Posted By
siz
on 2020-06-27
02:13:17
|  Re: Quality of S-Video image from a Plus/4 - mine looks bad
According to TLC:
There's also a small design flaw in all 264 series machines: there is a ferrite bead in series with the common ground point of the video out port, which (i.e. the common point that has non-negligible resistance above the 1-2MHz mark) causes crosstalk between the signals. (This is the main reason why the separate luma-chroma output image of these machines looks bad... there is so much crosstalk between luma and chroma that it introduces visible moire on the image). All in all... if you want to get rid of a disturbance factor, find and short the FB between the machine's and the socket's ground.
The fix:
Just short the FB with a piece of wire on the underside of the PCB.
Easily reversible that way.
On the C16 and C116 it's FB13 and on the Plus/4 it's FB7.
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