Posted By
TLC
on 2021-07-20
09:07:25
|  Re: Commodore 16: Black and white screen on Composite, color on the RF
@Retroshire I think the circuit around Q3 (which is a sound buffer amp + mixer + low pass filter) should make no difference w/respect to video, even if it was faulty. C11 / L1 make a low-pass filter for supply voltage (to verify, measure voltage at the "modulator-end" side of L1; 5V +- some tenths is perfect). That IMHO leaves the EMs (3,4,5) between the modulator and the AV socket, FB13 on GND, and possible wire/solder/via shorts and breaks as options.
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