Vertical lines on Plus

[davdav79]

Hi! I have these machines:

CPC6128, no problems... great picture
6128PLUS on RGB on a TV it gives me heavy vertical lines issues, very annoying
464PLUS on RGB on a tv gives me also vertical lines, but not too much as the 6128plus

I'm using a RGB scart cable from retrocomputer shack and a jamma power supply for the 5V line

Any idea? thanks

[Bryce]

Hi,
     yes, it's due to Alan sugar scraping the last penny of profit out of the machine and removing the capacitors from the RGB outputs. Not noticable on a CRT, but it shows up on modern TVs. More info here: Dirty video on 6128 Plus RGB Scart

Bryce.

[Kris]

Each Plus owner should apply this fix; it's a shame to have a video signal output without "filtering"

[||C|-|E||]

Mine actually suffers from this... I should fix it, but I am considering to use a proper CRT instead 

[davdav79]

Hi,
     yes, it's due to Alan sugar scraping the last penny of profit out of the machine and removing the capacitors from the RGB outputs. Not noticable on a CRT, but it shows up on modern TVs. More info here: Dirty video on 6128 Plus RGB Scart

Bryce.

So, should I add a 'star' of three 220 pF capacitors from ground to each RGB line?

[Bryce]

Yes.

Bryce.

[davdav79]

I'll Try. thanks

(But why on the 6128+ the issue is bigger than the issue on the 464+ ? maybe different board revisions?)

[Bryce]

No idea. The PCBs are identical so it can only be down to the tolerances of the parts used.

Bryce.

[seanb]

I've been meaning to ask this question myself.
Glad there's an answer even though I did see Bryces earlier answer on the dirty picture thread a long time ago.

That's one hardware problem hopefully sorted.
Thanks everyone.