TypewriterKing wrote:
...but I can tell you this, overheard by an older television repairman: You start unsoldering and soldering parts, you're going to be fixing on the unit for the rest of its life. When a part becomes weak, it will weaken other parts, and when that weak part is replaced with a stronger part, it will continue to weaken the parts made weak by the originally weak part.
I don't know. I am sure he believed that and it may be true for the human body (at least the musculoskeletal system), but not sure about electronics. Sounds like a rationalization for the loss of in depth troubleshooting skills and the tendency to replace entire subunits. Or maybe it's just statistical correlation - when one component fails, others are probably near their end of life. But my one experiment with serious auto repair did end just that way: with a friend's help I pulled off the cylinder block, took it into a shop to have the valve seats (?) reground, put it back together, and... miraculously it worked, and it had stopped burning oil! Woohoo! For a few days anyway until the better compression blew the old cylinder rings. Also my last experiment with engine repair.
This was an older car and a long time ago - with today's motors you would be a fool to attempt disassembling the complex spaghetti engineering encapsulating the old brain motor. We are still burning gasoline in a reciprocating internal combustion engine so there has to be a cylinder block under there somewhere, but easier to junk the car. No user repairable parts inside.