If that board is SCART-compliant and works with other SCART displays/devices, then it will work with the OSSC. Like with other consumer video applications, AV1 and AV2 need 1Vp-p (-.3V to +.7V) on all the video lines and sync. I believe AV3 requires the same for the video lines, but requires 5V TTL sync. Audio inputs expect line-level, so avoid feeding them amplified audio.
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