Vladio Posted October 25, 2013 Share Posted October 25, 2013 I bought a used 19" LCD that I hope to use with my C64 to save counter space. It seems like there a refresh sync problem. Anyone run into this and what did u do to work around? Quote Link to comment https://forums.atariage.com/topic/217956-lcd-tv-problem-with-c64/ Share on other sites More sharing options...
RickR Posted October 25, 2013 Share Posted October 25, 2013 A couple of questions:- Does the TV work properly with other sources? Like a VCR or a different video game system? - How are you connecting the 64 -- via RF cable or composite? Quote Link to comment https://forums.atariage.com/topic/217956-lcd-tv-problem-with-c64/#findComment-2853282 Share on other sites More sharing options...
carlsson Posted October 25, 2013 Share Posted October 25, 2013 I think the C64 just like e.g. NES and others output a progressive signal, which means 25 full frames instead of an interlaced signal with 50 half frames (adjust to 30/60 if applicable). In that case, your LCD TV might get confused and display the picture as illustrated. Another catch is that the TV is set to the same video mode as your C64 outputs, that would be PAL or NTSC. You haven't specified your location, but I would guess both are set to the same region. Possibly the TV can be adjusted to different input video modes though, so in case it gets confused from the above it might be possible to change settings. Quote Link to comment https://forums.atariage.com/topic/217956-lcd-tv-problem-with-c64/#findComment-2853325 Share on other sites More sharing options...
Keatah Posted October 25, 2013 Share Posted October 25, 2013 See if you have any phase/timing adjusts in the menus. It's an obscure option that some sets have, only 6 out of 17 of my displays have it. Quote Link to comment https://forums.atariage.com/topic/217956-lcd-tv-problem-with-c64/#findComment-2853340 Share on other sites More sharing options...
JamesD Posted October 25, 2013 Share Posted October 25, 2013 I had a 15" TV/Monitor that would work with DVD or VCR but it wouldn't work with most of 8 bit computers or videogames I tried. A lot of early LCD TVs were like this due to the early chipsets making some assumptions about the video signal.The computers generate the same image every frame rather than interlaced.If I remember right there is something different in the NTSC sync between the interlaced frames so the TV puts them in the right place. When the LCD tries to deinterlace the image it assumes alternating syncs and gets confused when the input repeats the same sync signal. I think the LCD waits the maximum possible delay for the alternate sync and then starts displaying the incoming image wherever it's at and it waits for the next sync which offsets the image like that. It was something like that anyway.Bottom line, it's the chipset in the LCD TV and I don't think you can't fix it. Quote Link to comment https://forums.atariage.com/topic/217956-lcd-tv-problem-with-c64/#findComment-2853378 Share on other sites More sharing options...
Vladio Posted October 25, 2013 Author Share Posted October 25, 2013 My TI99/4a works fine with it. I'm using a rca to F type connector. To me, it looks like frequency issue. The tv does have a ton of inputs, I just remembered that Directv left me a Coax to RCA adapter. I'm going to give that a try this evening. BTW and sorry about it not being in my profile but I'm in Lancaster, Pa USA... NTSC Quote Link to comment https://forums.atariage.com/topic/217956-lcd-tv-problem-with-c64/#findComment-2853512 Share on other sites More sharing options...
JamesD Posted October 25, 2013 Share Posted October 25, 2013 My TI99/4a works fine with it. I'm using a rca to F type connector. To me, it looks like frequency issue. The tv does have a ton of inputs, I just remembered that Directv left me a Coax to RCA adapter. I'm going to give that a try this evening. BTW and sorry about it not being in my profile but I'm in Lancaster, Pa USA... NTSC One of my machines worked on that monitor of mine. I didn't test a TI or Coleco. Quote Link to comment https://forums.atariage.com/topic/217956-lcd-tv-problem-with-c64/#findComment-2853538 Share on other sites More sharing options...
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