Hi @stoutscientist
Having some of the appropriate tools e.g pry tools, drivers etc and a wrist strap is nearly essential to avoid ESD damage to components, and also an adequate DMM (digital multimeter) and knowledge of how to interpret schematic diagrams to aid in fault finding at board level is probably a good start.
One golden rule to live by when repairing electronic devices is Power Off first, On last. This means disconnect all sources of power i.e. external and internal as soon as possible/accessible before beginning a repair and reconnect only when the repair is completed or if power is required for testing purposes. This eliminates the potential for causing more electrical problems during a repair, than what may have been there in the first place.
Mechanical damage possibly caused during a repair is another matter. If something isn't going right e.g. won't disconnect, come loose etc., stop and think about it. Walk away if you have to. Don't rush headlong into trying to get it resolved as you can cause more problems
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