Only refer to the solution below and find the marked points where the button is connected.
Nokia 2690 ON-OFF Power Key button Track, Jumper Ways Solution
You can power clean keyboard matrix including the membrane keyboard protection. You can then connect to 100 Ohm resistor and a diode. Also check the resistance and the diode for any damage, replace if necessary. Hope this can help in your Nokia 2690 Power Off key problem repairs.
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