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 Post subject: Re: PC Engine RGB jailbars, let us find a working solution
PostPosted: Sat Jun 17, 2017 7:29 am 


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Joined: 26 Jan 2005
Posts: 424
Location: Singapore
Not sure this thread actually mentions what seems to be now one the best accepted solution : replacing a couple of 100 nF surface mount caps by 4.7 uF ones.

The explanation by viletim on this page, as well as how to fix it on some PCE models :
http://etim.net.au/av-driver/pcebars/

Some useful cap maps for more models on the Console5 wiki :
https://console5.com/wiki/Hu6260#Jailba ... al_Bar_Fix

I'm going to try the fix on my SuperGrafx.
I can see the banding best in Battle Ace, both on my small Trinitron and via the OSSC, just at the start of the first level, when there's a white flash, that then turns into a blue sky.


By the way, the link given by Artemio below is now dead, can someone re-upload it somewhere ?
Artemio wrote:
I did make a small rom before making the suite that has the patterns that show banding in my setup: https://dl.dropboxusercontent.com/u/1403041/banding.pce
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 Post subject: Re: PC Engine RGB jailbars, let us find a working solution
PostPosted: Sat Jun 17, 2017 8:39 am 


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Joined: 26 Jan 2005
Posts: 424
Location: Singapore
Yep, SuperGrafx now jailbar-fixed after replacing caps C168 & C169.
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 Post subject: Re: PC Engine RGB jailbars, let us find a working solution
PostPosted: Sat Jun 17, 2017 9:52 am 


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Joined: 26 Jan 2005
Posts: 1896
Location: Norway
parodius wrote:
By the way, the link given by Artemio below is now dead, can someone re-upload it somewhere ?


Enjoy!

http://gameordie.com/shmups/banding.pce
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 Post subject: Re: PC Engine RGB jailbars, let us find a working solution
PostPosted: Tue Aug 29, 2017 12:14 am 


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Joined: 27 Jul 2012
Posts: 79
Hey there guys, I wanted to see if any of you could help me.

I recently installed Tim´s AV Driver in my IFU30 Interface unit and on my Sony Trinitron CRT TV it looks great, but when I pass it through my framemeister these horrible jailbars appear. Nevertheless, Tim´s AV Driver came with the necessary 4.7 uF ceramic capacitors, so I have replaced capacitors C135 and C133 with the 4.7 uF replacement inside the PC Engine console, but the jailbars when used with the Framemeister are still there.

Then I changed the +5V power from the C 21 expansion slot on the IFU30 to the AV Driver to from the 7805 linear voltage regulator to the AV Driver and guess what? It made the jailbars worse!

I had a similar experience with my N64RGB (Tim´s RGB mod for the N64). It had the same exact issue, on the CRT the games looked great, but if I try the same video signal with the framemeister mini, jailbars would appear. It took some time before they figured out it was a grounding issue.
viewtopic.php?p=1241937#p1241937

Maybe the same thing happens with my PC engine mod?

Any comments would be appreciated. Thanks!

Image

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 Post subject: Re: PC Engine RGB jailbars, let us find a working solution
PostPosted: Tue Aug 29, 2017 12:49 am 



Joined: 13 Mar 2011
Posts: 1018
Location: Toronto, Canada
Truth is I've had mixed results with the AV driver. At this point I would only install it in a TG16 (because it has the audio amp) but overall it's very sensitive to picking up and amplifying noise in the system.

A THS7374 or THS7314 based amp (like what you'd put into a turbo duo) would look much nicer but will have low volume.

Pick your poison with tg16.


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