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You would get a raster even with the video wire disconnected. The signal on that wire modulates the brightness.
I'm wondering if socket was wired right for the 21FAP4. I see that you swapped pins 2 and 3 however.
The 21FDP4 has G1 on pin 3 and G2 on pin 6.
21FAP4 has G1 on pin 2 and G2 on pin 3
So you maybe needed to swap pins 3 and 6 rather than 2 and 3 ?
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