Is there gold on the motherboard of old unused / broken computer and phone? How can this be collected?

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Conductors are used to supply power to any electrical appliance. 

Insulators are metals that can conduct electricity, which means they have low resistance. 

Gold, copper and silver are the most transmitted metals. 

Rupa is the best conductor among them.  But gold and silver are scarce in nature, so they are very expensive.  From this point of view, copper is readily available and cheaper than gold and silver.  So copper is used to conduct electricity in all kinds of wires that we see and in almost all circuits.

 Yes, it is true that some connector pin / socket gold was used in the circuits of older devices. 

Of course this is still done but less so.  And the gold used in the circuit is not 100% pure.  However, the reason for using gold instead of copper is that gold does not undergo oxidation or rust.  Again, its quality does not change when kept in the open.

Gold is commonly used in connectors for expensive components.  A good example of this is the processor pin and processor socket connector on the motherboard.  Gold is used to ensure that all the pin / points of the processor are properly connected and the power supply is uninterrupted, plus that there is no oxidation of gold after years.

The amount of gold in the circuit / motherboard is very low.  The amount of pure gold obtained at the end of the extraction process is very small.  The extraction process is also quite complicated.  A variety of tools and chemicals will be needed to make it work.

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