I came up the hard way using a Radio Shack soldering iron and a Radio Shack desolder bulb. when I was in my 20s I didn't really have limits on what I would muck with in the interest of fixing things. when I reached my 30s is when I started to formulate the process of trying to understand what I'm doing and why I'm doing it. in my 40s I have a wealth of experience lodged in my head and I usually know the right time and place for when and what to execute. now I have limits, I stick to what I know because it's actually more cost effective to pay someone else that knows what they're doing thoroughly to do it instead. I still take my job serious, but not to the point where I get stressed out. out of 1000 things I know how to do 997 of them. most people will appreciate the fact I know 997 things. then there's other people that want to knock me for not knowing how to do the other 3 things.
after telling you my partial life story about being a game technician, I would like to direct attention to one
@SCUBA King. I nurtured that lad years ago with my wisdom and turned him into a monster. he doesn't have limits. he just mucks with virtually everything and keeps fighting until he wins. he's my finest creation.
now I'll impart some wisdom in you. people are baffled when I tell them I wasn't formally educated in the art of fixing video games, monitors, pinball, and whatever else. I tell them "I learned by doing it", because I was placed in the unfortunate position that making 1/4 minimum wage in my family's business, I dedicated myself to making all games work at all times. so I got into virtually everything, there were many more wins than there were losses. and the losses I went back and kept fighting until I won. I did my K7000 videos the other day, I don't remember if I mentioned it (cause the whole routine was adlibbed as I always do it) but I learned how to read schematics working on K7000s. I also watched almost all the Randy Fromm's Arcade School DVDs. which he has posted a lot of that material on his YouTube channel:
https://www.youtube.com/@randyfromm
if you care enough you will want to amass all the knowledge you can. I'm not a scholar in electronics theory, but I would encourage you start there on Randy Fromm's channel. I don't use much of it in real world applications, so my brain interprets it as a place I can save some disk space by not dwelling on it. LOL
I hope this was helpful. I'll probably hate myself and want to delete this post later.