# What verb should I use for someone who 'deal with' internal circuits very well?

I couldn't find out what verb should I use when I want to say

He was good at dealing with machines, and also he could even 'verb' television internal circuits by himself.

In my language, 'manipulate' is the verb we use (when we literally translate it into English), but I'm not sure if it's an appropraite use in English as well, so I also came up with 'work with', but I guess it's too broad and unclear. Or how about 'design'? can it also be an option?

To sum up, when someone 'manipualtes' the internal circuits by him/herself very well, what verb can be used? Is 'manipulate' also work in English as well? or what else can be used?

I probably would not use the word internal there either. The circuits are only inside the television, so it's not needed, and it sounds odd.