ZX Spectrum no picture

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  • #20393
    MJ4659
    Participant

    Hi, I’m having a bit of trouble with my ZX-spectrum connected via RGB scart to the OSSC and my panasonic TV. In 2x mode I can get sound but no picture.

    Does anyone have any suggestions that might help?

    #20398
    BuckoA51
    Keymaster

    Are you getting “NO SYNC” on the OSSC LCD or just no picture on the TV? What numbers on the LCD are you getting if you are getting some?

    #20402
    MJ4659
    Participant

    Hi,

    The OSSC displays AV1: RGBS 311p 15.55 Mhz 50.00hz.

    I’ve had some luck running the OSSC through my old cheapo upscaler, I can get a picture from that but not from HDMI plugged directly to the tv. It’ll do as a temporary solution but it’s doesn’t handle colours very well (a lot of greys end up looking brown) not to mention the lag.

    I was considering getting a DVDO micro since they’re not massively expensive. Does anyone have any experience with them? Are they any good?

    #20445
    MrTomFTW
    Participant

    Where did you get the SCART cable from, and what model of Spectrum is it?

    I’m working on assumptions here but I have a grey +2 which works fine, but it’s had some work done on it to correct a common hardware fault on that model.

    Now that fault doesn’t cause just a black screen normally, but if it’s repaired and you don’t have one of the SCART cables from Retro Computer Shack or one from Cool Novelties from the last 6 months or so you’ll get… a black screen. If you can solder it’s actually pretty easy to modify any Spectrum SCART cable by opening it up and swapping around pins 16 and 20.

    #20453
    MJ4659
    Participant

    Hi MrTomFTW,

    It’s a +2 grey model as well actually. I use one of those retro computer shack RGB scart cables but I bought it a few years ago.

    I don’t think my speccy has had any work done on it in that regard though (I could be wrong). I inherited in from a friend nearly a decade ago, who I think had had it from when it was new. The only thing I’ve done with it is fix the pause button sticking issue and replaced the drive belts on the datasette.

    Thanks for the response. I might have a go at moddifying the scart cable this weekend. I’m fairly new to soldering but if it’s easy to do I’ll probably be alright.

    #20493
    BuckoA51
    Keymaster

    Have you tried a different TV set too to rule out the possibility the Panasonic just doesn’t like the signal?

    #20662
    acidbottle
    Participant

    My solution is a longshot but may apply to you.

    I had a peripheral, namely divmmc sd card reader plugged into my +3 and using the exact same cable you have. Had a very dark picture, despite being connected directly to the ossc.

    I used some contact cleaner on the spectrum’s interface slot and plugged it all back it. seems some gunk had been causing massive picture interference. So my only suggestion is pull your speccy apart and give it all a good clean, it may work!

    #20663
    MJ4659
    Participant

    Hi,

    Thanks for the replies but I’m fairly sure that it’s as BuckoA51 suggested, the panasonic tv just doesn’t like the signal. It seems to work ok through my samsung monitor and it works fine through an external HDMI scaler as well.

    #20689
    marqs
    Participant

    At least my previous Panasonic TV had very low line count tolerance, accepting only 312/313 lines (not 311p) with 50Hz sources.

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