My TV "as delivered" played through it's own speakers. If yours is doing that, too, your problem is not in the iRV stereo unit. If it is playing through the stereo, Hersbird probably has the answer.
(Sorry, I missed the "iRV" in your title in my last post, although you didn't specify model number.)
I've attached two iRV manuals; they both refer to sleep timers.
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1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10
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