I just got an OSSC to hook up to my new 4K monitor and… I’m having trouble.
I get the grey test pattern, but as soon as switch to my MVS (AV1: RGBS) I see nothing. I’ve tried it on two monitors and a TV (4K Samsung, Ultrawide AOC and 1080p Samsung TV). I changed my sync settings (“Sync OPT. -> H-PLL Post-Coast – 2 lines” and “Sync OPT. -> Hsync Tolerance – 8.30us”) to get sync and see 59.4Hz. I checked the 4K Samsung spec sheet and it supports 56 – 61Hz, so notionally it’s not that problem.
But it appears that the sync rate is jumping on the OSSC screen. And some of the displays seem to detect a signal then lose it.
Any ideas? Some things I think it could be:
– Sync not locking.
– Color space?
– Monitor incompatibility (all three…)
I absolutely did not – my mistake. I also have my PVM in parallel.
For the next revision of my board I plan to add a THS7274 or THS7376 which I believe will give matched impedance. Right now I’m running straight from the JAMMA edge, but attenuated through 500ohm pots (RGB and sync).