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Missing Pixels on screen??
Posted: Wed Aug 16, 2023 1:51 pm
by Rich
Hi Everyone,
Made the plung and got a Vic20 from ebay....... I had to get a new modern power brick(as the one that came with it was giving 18v and 21v on the pins) and got a new Video lead from Retro computer shack, but the picture is awful pixels missing from the letters also ajusted the pot to get the brightness better, I`m going to recap the mother board but i`m still waiting for the parts to come... I hope its not the vic chip, any ideas
Cheers Rich
Re: Missing Pixels on screen??
Posted: Thu Aug 17, 2023 12:00 am
by srowe
Are the missing pixels consistent? As in, if one is missing in the top row of an "A" do all "A"s look the same? Can you attach a screenshot?
Re: Missing Pixels on screen??
Posted: Thu Aug 17, 2023 12:41 pm
by Rich
Re: Missing Pixels on screen??
Posted: Thu Aug 17, 2023 1:02 pm
by srowe
OK, I'm not a video expert but that looks like artefacts from upscaling?
Re: Missing Pixels on screen??
Posted: Thu Aug 17, 2023 1:41 pm
by Rich
srowe wrote: ↑Thu Aug 17, 2023 1:02 pm
OK, I'm not a video expert but that looks like artefacts from upscaling?
Im using a scart to hdmi as ive got no tv with a scart input like this one, I use it for my amiga and zx spectrums with no problems.
Just borrowed a tv with scart and its worst thant the scart to hdmi, I think i might just wait till ive recapped it 6 caaps in total. I`ll post my results at a later date
Re: Missing Pixels on screen??
Posted: Thu Aug 17, 2023 2:34 pm
by bjonte
All the pixels seems to be there. It’s just really blurry. The image quality isn’t great on an unmodded machine and a HDMI converter on top of that only can get worse.
Re: Missing Pixels on screen??
Posted: Thu Aug 17, 2023 4:00 pm
by Rich
bjonte wrote: ↑Thu Aug 17, 2023 2:34 pm
All the pixels seems to be there. It’s just really blurry. The image quality isn’t great on an unmodded machine and a HDMI converter on top of that only can get worse.
Is this the best MOD
https://www.youtube.com/watch?v=4tbvpRiM36E
Re: Missing Pixels on screen??
Posted: Fri Aug 18, 2023 1:58 am
by Mike
Rich wrote:Is this the best MOD[?]
Any variant of the S-Video mods - as firstly presented
here in Denial in 2008 - which provide separate Luma and Chroma (a.k.a. S-Video) will do. You will have to make sure though, that your converter box actually has S-Video input.
Between Video Out socket and either CRT monitor or HDMI converter, I use this cable plugged together from a DIN to 4xRCA breakout adapter, an AV cable, and one 2xRCA to S-Video adapter:
Yellow is Luma, Red is Chroma and White carries the audio signal.
Re: Missing Pixels on screen??
Posted: Fri Aug 18, 2023 1:55 pm
by Rich
Thank you everyone for the replys, gets abit frustating this old 8bit retro stuff but worth it in the end
I will do the recap then the MOD and try to report back in a few weeks when I have time to do it I`ll get some more photos ready....