Genesis Model 1 – No Sync

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  • #26905
    bamf226
    Participant

    I’m having a bit of a problem getting my Genesis to work with the OSSC. I am using Retrovision component cables and connecting directly to the OSSC. When I turn on the Genesis, it doesn’t recognize the signal. I can get audio/video through the RF adapter hooking straight to the TV. I also tried hooking the component cables straight to the TV as well (Samsung MU6290). When I hook the component cables to the TV, the image flickers. I seem to get a frame of video once every couple of seconds. Mostly the screen is black, but I do get a flicker of green before the flicker of video. Is this a problem with the composite output or is this a known problem that the OSSC can handle if I change some settings?

    #26907
    fatherted
    Participant

    What kind of Model 1? NTSC?

    Any mod work done on this unit? Any luck with the Composite out/Yellow RCA?

    Only other thing I can recommend if the OSSC is working with other consoles, is to reset all the settings and save that to a profile and go from there.

    #26908
    nmalinoski
    Participant

    Is this a problem with the composite output or is this a known problem that the OSSC can handle if I change some settings?

    Where are you expecting composite output? The Genesis 1 (and 2) outputs RGB, which gets converted to YPbPr by the HD Retrovision cables.

    When you have the Genesis and HD Retrovision cables connected to the OSSC with its input set to AV2-YPbPr, what happens with the LED (does it stay red, green, flicker?), and what does its LCD say?

    #26909
    bamf226
    Participant

    What kind of Model 1? NTSC?

    Any mod work done on this unit? Any luck with the Composite out/Yellow RCA?

    It is NTSC and not modded. I do not have any settings. The only thing I have done with my other consiles is change the line multiplier. Works with PS2, XBox, and SNES.

    #26910
    bamf226
    Participant

    Where are you expecting composite output? The Genesis 1 (and 2) outputs RGB, which gets converted to YPbPr by the HD Retrovision cables.

    When you have the Genesis and HD Retrovision cables connected to the OSSC with its input set to AV2-YPbPr, what happens with the LED (does it stay red, green, flicker?), and what does its LCD say?

    I wasn’t expecting composite. Just thought that was the output.

    The OSSC says No Sync and the light is red. I assume this is due to the signal coming out of the Genesis being so poor.

    #26916
    BuckoA51
    Keymaster

    Check that the component cables are the right way around.

    #26917
    bamf226
    Participant

    I have red to red, blue to blue and green to green. No sync with OSSC, flickering picture direct to TV

    #26919
    bamf226
    Participant

    Also tried plugging into different colors just to see if perhaps the colors were mislabeled on the cable. The only video response I get is when plugged into the proper colors.

    #26923
    bamf226
    Participant

    Can anyone else help? I’ve tried everything I can think of.

    #26925
    fatherted
    Participant

    Does the Sega work with the retrovision cables right into the TV with component? (if your tv has component)

    #26927
    bamf226
    Participant

    My TV has dual composite and component. It comes with an adapter for composite where the yellow and audio plug into an adapted that then plugs into the green port on the TV. It has another adapter for red and blue to plug into another port while plugging green into the green port. Are you suggesting just plugging in the green and pretending it is composite?

    #26928
    Harrumph
    Participant

    It seems to me the problem is either the console or the cable. HD retrovision cables are generally trouble free afaik. Maybe you can borrow a genesis from someone to test?

    #26930
    marqs
    Participant

    If you have original composite cables for Genesis, try plugging composite (yellow) to OSSC AV2 Y (green) input. Then select AV2 YPbPr mode and check if OSSC syncs – that should give indication if the problem is with Retrovision cable or not.

    #26942
    bamf226
    Participant

    I’ve bought another Genesis on ebay to test. I don’t have any composite cables to test. The unit only came with the RF connector. I did try to plug in to just the component slot with the green cable and got black and white video. Tested composite with green/red and green/blue and got original results of black screen with flashes of green but no glimpses of actual video from the console. I’ve also tried different games just to eliminate that as a problem. Not sure if this helps troubleshoot.

    #26947
    nmalinoski
    Participant

    I did try to plug in to just the component slot with the green cable and got black and white video. Tested composite with green/red and green/blue and got original results of black screen with flashes of green but no glimpses of actual video from the console. I’ve also tried different games just to eliminate that as a problem. Not sure if this helps troubleshoot.

    RF is essentially composite video and a mono (rarely stereo) audio stream muxed together, and composite video is basically luma (Y) muxed with color data (C, Pb+Pr); so, when you connect composite video to a device expecting luma (Y), you should get a black-and-white image. The OSSC can decode luma on its Y/G input, but it cannot decode chroma or audio, thus the black-and-white image.

    YPbPr component operates by putting, effectively, a black-and-white image on one cable (luma, Y, the green one), the difference between luma and blue on the second cable, and the difference between luma and red on the third cable, leaving green to be calculated. Knowing that, it makes sense that connecting RF (or anything, really) to the either the blue (Pb) or red (Pr) inputs would get you practically nothing.

    Ultimately, it shows that the Genesis is working and properly generating images; so now, either there’s something wrong with the HDRV cable and/or Genesis 1 adapter, or there’s something wrong with the composite video output on the AV jack.

    Have you checked both the HDRV cable and the Genesis 1 adapter to make sure there are no bent or missing pins? You may want to track down a composite video cable simply for testing, because that will immediately show you whether or not the console is properly outputting composite video from its AV jack.

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