60Hz mod on SNES, top of the picture is fuzzy.

I touched on this in my previous thread when I was asking about which TV to get.
http://assemblergames.com/l/threads/lcd-led-tv-for-retro-gaming.60387/

I modded my SNES some time ago, doing the 60Hz and region switches, following the guides on mmmonkey.
But as you can see from this picture, the top of picture of "fuzzy", the further down the screen you go, the better it looks.


It does this on the TV I use for gaming, but seems to work fine on the living room TV.
I'm using a PAL RGB cable from retrogamingcables.co.uk.
At the moment, when I want to play at 60Hz, I'm using a HDMI upscaler.

I was told in my other thread that I need to mod the console properly, but I have no idea how to do this. Can anyone help?

 

It looks to me like interference from getting sync from luma rather than using csync. Do you have a sync stripper? If not, it might be worth investing in one as it may help, as sadly there is no way of getting csync from a PAL SNES.

 

You can get csync from a PAL snes...

Unless you mean without mods? But if he's got mods done already, what's the problem of doing more mods?

Anyway, I've seen this before and I'm pretty sure it's the timing difference on 60hz from modding a PAL console (frequency is slightly wrong) vs an actual ntsc console. This happens on the mega drive too, but someone's made a variable crystal circuit (as they are hard to find in correct value for the mega drive).

 

You can't, the PAL SNES outputs 12V on the csync pin, the best you can do is sync on luma with a stripper.

 

I said I assume you must of meant without a mod, as you can easily get csync with a mod. If he's already modded the console for 60hz, then getting the csync mod isn't a big deal. It's either on one of the amp pins or you can get it from ppu2 (pin is around 100 off top of my head)

But anyway, I've seen this before - even when using csync.

If you want proof this is a known issue, read sync part of this page about the xrgb - http://junkerhq.net/xrgb/index.php/XRGB-mini_FRAMEMEISTER#Sync_Mode

 

I agree with Bad_Ad84... Getting /CSYNC out of a PAL SNES is not a big deal. I do have a 1Chip-PAL-SNES which outputs /CSYNC at pin 3 and pin 7 of the MultiAV (I neither need 12V (I do have a stup-up converter 5V to 12V in my Scart-cable) nor S-Video; both are disconnected). I also know that keropi has successfully modded his 3Chip-PAL-SNES to output /CSYNC at pin 3 of the MultiAV.
The modding work is just a piece of cake

 

Can't say I've understood a single reply.
Is the problem fixable, or should I just be content with 50Hz?

 

The long and short of it is, get a proper NTSC SNES if you want to eliminate the problem. The timings on a PAL SNES in 60Hz mode will always be off due to the oscillator used to produce a PAL signal.

 

Unless you install dual oscillators.

 

Sounds like a quote from Back to the Future.

Can a NTSC SNES be modded to play PAL games? Because 95% of my collection is PAL.

 

PAL and NTSC consoles use different oscillators to get their timings.

If you mod a PAL snes for 60hz, it will be slightly out of spec in 60hz and fine in 50hz.
If you mod a NTSC console for 50hz, it will be slightly out of spec in 50hz and fine in 60hz.

The easiest way to get what you want, is a SuperCIC modded 1chip console (NTSC or PAL). As a dual oscillator mod/circuit already exists for that console.

 

Thanks for explaining that.
Any tips on how to get my hands on a 1chip console?

 

Probably try and buy one here. If you try ebay, will have to ask people for pictures of the bottom of the console. IIRC, you can tell by what you can see in the vents.