One of my older TVs has no sound when I upgraded Plex Media Player to version 1.1.2 or newer. The PMP is running on Raspberry Pi 2 connected to the TV via HDMI cable. The TV model is Sharp LC-32D30M-BK.
I have tried different RPi (including RPi 3), HDMI cables and SD cards, all same problem. Everything is fine when I use them on other TVs.
The only solution for me right now is to downgrade the PMP to version 1.1.1 (luckily I saved a copy of the image file in my PC).