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I forgot to mention that I am drawing the schematic of the video section with KiCAD (http://kicad.sourceforge.net/wiki/index.php/Main_Page). I will post it when it be finished. I am using the schematics on the web and the pcb to complete the information. Unfortunately I am unable to read the capacit...

Have you tried using composite video connector round the back? This should tell you whether the fault is in the TV modulator or in the video circuitry. Yes I am using both of them and I get the same result. I built a SCART lead connecting the video signal from the DIN connector (pin 3) to pin 20 (c...

Blue as in the text screen that appears is blue? That would be wrong (should be green) - perhaps one of the two chroma lines or the chroma bias line (between the 6847 and the LM1889) is broken too? Mmm you may be right. Actually the broken track connected a resistor (R60, 15K) and one of the chrome...

I got a burnt Dragon 64 computer from a work mate some years ago. I never tried one of these before. When I switched it on for the first time the TV signal was missing and I didn't know what was wrong. Recently I decided to try to fix it. I started checking the PSU and found that the DC voltage leve...