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From some devices it is easier to salvage parts than from others. E.g. desktop PCs are designed to be more modular for the end user and individual parts are designed to widely adopted standards. So usually individual working parts from a desktop PC can be used as spare parts. In other devices, end user modification or salvaging is not promoted and reusing parts is more difficult, as they are more often bespoke for that particular device. For example, many televisions would have their own unique power supply and motherboard that could only be directly used again in that same model of TV.