I managed to get the video working on A/V output of Raspberry Pi 3B+ (I got Raspbian) by removing hdmi_force_hotplug, but I cannot get the sound working even though I see one soundcard responding to the `cat /proc/asound/modules' andspeaker-test -c2 -twav -l7 -D plughw:0,0' commands. What could it be: a bad RCA contact (but the video is OK), low voltage on av/rca sound outputs (the voltmeter does show it is above 0 and is probably at millivolts), or something else? Is there some other setting in config.txt that can help sound appear on av output immediately?

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