"PHONO" is the only designated connection on a receiver that is literal and exclusive. Nothing but PHONO will work right on it and old-school turntables would require it to preamplify the tiny current produced by a Phono cartridge.
BUT, modern turntables like your come with their own preamplifiers, so they MUST be connected to a garden variety Line Level input like AUX (anything BUT Phono or it will overload).
"LP DOCK also has a line-level output for connecting to any home stereo with an AUX input"
As far as WHY your amplifier isn't making da music, that could be whole 'nother problem.
We'd need more details about it and the speakers to go there.
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