@maxplayz look at your logic board as a conglomerate of a bunch of different circuits. A NET is how the different components (capacitors/transistors/resistors/inductors/etc.) work together to create this particular circuit. Any manufacturer uses their own description, so there is not really a standard definition for them. Some of Apples "NETS" are easier to "translate" than others. Sometimes you have to work with it for a while to figure it out i.e. I2C is communication Bus (very simplified but you can research this further if you want to) TCON is the Timing Control as related to control of the rows and columns on your display and SCL is the Clock signal for the I2C communication bus.
Now what does that all really mean and is it relevant to whatever is wrong with your iMac. I use the NET function whenever I need to test a specific circuit to determine which component is in the circuit or, when I place jumpers to determine which components to attach it too.
There is a whole bunch of engineering going on with those circuits. To totally understand each and everyone of those will require more than Answers on here :-)
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