I don't like the usage of the word appliance in the off-topic close reason for poor repair questions:
"Questions on appliance repair are off-topic unless they involve specific troubleshooting steps and demonstrate a good understanding of the underlying design of the device being repaired."
According to Merriam Webster's dictionary: An appliance is:
"a machine (such as a stove, microwave, or dishwasher) that is powered by electricity and that is used in people's houses to perform a particular job"
A recent question about how to unplug cables on a computer motherboard was closed for this reason. The problem is, it's not really an appliance, and I envision the OP scratching his or her head wondering how we categorize these things.
Instead, I'd like to see a close reason for poor repair questions worded something like:
"Questions on the repair of consumer electronics, appliances, or other devices must involve specific troubleshooting steps and demonstrate a good understanding of the underlying design of the device being repaired."
Or the short version:
"Questions on electronics repair must involve specific troubleshooting steps and demonstrate a good understanding of the underlying design of the device being repaired.
Zebonaut's meta question about improving repair questions is a great reference.