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 Post subject: Re: A fix for SNES jailbars
PostPosted: Sun Jun 30, 2019 7:06 pm 


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Joined: 05 Mar 2018
Posts: 954
paulb_nl wrote:
maxtherabbit wrote:
annd we're good :D
diagonal noise GONE
jailbars in SMW night screens GONE


Which board revision is this? Under which circumstances did you see the diagonal noise?

SHVC-CPU-01

It was visible in just about any solid color


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 Post subject: Re: A fix for SNES jailbars
PostPosted: Thu Aug 22, 2019 4:55 pm 



Joined: 22 Aug 2019
Posts: 1
I just tried this on an RGB-01 and it is most likely C70-75. :)

Image


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 Post subject: Re: A fix for SNES jailbars
PostPosted: Wed Sep 11, 2019 9:04 am 



Joined: 29 Apr 2016
Posts: 188
My 1CHIP-02 has been looking very good with the added 10uF caps. The thick wide jail bars are gone.

I was poring over the PCB scans linked by rama, and it looks like I missed one cap earlier: C69, which appears to decouple WRAM pin 1 (VCC), and also connects to CPU pin 101 (no idea if that's VCC or something else).

So, the (hopefully) complete list for a 1CHIP should be:

Code:
 C5 -- CPU
C57 -- WRAM
C63 -- VRAM
C64 -- VRAM
C69 -- CPU and WRAM


I'll add a 10uF to C69 this weekend. I'm wondering if it may help my last minor issues (very thin jail bars, and moving diagonal noise in the lower right quadrant).


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 Post subject: Re: A fix for SNES jailbars
PostPosted: Tue Oct 01, 2019 1:26 am 



Joined: 19 Mar 2019
Posts: 37
Kez wrote:
Do you have a picture of the issue?

https://www.youtube.com/watch?v=4cECK0Nqtgs


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