Each buyer is diffrant so what we tell here might not be true to your buyer, just bring what you have and tell them that your new at this and ask them what they want. Yes broken low grade (brown) boards are ok. I take transformers,heat sinks,ic chips and copper off my brown boards but only brown boards. Power supply boards are called power boards and most buyers will pay a little more for them if they are intact. It's up to you as to how you want to do that. Don't be afraid to ask questions when you go that's how we all started out.
Bookmarks