[virsago]

Try setting Analog sync LPF=30MHz and H-PLL Pre-Coast=0

Reducing the first setting seemed to reduce a bit of “jitter” I was noticing but both together didn’t eliminate the problem, unfortunately.

[virsago]

@virsago That’s awesome news! Can you clarify if this was with the IT content flag set to on, or it works anyway?

Nope. I was excited to see it in the update notes and couldn’t wait to try it out, but it didn’t matter. Normally I have my OSSC set to do 240p passthrough on boot, but the FW update must have reset my default profile because it was set to a now-functional line 2x. From there I tested the other settings and saw they all worked. Finally, my OSSC can do more than just 240p HDMI!

I did get around to testing my SNES and noticed it worked in each setting, but had some issues with sync. I’m not entirely familiar with all the terminology but I noticed an intermittent “screen tear” that might be fixable through tweaking settings. I’ll have to play around with it more. If anyone has any pointers, please throw them my way.

[virsago]

So I don’t know why, but everything works on my TV now. Thank you so much @marqs!

[virsago]

As of 0.77, I can now use every line multiplier on my Samsung UNKU6300 with my Sega Genesis. Still need to test SNES.

[virsago]

@marqs That’s disappointing. I’ll give it a shot on my own display once the newest build is released and see if it makes a difference for me. Thanks for adding it though. Crossing my fingers.

[virsago]

If it’s something you want to test out before going ahead and fully implementing it into an official FW update, I’d be glad to help.

[virsago]

As the owner of one of “those TVs” (the Samsung 4K to be specific), I would love this. All of my other consoles can use my TV’s PC Mode, but for some reason the OSSC just can’t access it. I’m not sure if it would even help, but it’s the only thing I can think of that would allow my TV to accept something other than 240p passthrough. Nothing else seems to work.

[virsago]

@donet I would guess not since it’s pretty similar to @destinydoom and mine’s TV, the KU6300. I know that particular model has true HDR as opposed to the KU6300, but I don’t know if that would make a difference with handling the out of spec video put out by the scaler. It can handle 240p/480p over HDMI using the OSSC’s passthrough mode but that’s really it. Barring some obscure timing tweak in the scaler or a miracle FW update to either the TV or OSSC, I’m not sure if it will ever work.

I forgot to mention that destiny got his to work by running the OSSC through his receiver and out to his TV, but I believe his particular receiver is a few years old and has actual scaling for resolutions lower than 1080p. This might not work with a modern receiver because they usually just scale 1080p to 4K or not at all. Either way I couldn’t get mine to accept 1080p (through Line 5X).

[virsago]

@Harrumph, your tweaks haven’t worked for me but they’re giving me hope, so I want to thank you for what you’re doing. I dunno if you can figure out how to get my Samsung 4K to work with anything but 240p passthrough, but the manual is here if you want to give it a shot.

[virsago]

I think it’s just my TV. The HD Retrovision cables work with the OSSC and 2X/3X (not sure about 4X/5x since I tested before the latest FW) when hooked up to my brother’s computer monitor. Barring some obscure timing tweak I can make with the scaler, a firmware updare from Samsung, or maybe something squirreled away in the TV or receiver’s service menu, I don’t think anything but passthrough will work.

[virsago]

Tried these tips/tweaks on my Samsung UN50KU6300FXZA but unfortunately they didn’t work in any mode, despite the TV clearly supporting these resolutions. I believe the problem might be the inability to use the TV’s PC mode with the OSSC, which is odd because my Xbox One S and PlayStation 4 are capable of using it. Maybe it’s due to the analog-to-digital signal coming from the OSSC. If anyone knows where to go from here (besides getting a new TV), please let me know!

[virsago]

@destinydoom I saw your post and tried it for myself. Unfortunately it didn’t work through my Yamaha RX-V377 or my new Onkyo TX-NR656. As of FW 0.76, I can at least use 240p passthrough, with both the TV and receiver recognizing the signal as 240p. Having game audio play through my receiver speakers is nice. Something strange I noticed was that the receiver and TV recognized the signal as 240p when TX Mode was set to DVI, but the receiver recognized it as 480p and the TV as 240p when set to HDMI (which also required tweaking the horizontal sample rate lower to fix an overly-jittery picture). My receiver perceives changes in the horizontal sample rate as changes in resolution. For example, going from 856 to 850 in 240p passthrough changed the signal from “DVI 240p/59” to “1440 x 240p DVI.” Maybe if I keep fooling around with the sampling options, I’ll find a way to get everything working. Unfortunately it’s all pretty foreign to me, so if anyone has any suggestions, please throw them my way.

To reiterate, this was on my Samsung UN50KU6300FXZA 4K accepting HDMI input from an Onkyo TX-NR656. The OSSC is plugged in using a DVI to HDMI cable from Amazon, and the NTSC Mega Drive’s video output is through HDRetrovision’s component cables.

[virsago]

– SAMSUNG UN40KU6300GXZD (4k)
240p x2: NO
240p x3: NO
480i: NO
480p: YES
480p x2: NO
480i passtr: YES
SNES: NO

TV firmwware version at the moment: 1154

Yes, unfortunattely there is no 240p support for this TV model at the moment. I tried all the 3 HDMI ports of the TV, all available picture modes (game mode, HDR mode and even soccer mode) and “HDMI UHD color function” (exclusive function from HDMI port 1), with no success. When turned on the OSSC, the TV detects resolution in as “SD 720X480 / 60p” and the pattern screen is shown normally , but when I turned on the 240p console (e.g. Sega Genesis), all I got is a black screen following an warning “resolution not supported”. The not supported resolution that TV detects is “720X480 / 60i”. On OSSC, the display shows “AV1: RGBS 262p 15.67kHz 59.84Hz” with green led, if INFO button on remote control is pushed, “Vmod: 240p LO: 524 VSM: 0” is shown. I also tried to change TX MODE between “HDMI and DVI. Nothing changes.

Here is the instructions manual (that includes all supported resolutions info) for reference: ENG_US-JZISDBK-1.1.1.pdf
Maybe in future OSSC firmware updates this information can be considerable.

OSSC fw. v0.73

Consoles:

– NTSC Sega Genesis using SCART “raw boosted sync” cable from retro_console_accessories. I get 480i with Sonic 2 (2 players screen) adjusting H-PLL Pre-Coast=3 and H-PLL Post-Coast=3.

– NTSC SNES Mini modded with RGB Amp from retrofixes, using SCART csync cable from retrogamingcables. To get it working flawlessly on my Panasonic TV, I adjust Analog sync LPF=30MHz and H-PLL Pre-Coast=0.

I have this same TV and tried with these two consoles (although with HDRetrovision’s component cables instead of SCART) and had the same problem. It’s weird because I know the TV is 240p compatible because I was previously able to play both these systems directly connected to the TV, and the TV even recognized their signals as 240p and displayed them flawlessly. I’m on the same firmware as well. Hoping future firmware updates can fix this.

[Author]

Posts