Posted By
BSZ
on 2021-07-20
16:33:33
|  Re: Commodore 16: Black and white screen on Composite, color on the RF
@TLC: I lost the thread a long time ago. 
@Retroshire: Sorry, but I'm just guessing. It's not a common problem. I would also check the power supply of the modulator, as TLC wrote. However... The oscillator's trimmer does not change the picture... Maybe the problem is the quartz itself? 35+ years old electro-mechanical component... Maybe it is no longer accurate enough and cannot be tuned enough? For some reason the TV tolerates the deviation better on RF than on CVBS / S-Video. Maybe replacing the quartz might be worth a try, just in case. Assuming you haven't already done so. 
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