Here is how to switch to VGA channel, or other channels:
1. press "menu" button, the menu should pop up.
2. select "VGA" by pressing the up and down button
3. press "right" button to confirm, it will switch to VGA channel.
Since it design for Car-PC without showing OSD on screen when switching channel, so sometimes people though the monitor is not working or can not switch channels. Sorry for the confusing.
Next time, if you have any questions, you can also send email to firstname.lastname@example.org. Enjoy and have a wonderful weekend!