to check this problem plug in charger and check if it is charging but can not power on it means it can be problem of power button.
remove streaker from board and clean all buttons with cleaner apply little heat with hot air and then check on off button with meter is there any continuity or value if not then make this jumper from inner button to the pin point that is shown in cell phone diagram given in this post.outer print of on off button is ground that can be jumper with any ground position.
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