Haier L19T3 Owner's Manual page 19

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HDMI,Component,PC and USB. When the Preset
Source is set as TV,after entering the Preset
Channel menu,press to select the preset
channel,and the channel will be forcibly switched
to the preset one upon turning the TV on;When
the Preset Source is set as other signal sources,
the TV will be forcibly switched to the preset
source upon turning on. For example, when the
Preset Source is set as Component, theTV will be
switched to Component upon turning on; when
set as OFF, the preset function will be closed.