JVC RS400 audio lips sync issue on 24Hz


Hello, I have had a JVC D-ILA RS 400 projector for some time. It is not an outstanding projector. But it has a nice black level and colors .. But back to the problem ..
I have the impression that the 4K e-shift in the JVC RS400 works better when we set the refresh rate to 24Hz .. I have the impression that the image is sharper. If that's my placebo correct me :)
The problem is, when I switch the refresh to 24Hz, there is no synchronization between the sound and the picture. (the lack of synchronization can be seen in the conversation .. lips are faseter then sound) And the question is.. This is a problem of the projector, the PC to which the JVC is connected .. Or maybe the HDMI cable itself

I am asking for advice and help .. Regards

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