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VIC 20 repair
VIC 20 repair
- Frits Jalvingh
Owned by Frits Jalvingh
Missing color on screen
Looking at the video signal (yellow), the luma output of the 6561 (pin2) and the chroma output (pin 3) we see:
The chroma signal is there but is completely missing from the output.
It turned out the previous owner had made a modification that went bad, disconnecting the capacitor that connected chroma to the luma signal. Adding the capacitor fixed it:
Capturing a line in the middle of the screen easily shows the blue border on the left and right sides: