Troubleshooting a computer-controlled compressor in an LG refrigerator

In this excerpt, we go over an interesting way to troubleshoot a compressor that isn't running. We use what we've learned about inputs, outputs, and algorithms to figure out how the compressor is controlled.
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[@maxtaxplusdotnet]

🙌

[@robertmunguia250]

So what goes in must come out?

[@AppliantologyOrg]

Not sure what you mean. Suppose the computer is looking for a particular DC voltage drop, something less than 5 VDC, across a thermistor before it sends out 120 VAC to a load. The board is switching out a 120 VAC supply based on a specific DC input it's reading from a sensor. So in this common case, what goes in does not go out.

[@robertmunguia250]

@@AppliantologyOrg I thought all electrical would be if you have power in you have to have power out to the loads and switches. Especially if there is a control board.

[@AppliantologyOrg]

@robertmunguia250 Remember we’re dealing with a computer (a software algorithm) which can be programmed to look for various conditions (inputs) before giving an output. Hence the thermistor example I posted. So you also have to know what kind of input the computer is looking for. It’s not as simple as “what goes in must come out.”