dafa_123 Posted April 11, 2020 Author Share Posted April 11, 2020 As I suspected, on the defective SNES, I get no signal on pin 100 of PPU2 U3. When I compare to a working SNES (See picture), which gets a 15kHz signal on pin 100. Does anyone know if it would be possible to create a replacement 15kHz RSYNC using an external circuit? Would it work? Thnaks. Quote Link to comment Share on other sites More sharing options...
Bratwurst Posted April 11, 2020 Share Posted April 11, 2020 16 minutes ago, dafa_123 said: Does anyone know if it would be possible to create a replacement 15kHz RSYNC using an external circuit? Would it work? I'd thought of doing this for a Neo Geo with bad sync output but was able to source a donor board to rob the replacement chip from it, so never bothered to try. With no explicit data sheet available that outlines what is going on in the chip die (because custom Nintendo package) there'd be a lot of guess work and trial and error. Quote Link to comment Share on other sites More sharing options...
dafa_123 Posted April 11, 2020 Author Share Posted April 11, 2020 1 hour ago, Bratwurst said: I'd thought of doing this for a Neo Geo with bad sync output but was able to source a donor board to rob the replacement chip from it, so never bothered to try. With no explicit data sheet available that outlines what is going on in the chip die (because custom Nintendo package) there'd be a lot of guess work and trial and error. Indeed. I don't mind trying. I only need a schematic to built a 15kHz signal generator that can replicate the one on the SNES. I have a working SNES to compare the signal to. You don't have such a schematic by any chance? Quote Link to comment Share on other sites More sharing options...
Bratwurst Posted April 11, 2020 Share Posted April 11, 2020 Sorry I don't! Quote Link to comment Share on other sites More sharing options...
alk0v Posted December 6, 2021 Share Posted December 6, 2021 Hello. Do you found problem? I have the same issue: no signal on the pin 100 of S-PPU2. Quote Link to comment Share on other sites More sharing options...
dafa_123 Posted December 7, 2021 Author Share Posted December 7, 2021 I am waiting for a replacement PPU. Quote Link to comment Share on other sites More sharing options...
alk0v Posted December 7, 2021 Share Posted December 7, 2021 Is it available for ordering? Quote Link to comment Share on other sites More sharing options...
dafa_123 Posted December 7, 2021 Author Share Posted December 7, 2021 Got it used from a friend in France. Should be getting it in a few weeks. Quote Link to comment Share on other sites More sharing options...
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