Snes Component Mod

Discussion in 'Modding and Hacking - Consoles and Electronics' started by Pikmin, Feb 9, 2019.

  1. Pikmin

    Pikmin Resolute Member

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    So I should get the schematics and trace where each pin of the S-ENC is going?
     
  2. Pikkon

    Pikkon "Moving in Stereo"

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    Don't think there's a schematic for any pal snes's available,only for the first JPN/US systems that I'm aware of.

    Just trace out the s-enc to the via's with your meter.
     
  3. Pikmin

    Pikmin Resolute Member

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    Last edited: Feb 15, 2019
  4. Pikkon

    Pikkon "Moving in Stereo"

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    Guess you didn't find any broken traces on the s-enc and as for the snes it has internal traces as well.

    You could replace the caps near the muliout,that can affect video.
     
  5. Pikmin

    Pikmin Resolute Member

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    Are you talking about the ones on the bottom side, the really small components?
     
  6. Pikkon

    Pikkon "Moving in Stereo"

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  7. Pikmin

    Pikmin Resolute Member

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    I’m gonna think about this, don’t have the required parts. Thanks for the suggestion
     
  8. Pikkon

    Pikkon "Moving in Stereo"

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    I can say if you get the component mod working it should be all in color just like rgb.
     
  9. Pikmin

    Pikmin Resolute Member

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    I’ve retried the component mod, soldered Y to MAV pin 7 no video again
    Tried with a 75 ohm resistor on Y still nothing.

    Tried with 470 uF caps on Pr Pb, same

    Tried Y on Pin 23 of the S-ENC with the 75 ohm resistor, get picture but predominantly green, inaccurate.

    neojapan had the same issue, he tried pin 7 first and had no video output.

    I failed to mention an important fact, i didn't connect the ground to the RCA. The plan was to do it once I confirm everything us working. Could I have killed a component because of not using gnd?
     
  10. Pikkon

    Pikkon "Moving in Stereo"

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    If you never connected ground then that's why the mod never worked in the first place.

    If you want I can take some voltage readings and get back to you.
     
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  11. Pikmin

    Pikmin Resolute Member

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    I would be grateful, thank you

    I'm such an idiot. Soon as I added ground in the mix I was able to see video with Luma on pin7, but the colours are like on composite and not right.

    I have measured voltage on the S-ENC

    Pin 1 - 3.29
    Pin 24 - 3.68

    Pin 23 - 0.82 (nothing connected to it now but thought I check, because that's the pin I messed around with when I started)

    I take it I would need to take measurements on the Multi AV Out?

    If only I didn't rush, but lesson learnt

    Edit: Tried RF same issue with colour

    If RGB is working fine then it's gotta be something with Composite or Y and C

    Pin Description
    === ===========
    1 Red analog video out (1v DC offset, 1vpp video into 75 ohms)
    2 Green analog video out (1v DC offset, 1vpp video into 75 ohms)
    3 Composite H/V sync out (1vpp into 75 ohms)
    4 Blue analog video out (1v DC offset, 1vpp video into 75 ohms)
    5 Ground
    6 Ground
    7 Y (luminance) signal for S-VHS (1vpp into 75 ohms)
    8 C (chroma) signal for S-VHS (1vpp into 75 ohms)
    9 Composite video signal (1vpp into 75 ohms)
    10 Vcc / +5v (Could be a high logic signal or power for an external RF modulator)
    11 Left channel audio out
    12 Right channel audio out
     
    Last edited: Feb 16, 2019
  12. Pikmin

    Pikmin Resolute Member

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    I’ve been looking at the schematics of a pal console and although its for the same model its not identical, a few components are missing from my board.
    I wonder what the best way is to test some of the components on the bottom of the board, like the Q10 transistor, I take it i need to desolder it to test properly
     
  13. Pikkon

    Pikkon "Moving in Stereo"

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    Sorry for not getting back to you sooner.

    I was messing with a super fami I modded years ago,had the same color problem as you,I removed the s-enc to do some clean up and soldered it back on,was still doing it so I pressed on the chip right by pin 1 and all of the colors came back,resoldered and everything is back to normal.
     
  14. Pikmin

    Pikmin Resolute Member

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    Thanks for your reply. No worries, I’m grateful
    I've tried removing the solder with a braid and touched up all the pins yet again but still the same.

    I wonder if I should remove the S-ENC from the mainboard like you have done?

    This is roughly what I managed to trace, still a few that are NC or can't find.
    Also one mistake, 8 in the photo should be 7
     

    Attached Files:

    Last edited: Mar 5, 2019
  15. Pikmin

    Pikmin Resolute Member

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    Making things worse every day.
    Well I ended up lifting the pin 1 and the pad with it, so I soldered a patch wire, no change. There was continuity before I lifted the pad.

    I also tested a game without pin 1 connected and the picture is black and white. Same happens if i lift pin 24.
    I guess that makes sense without either R or B output colours cant be calculated properly (?)

    When i try without pin 23 connected I get no output at all.

    Thats all I have time for today
     
  16. Pikmin

    Pikmin Resolute Member

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    I've desoldered the S-ENC last week, there were a few missing via's going under the chip which I could now check but found nothing out of the ordinary. Lifted yet another pad...

    A parcel arrived today with a SFC in it (SNS-CPU-GPM-02). Spent a few minutes considering if I should risk desoldering the video encoder and try it on the PAL Snes. Almost lifted another pad...

    And success, which leads me to believe I've somehow killed the original video encoder when I was soldering to pin 23 and the console was not discharged.

    Now if only I could source another S-ENC from a faulty console somewhere...

    Hope this helps someone, it's been a long journey, thanks Pikkon

    All that's left now is to actually re-do the mod and play some games, will leave that for another day
     
  17. Pikkon

    Pikkon "Moving in Stereo"

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    That's awesome,glad you got it working,smart move on swapping the chip.

    I should have some spare S-ENC chips but I'm in the US but I'm sure you could find a broken snes/sfc for cheap.
     
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  18. Pikmin

    Pikmin Resolute Member

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    Thanks for your help, can I ask you one more thing Pikkon- how do I go about removing the RF module? I've never done that before.
    Yeah I should be able to source a faulty one at a decent price.
     
  19. Pikkon

    Pikkon "Moving in Stereo"

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    For the RF module you should use a desoldering gun or maybe a solder sucker.

    But I didn't have the tools at the time so I took a pair of pliers and rocked the module back and forth,it came off fine but the module itself was ruined.
     
  20. Pikmin

    Pikmin Resolute Member

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    Thanks, I wasn't sure if I had to remove the whole plastic module including the DC-in plug before I can get to it first
     

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