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I love to disassemble and repairs things and there are some defective DSLRs on eBay. I see that there some people who actually buy them. Im pretty sure that there are people who buy these and try to repair them. I would like to know where they could have gathered their knowledge from. I cant find much about it on the internet. And what about third party repair shops? What kind of experience do they ask their employees to have? How do they learn to repair cameras?

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    Sorry, this is too broad; but often the reason people buy up 'broken' electronics is they hope to cannibalise several broken ones into one working model. They don't usually 'repair' anything, they re-assemble working components & discard the broken ones. – Tetsujin Mar 14 at 18:49
  • Take a look at Make: magazine and maybe play with an Arduino board. You could learn a lot about electronics and circuit boards and sensors starting with that. – osullic Mar 14 at 20:46
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Mechanical film cameras are a good place to start learning camera repair because they were usually designed for hand assembly and contain simple electronic circuits if they contain any circuit at all. And mechanical systems can often be understood by looking at them closely with an experienced eye.

Modern camera electronics are often beyond repair for practical purposes because the electronic components are often complex, proprietary, or simply unavailable as working order replacements. Moreover, their workings are opaque. How an IC works can't be readily determined just by looking at it.

A modern digital camera with mechanical issues might be a reasonable candidate for repair. But it would take experience and detailed knowledge to make an informed judgement that a camera is likely to be repairable. Or that it contains parts to repair a similar camera with a different problem.

Camera repair is mostly going to be learning by doing. It helps to work alongside experienced experts, but that's probably not going to be an option. Buying some cameras and trying your skill is probably the first step.

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