Hardware SNES Displaying off colours, any solution?

[Myoon_Island]

I was playing Super Mario World and saved my game, then the colours suddenly changed to a green or blue hue. The hue changes when I turn the console on and off. I bought another console and it works with the cartridges. I suspect it's the PPU that's the problem, but I'd like other thoughts and solutions. My console has two PPUs and I have a GameBit screwdriver and I've opened it up before. I tested it with Super Mario All Stars and supplied images. Thanks!

 

[tech3475]

Does it also happen if you use a different output? I.e. RF, scart or composite?

 

[Myoon_Island]

Does it also happen if you use a different output? I.e. RF, scart or composite?

Yes, AV and RF both have the same outcome.

 

[tech3475]

Yes, AV and RF both have the same outcome.

Have you tried the PSU from the new unit (presuming the same model)?

 

[Myoon_Island]

Have you tried the PSU from the new unit (presuming the same model)?

Do you mean PPU? The graphics processor for SNES? If so, my new one has PPU1 and PPU2 combined, it was a later release by Nintendo. Also the PPU's are chips soldered onto the SNES motherboard.

 

[tech3475]

Do you mean PPU? The graphics processor for SNES? If so, my new one has PPU1 and PPU2 combined, it was a later release by Nintendo. Also the PPU's are chips soldered onto the SNES motherboard.

No PSU (Power Supply Unit).

 

[Myoon_Island]

No PSU (Power Supply Unit).

Oh, sorry!
I use the same power supply unit I used on my broken one on my new one. If that doesn't make sense, I use the same Power supply for both.

 

[tech3475]

Oh, sorry!
I use the same power supply unit I used on my broken one on my new one. If that doesn't make sense, I use the same Power supply for both.

At this point I would open it up and check for anything obvious e.g. capacitors, corrosion, dodgy solder joints, etc.

Do you have an Everdrive by any chance? There may be a diagnostic ROM available to test with.

A few years ago my PAL unit stopped working and I suspect that had a faulty IC given the diag readout and other observations (e.g. correct voltages, master clock, etc.).

That said, I ended up getting a relatively cheap modded SFC off ebay with a disintegrating case, the latter of which I used my old PAL case to replace with, although I had to dremel one support to get it to fit.

 

[Lostbhoy]

Apparently this is common with the double chip PPU devices so it may need replacing I'm afraid. There are youtube videos on how to do it but soldering will be required if you go down that route however a donor device is the only way you'll get them.

 

[duwen]

It looks like the sort of issue you might get if you're using SCART cables but they're not configured with sync on luma... but you say you're using AV, do you mean composite?

 

[Deleted member 301661]

Apparently this is common with the double chip PPU devices so it may need replacing I'm afraid. There are youtube videos on how to do it but soldering will be required if you go down that route however a donor device is the only way you'll get them.

That's too bad, but if both rf and AV give this problem while a different snes doesn't
There is one more option: try mod the crystal, for this might have to do with pal/ntsc input.
I mean this could be an output frequency problem.
By the way, the mod described above will not change the region...

 

[Myoon_Island]

At this point I would open it up and check for anything obvious e.g. capacitors, corrosion, dodgy solder joints, etc.

Do you have an Everdrive by any chance? There may be a diagnostic ROM available to test with.

A few years ago my PAL unit stopped working and I suspect that had a faulty IC given the diag readout and other observations (e.g. correct voltages, master clock, etc.).

That said, I ended up getting a relatively cheap modded SFC off ebay with a disintegrating case, the latter of which I used my old PAL case to replace with, although I had to dremel one support to get it to fit.

I unfortunately don't have an Everdrive... I've opened it up before and it looked all good. If I find an extremely cheap THIRD console I'll replace a few things... Thanks anyway!

Post automatically merged: Dec 30, 2024

That's too bad, but if both rf and AV give this problem while a different snes doesn't
There is one more option: try mod the crystal, for this might have to do with pal/ntsc input.
I mean this could be an output frequency problem.
By the way, the mod described above will not change the region...

Thanks! I'll have a look at that later... Would you mind explaining the PAL NTSC situation a bit more? Thanks!

Post automatically merged: Dec 30, 2024

It looks like the sort of issue you might get if you're using SCART cables but they're not configured with sync on luma... but you say you're using AV, do you mean composite?

Sorry, I was thinking you ment component. But yes, it is composite a/v. And I don't use SCART cables.

Post automatically merged: Dec 30, 2024

Apparently this is common with the double chip PPU devices so it may need replacing I'm afraid. There are youtube videos on how to do it but soldering will be required if you go down that route however a donor device is the only way you'll get them.

That's what I thought... Well, if I come across a non functional one I might swap out the PPU. Thanks.