SNES MINI lines on screen (not glich lines)

[the_crayon_king]

So I have been trying to trouble shoot an issue on snes minis

So first let me describe it:

 

Its cascading up and down lines in the video specifically composite or (modded) S-Video.

The lines appear on dark screens but vary on what specific colors they pop up on from console to console.

 

These lines do not appear related to the white middle white bar issue.

 

I've noted that changing the brightness or color of my TV seems to wipe them off of one color only for them to appear on a different set of colors where they weren't present before.

 

I have looked at the waveform and it appears flat (where its supposed to be) on max white and max black.

 

These lines stay in place.

 

I put a variable pot on the composite line to ground and was able to adjust the lines on/off only for them to appear on another color set. There was also warping of color flatness . Areas would appear slightly whiter than others and move with the adjustment of the pot.

 

Appear with/without sound.

 

Appear across stock 7805, new 7805 and 78S05, also appear with brand new wet caps.

Appear the same across different OEM AC adapters.

 

Most notably and possibly relevant is they appear on my CRT others CRT's, S-Video capture devices, but do not appear on the XRGB over composite.

 

I am using 240P test suite on a multicart for testing but I can also see it on real games.

 

I have tried every fix listed for the white bar fix with no change in result.

 

Here is a pic of what I am talking about:

 

 

Two different consoles here the green is all OEM not changed, blue has every white bar fix out there. The blue one has the lines much the same but its harder to see on camera.

 

[the_crayon_king]

Built an amp so I can confirm its not output impedance and tried a few more cables.

 

The issue seems to be AT or BEFORE the PPU

 

The only solution I can thing of possibly is trying a different encoder.

[the_crayon_king]

Ok so now I am using the BH7236AF.

 

I need a spot for "Color Subcarrier"

I can touch the subcarrier pin (6) of the BH and touch random spots on the SNES PCB and get color in my video.

It's relevant to wherever 3.58m is going.

 

I think the pin I would need to attach to is pin 14 or 15 on the SNES PPU I believe PIN 13 is ground but I am going off of memory.

 

Ill figure out which tomorrow I gotta go to sleep. Should have pics of the video from this other encoder which is otherwise working so far.

[the_crayon_king]

Ill just post links to the pics this time:

 

OLD PPU/ENCODER

 

NEW PPU/ENCODER

 

WAVEFORM

 

NEW PPU CIRCUIT

 

Some notes:

The DC offset between the two is appreciable, the new circuit has a lower offset (dunno why) and thus is less bright.

Looking at the waveform the new ppu is yellow the old ppu is blue.

 

Interesting to note the difference in length of the color burst also the slope difference. Notice they both have the same sync timing but when the color burst happens is off by a good bit.

 

I am not sure "where" in the overall 3.58m line I am tapping I haven't traced the line. I was able to find the subcarrier at many spots this spot is a via near the C12 marking on the bottom.

 

I wasn't able to make the lines appear on the new ppu with any adjustment I tried.

 

 

The problem I ran into with troubleshooting was there are more than just the timing lines in the video so I had alot of false positives.

The first green picture at the top of the page is actually showing a different issue altogether (probably fixable with new caps/7805)

Edited February 5, 2018 by the_crayon_king