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NTSC VIC-20 to PAL Conversion: Anybody know the electrical equivalent to my index finger???


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I know this is an odd title. But I swear I'm for real. I'm in the process of converting my NTSC VIC-20 to PAL. I managed to install/swap all the components using this site as a guide: http://blog.tynemouthsoftware.co.uk/2016/08/vic20-pal-to-ntsc-conversion.html

 

Having followed these instructions, my VIC-20 produces a stable picture, but depending on the screen the color is either unstable or monochrome. That is unless I bridge the leads between R9 and FB7 with one of my fingers. Then the picture is perfect on all my PAL compatible screens. So it would appear that I LITERALLY need the electrical equivalent of my finger tip to get this to work. However, it's kinda hard to use a computer if my hand has to be constantly stuck inside it. Any ideas?

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Fixed! Turns out I had soldered the axial capacitor that runs from FB7 to R10 to the wrong spot, linking it R10  to what turned out to be R9 instead. I moved it over, and with some adjustment to R10 the picture is both stable and colorful now!

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