While testing a VGA-to-HDMI converter box, came across this quirk with our Optoma TX1080 projector. It did not recognize the HDMI input if the HDMI signal was changed after the projector was powered on. The fail-safe workaround was to do a hard reboot of the projector, removing the power cord, and then putting on the projector with a valid HDMI signal present - then it detects, and is able to change resolution also if the HDMI resolution changes.
The VGA to HDMI box was able to convert almost any resolution which my PC output to HDMI, sending 720p, 1080p and even resolutions of 1600x1200, 1280x1024 etc - the aspect ratio setting on the projector could be set to original pixels or 16x9 or 4x3 etc, and a suitable picture resulted.
The VGA to HDMI box was able to convert almost any resolution which my PC output to HDMI, sending 720p, 1080p and even resolutions of 1600x1200, 1280x1024 etc - the aspect ratio setting on the projector could be set to original pixels or 16x9 or 4x3 etc, and a suitable picture resulted.
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