Have you disassembled any game consoles?
I personally have taken apart the following:
PS4 - fix (see below)
PS3 - fix ylod
PS2 - fix disc drive, fix open/close button
Xbox 360 - fix rrod, install RGH
Xbox - mod or swap disc drives
Comment what you have cracked open and why you did it.
The PS4 was I weird situation, my dad bought a new PS4 and out of the box it wouldn't work, all it did was turn on flash a blue light and turn off. He threw the receipt away and Fred Meyer would not return it so I took it apart, cleaned the heat sinks and put new thermal paste on it and put it all back together hoping that was the problem. It's ran great ever since.
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I had to take apart a WiiU gamepad so I could replace the thumbsticks and sell it.