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NEC PC Engine/TurboGrafx-16 Games/Consoles => Console Repair/Mod Center => Topic started by: LaC on 06/02/2013, 03:16 AM

Title: TG16 RGB mod, blurry color bleeding
Post by: LaC on 06/02/2013, 03:16 AM
I recently RGB modded my TG16.
I used the RGB amp here -> http://www.gamesx.com/grafx/pce_rgb.jpg (http://www.gamesx.com/grafx/pce_rgb.jpg)
pce_rgb.jpg

I tried to hook it up to my Sony PVM 2950Q with the amped pure sync as in the diagram.  However, it would not sync properly.  So I switched the sync part of the amp to just use an lm1881n instead and fed it composite and extracted the sync from that. That gave me a fairly nice synced image.
However, there is one annoying problem, there is color bleeding like seen below.
Anyone know what would cause this?

(http://i715.photobucket.com/albums/ww151/LaC64/DSC_0844.jpg)
Title: Re: TG16 RGB mod, blurry color bleeding
Post by: CGQuarterly on 06/02/2013, 11:22 AM
PVMs can use composite video as sync.  Try taking the LM1881 out of the equation and see what happens.  Also, that picture looks like the image is too bright.
Title: Re: TG16 RGB mod, blurry color bleeding
Post by: Duo_R on 06/02/2013, 11:29 AM
what jibba said or perhaps this is a grounding issue?
Title: Re: TG16 RGB mod, blurry color bleeding
Post by: LaC on 06/02/2013, 01:53 PM
The PVM-2950Q doesn't accept composite as sync.  I always have my consoles output raw sync.   When I try the tg16 with composite as sync I just get a black screen.
I do have a PVM-2030, which likes composite as sync. I'll have to give that a try to see if I get the same problems.
The brightness of the screenshot is just the exposure settings on the camera.
Title: Re: TG16 RGB mod, blurry color bleeding
Post by: LaC on 06/02/2013, 04:32 PM
Quote from: LaC on 06/02/2013, 01:53 PMThe PVM-2950Q doesn't accept composite as sync.  I always have my consoles output raw sync.   When I try the tg16 with composite as sync I just get a black screen.
I do have a PVM-2030, which likes composite as sync. I'll have to give that a try to see if I get the same problems.
The brightness of the screenshot is just the exposure settings on the camera.
Yeah, tried my PVM-2030. I don't get any problems there both with regular composite as sync and the output from the lm1881n.