When there are faults in a PS4, how do you take it apart (as well as the controller and components) and fix them?
It's appreciable that you are capable to repair PS4.
PS4 units has been reported to be sabotaged by Foxconn workers.
Sony has also started to replace the faulty units. So,if you have a faulty unit,then replace it for free.
I found this and think it is the best so far:
there are several guides for disassembling PS4 now concerning repair you can do more harm and if you seek technician it can cost you around 300USD?
Watch this Sony engineer take apart a PlayStation 4
Sony Playstation 4 (PS4) Teardown and Disassembly
PS4 Easy To Fix - Take Apart Guide