I got an Amiga CD32 without colour on the S-Video output on my work bench.
Schematic of S-Video ouput.
I tested input signal (Base) of the Q282 2N3904 (NPN) transistor, result is ok (see picture above).
Ouput signal:
That’s not what it should be, so replaced transistor Q282, result after replacement is still the same. I removed C282 to isolate Signal between Q282 and output connector (CN9). Signal is still like the picture above, so transistor Q282 and C282 are not the problem.
Let’s see if I remove R284. Signal still the same, but… Resistance of R284 is 0 – 0,1Ohm, hmm that should be 100Ohm, let’s replace it and test again.
Signal on pin 1 of C282 is like above, so that’s good. I placed a new C282 and signal is still good, also after C282 without bias voltage.