My Nokia Lumia 800 speaker has no sound, I just played a music on my nokia lumia through bulit in speaker, after a while, the sound on the speaker stop but the music is still playing but no sound. I run the diagnostic but still it produces NO OUTPUT.
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I've had this sometimes after disconnecting my earphones. Just connecting/disconnecting the earphones a couple of times solved the problem (earphone jack issue?).
i think this is a hardware problem because when i press the area in between the start icon and search icon the sound comes out again and later on a no output comes again. I decided to send it to Nokia Care and the repair is on process.