Author Topic: PC engine, RGB mod - AMP brightness switching problems (Read 740 times)

cheezio · « **Reply #15 on:** September 02, 2006, 11:06:36 PM »

hi - i would say the lines are horizontal with a slight diagnol slant (angling down from left to right).

The wire is a decent thickness (also used it on a supegun project, and no problems).

the noise effect isnt constant, but varies. (cant tell if it relates to anything else like controler use/audio - doesnt seem to relate).

What sort of grounding issue could it be?

Joe Redifer · « **Reply #16 on:** September 02, 2006, 11:59:46 PM »

Maybe some RF interference. Do you have a microwave oven nearby or anything else which might emit any RF noise?

cheezio · « **Reply #17 on:** September 03, 2006, 12:18:39 AM »

nope - no Microwave nearby.
maybe its electrical - this guys problem sounds kinda similar:

http://nfggames.com/forum/index.php?s=ac86dc3565411ef7378dbcd7ca8f48af&showtopic=1536

they kind of conclude that its internal electrical noise.
the problem I`m seeing is damn subtle, when graphics are shifting about you really dont notice, its just on areas of blank art (mainly menus) or static art you notice the noise.

guess i`ll just have to live with it

FM-77 · « **Reply #18 on:** September 03, 2006, 02:50:03 AM »

I just remembered, I have the same problem with my Mega Drive RGB cable, sort of. It emits noise but it can only be heard when the game's "quiet." I still think it's a grounding issue, but I don't know what to do about it.

Joe Redifer · « **Reply #19 on:** September 03, 2006, 08:27:42 AM »

Most SCART cables suck at audio. The one I rigged up for my TurboGrafx is perfectly quiet, though. I myself have some diagonal lines in the picture. They are very, very, very, very subtle. But once you notice them....