SNES SuperCIC on SHVC-CPU-01 board

Has anyone encountered difficulty with installing a SuperCIC on the SHVC-CPU-01 revision of the SNES? I'm having enormous difficulty trying to fix a switchless mod installation for someone; I've completely redone the mod twice according to the directions on two different boards (both the same revision), and I'm still having the same problem.

It seems to boot up for a couple of seconds in PAL mode, then both the video and audio completely drop out. Moving around the wires connecting the SuperCIC to the original CIC pads seems to restart the system, but I can't get a stable picture again unless I turn it off and on again. The LED also doesn't light up even though it's wired up correctly to the SuperCIC and has the proper resistors.

Any ideas?

 

Nobody?

 

Have you removed the original CIC all together? If so do you have the resistor in place to ground?
If you still have the CIC chip installed with the lifted pins I would remove it all together and install the mod that way. Also check you 5V source. I use 5V directly from the voltage regulator and find this is the best source.

 

I haven't removed the original CIC chip and I'm not entirely sure that would fix anything. The board I'm working on right now is a replacement; the original board the person sent me had the CIC removed and I still had the same problems. I don't have a resistor connected to ground but I'll give that a go. As for my 5V, I'm grabbing it directly from the 7805 so no problem there.

 

Did you actually fix this issue Fella?

 

I did, it turned out that the SuperCIC needed an extra wire to function on the SHVC-CPU-01 board. I don't remember which one though as it was months ago that I did this.

 

That doesnt sound correct at all - the supercic has no extra inputs or outputs.

Sounds like you possibly picked a bad ground or VCC point - but other than that, it doesnt sound right at all.

Oh also - a decoupling cap is always a good fix for random issues when something SHOULD work but isnt.

Fit a 100nf cap between gnd and vcc as a matter of habit on all these type of things and you will have less hassle/stress.

 

Still have this issue however other things have come up I.E Paperwork- great Ill update this thread more when I get the chance

 

I have had a few people complain about similar symptoms, removing the original CIC and using the 10k resistor fixed it for all of them.

I have never done the install while leaving the original CIC in and never had any problems with any board.

 

Cheers fella that's next on the cards, I hate leaving things unfinished
cheers again Dakar

 

Hi dudes,

In my short experience the Super CIC switchless mod doesn't work in the shcv-cpu-01 since it is not capable to produce 50hz.
The only way to unlock the region is to lift the pin 4 of the CIC and the pins 30 and 24 of the PPU's, no switchs are needed.
An example with a Super Mario All Stars PAL.







Un saludo

 

Are you talking about a super famicom and do you happen to be using a composite lead?

If so, this is known to be an issue on all ntsc consoles. Using rgb solves that

 

Hi,

I use a compatible N64 video cable with SCART lead, so I think the SF is using the RGB signal instead of the composite.

Un saludo

 

Well, NTSC machines work fine with 50hz if you use RGB. So it sounds like you arent using RGB. No N64 outputs RGB from the factory, so a cable sold for the N64 will be composite, unless its a custom 3rd party one.

With an NTSC console, when you switch to 50hz, pretty much all tvs wont display it - as NTSC/50 isnt a valid signal combination.

As I said, all well known.

 

Hi,

Ok, thanks for the explanations, but from my mind, please correct me if I'm wrong, this model cannot produce a 50hz signal natively.

Un saludo

 

Super Mario All Stars checks for 50hz/60hz at boot. You should be seeing an error message if there's no way to get 50hz.

 

Yes it can, but it's a NTSC 50hz signal, which most Tvs will not display. You would need to lift a pin on the video encoder to force pal, as pal can come in pal50 and pal60. Or you can just use rgb, which will work in 50hz and 60hz without issue.

 

Hi,

if you see the screen, there are not black stripes around, so I suppose that the signal is 60hz.

You're right, I was refering to PAL not to hertz sorry for the mistake. But which is the pin on the encoder to lift?, or how to use the rgb to avoid this problem?

Thank you

 

Hi,

I've investigated about the encoder, in my model the pin 19 controls the PAL/NTSC signal, so I will try to lift it.

Un saludo

 

Hi,

I tried to lift the pin 19 of the encoder but the console stops working.

Un saludo