Homepage › Forums › RetroPie Project › Video Output on RetroPie › HDMI only works on some Televisions. › Reply To: HDMI only works on some Televisions.
You may want to try forcing a particular resolution by using HDMI_GROUP and HDMI_MODE. It’s kind of a shot in the dark, though.
https://www.raspberrypi.org/documentation/configuration/config-txt.md