If I switch the FPGA Arcade then the TV I see a partial workbench screen (half black and half workbench vertically, the quality is bad) then 2s after the "No signal" message.
Any picture of this ..?
Regarding the Samsung UE40B6000 it seems to lack the PAL modes:
Modes daffichage (VGA et HDMI / DVI)- 640 x 480 @ 60, 72, 75 Hz
- 800 x 600 @ 60, 72, 75 Hz
- 1024 x 768 @ 60, 70, 75 Hz
- 1152 x 864 @ 75 Hz
- 1280 x 720 @ 70 Hz
- 1280 x 1024 @ 60, 70, 75 Hz
- 1280 x 800 @ 60, 74 Hz
- 1280 x 960 @ 60 Hz
- 1360 x 768 @ 60 Hz
- 1440 x 900 @ 60, 75 Hz
- 1680 x 1050 @ 60 Hz
- 1920 x 1080 @ 60 Hz
Perhaps 720x576p @ 50Hz is missing:
https://engineering.purdue.edu/ece477/Webs/S12-Grp10/Datasheets/CEC_HDMI_Specification.pdf"An HDMI Sink that accepts 50Hz video formats shall support the 640x480p @ 59.94/60Hz and 720x576p @ 50Hz video format timings." .. note that the supported formats doesn't include any 50 Hz ones.
Also listed under "6.3.1 Primary Video Format Timings".
Perhaps some code could be written that makes use of this:
"The DDC channel is used by an HDMI Source to determine the capabilities and characteristics of the Sink by reading the E-EDID data structure."
Ie if no 720x576p @ 50Hz format is available, then adapt some other..