Solved! Connecting AVR to Smart TV

Aug 25, 2020
Hi there, its my first forum post. I own a Pioneer VSX-425 AVR and I want to hook it up to a Samsung Q70T which unfortunately only has a Digital optical output. I have tried the following based on forums I have read around the internet:

AV to HDMI Converter
Coaxial/Toslink to RCA Converter

The AV to HDMI converter did not work, while the Coaxial/Toslink to RCA showed some promise when it worked for a few minutes until cutting off. When it cut off, my speakers had a cackling sound. For this, I used a Toslink cable from the converter to the TV. I also set the TV's audio to PCM.

Here's the manual that shows the back panel of the AVR:

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