1. Phone L535DS
  2. OS : W10M(10.0.15047.0-Fast Ring)

As we all know VolUp + Power combo is designated for taking screenshot and VolDown + Power is designated for launching Feedback Hub. But when I press VolUp and VolDown buttons simultaneously for three times, a strange thing happens.

  1. My phone vibrates three times.
  2. Then screen goes black for a very short interval of time.
  3. Then return to its previous state.

I'm unable to understand what my phone is doing and for what purpose this combo is used. I can't figure out any change or can't see any app launched.So my question is that what exactly this combo does and for what purpose it is used?

  • The only explanation I've found is this forum thread at Windows Central where people suggest it just does a display reset. Supposedly works on Windows 10 PCs as well, though it didn't on my SP3 when I tried.
    – Indrek
    Mar 14 '17 at 8:19
  • @Indrek I also searched and read many things like that but I was unable to find exact answer. Moreover it doesnot resets display for me but in fact nothing I can observe.
    – Hamza
    Mar 14 '17 at 11:44

the function performed after the volume up, volume down combo is simply a hardware diagnostic test called the "Tickle Test", Hope this helps.

  • Do you have a source for this?
    – RareNCool
    Mar 17 '17 at 16:59

It is indeed a tickle test (see http://forums.windowscentral.com/windows-10-mobile/409900-press-volume-up-volume-down-3-times.html ). If you keep pressing VolDown + Power you will do a soft reset.

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