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PostPosted: Sun Nov 11, 2018 3:08 pm 
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Joined: Sun Nov 11, 2018 2:53 pm
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Hello everyone.

Today, I finished my repro Burn-in test cartridge. I tried in my three non-working super famicoms, but I would need some help for understanding what do the errors mean, where do they come from and wether there is any possibility to fix them. I have attached photos of the results to this post.

SFC number 1:
This console is able to load games with good sound but terribly glitched graphics. I suspected from bad PPU1. The results of the tests are totally glitched. It is possible to see a red result in the third option from the bottom. Should that correspond to OBJ L OVER? If so, what does this mean? What is the chip responsible of this failure?

SFC number 2:
This system is able to load games untill sound is supposed to be emmited, when it freezes. It acts exactly the same as a SFC with the sound board removed. I thought it could be a bad APU (replaced the sound board with a working one and the problem persisted). The results of the tests indicate a bad OAM (01 FAIL). How should I interpret this? Is it a bad CPU?

SFC number 3:
Not even able to load the cartridge. No video output (neither a black screen). Revised and good power circuit and capacitors (LED turns on and every IC has enought voltage supplied). I have an oscilloscope to test the board depper. Any advice about where should I start? I know this may also be a bad CPU. Any way to get sure about that?

Any help will be welcomed.
Thank you very much.


Attachments:
WhatsApp Image 2018-11-11 at 14.39.27.jpeg
WhatsApp Image 2018-11-11 at 14.39.27.jpeg [ 135.73 KiB | Viewed 1192 times ]
WhatsApp Image 2018-11-11 at 14.35.09.jpeg
WhatsApp Image 2018-11-11 at 14.35.09.jpeg [ 142.79 KiB | Viewed 1192 times ]
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PostPosted: Sun Nov 11, 2018 3:34 pm 
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Joined: Sun Mar 27, 2016 7:56 pm
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OAM is the memory used for sprite attributes, which is located in PPU1.


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PostPosted: Sun Nov 11, 2018 3:53 pm 
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According to these logs, a black screen on a SNES has lots of chances to be caused by a bad WRAM.
There's also some more explanation about other errors. Hope this helps!
Good luck!


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PostPosted: Sun Nov 11, 2018 4:07 pm 
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Joined: Sun Nov 11, 2018 2:53 pm
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Nicole wrote:
OAM is the memory used for sprite attributes, which is located in PPU1.


Nice. Then, does that mean that I should replace PPU1? It seems strange to me, since everything pointed to a failure in the APU or sound system. Any clue about what is that 01 code?

Fisher wrote:
According to these logs, a black screen on a SNES has lots of chances to be caused by a bad WRAM.
There's also some more explanation about other errors. Hope this helps!
Good luck!


Thank you for the link. According to that, it may be either a bad WRAM or a bad CPU. Any way to test the CPU with an oscilloscope?

Thanks.


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