Only thing I pull are the ones from pic #2, (only from brown boards) because they are copper bearing, and they are easy to yank off. I've saved them up in a jar. Since then I have been more interested in electronics, and have learned more about them. Look up the part numbers on google, it will tell you what kind of transistor it is... audio amplifiers, voltage regulators, AC to DC rectifiers, etc.
The chips in pic 3, I leave on there, A: I don't know how to use them yet, B, harder to take off. C: I'm saving my green boards to sell to buyers, and they want these chips.
Of course take the transformers and switches off brown boards, they are fun to take apart and have copper. Big square black boxes on TV boards are relay switches, they have some value as components. I de-solder anything that looks complicated and is easy to take off, to save for future projects.
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