In Microsoft Nokia Lumia 535 power button is soldered on the motherboard just like the volume keys. Power button is used to turn on and off your mobile phone and is placed on the right side of the mobile phone just below the volume keys. It is almost a fragile part because using it roughly can damaged it and if that happens there is good chance that the prints below the power button might also get damaged.
So if your Nokia Lumia 535 power button is not working to repair it you just need to replace it with a new one. If the prints of the button are damaged then you are going to have to make the jumpers as shown in the diagram.
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Here is Nokia Lumia 535 power button not working repairing solution. Please study these diagrams very carefully before you start repairing.
Nokia Lumia 535 Dead Does Not Start Solution
Nokia 535 On Off Button Ways
If the Nokia Lumia 535 On-Off key may not working, you can trace its connection line paths as shown on solution above. Just apply a jumper wire if the line tracks is open or cut.
Check all the components that are surrounding your Power IC, if any of them is found to be faulty then replace it, as if any of the component is damaged then your Power IC won’t turn ON.
If all the above methods fail to resolve your power problems then all you have to do is to gently heat your Power IC with the help of a heat blower, if it fails to perform then re-ball and re-fix the IC.
If heating or re-balling of Power IC doesn’t do any good to you then replace your Power IC, as there is nothing you can do besides all that.