Amerika Posted November 25, 2018 Share Posted November 25, 2018 (edited) I captured some footage of the issue so please give it a listen. It's bizarre. I'll copy/paste what I put into the videos description to give you guys an idea of what this thing is and what has been done. This is a model 2 Sega CD that I picked up which was sold for parts/broken. Somebody had done a really bad repair job on it and the Q301 transistor and the fuse was blown out. I also removed the new caps they put in and replaced all caps with my own. That fixed the unit and CD's read just fine (even Sylpheed) but I get the sound issue you hear in the video. This is a Funai motherboard (the version with the out of place daughterboard) and it also has the SOHOT4 Samsung laser in it rather than the Sony KSS-210A. And I did replace c412 with an 47uF 6.3v capacitor. Maybe that capacitor isn't doing what it should be? I've also cleaned up and re-greased everything that could use it and I also adjusted the pots (had to do it blind since I don't own a scope..but I took photos of stock positions) and no change. I guess one of the new caps I used could be bad. I did reflow all of them just to be sure. Any other ideas? Edited November 25, 2018 by Amerika Quote Link to comment Share on other sites More sharing options...
cn817166 Posted December 22, 2019 Share Posted December 22, 2019 Pretty much getting this same issue, have you ever solved it ? No clue what it is lol. Quote Link to comment Share on other sites More sharing options...
Amerika Posted December 22, 2019 Author Share Posted December 22, 2019 24 minutes ago, cn817166 said: Pretty much getting this same issue, have you ever solved it ? No clue what it is lol. I have not. I have never went back to look at it since I own a few other sega cd's that I've repaired that work perfectly. I'll track it down one day. Quote Link to comment Share on other sites More sharing options...
cn817166 Posted December 28, 2019 Share Posted December 28, 2019 Took a break from it for a while. Came back, and checked everything underneath a few more times. After probing and checking everything on that schematic, I found one tinyyyyyyy barely even noticeable broken trace near C222 (under the board where the negative of C222's ground is) and patched it with a new trace wire and Digital Audio is back perfectly. I had 4 of these caps that just wouldn't budge, and took extra heat and force to remove. Messed up but glad I found it. Thanks a lot. Sometimes ya just gotta take a step back and come back to it. Has to be broken trace or something similar. Check the 3 via's near C222's negative post, that's where my issue was. Thanks for your post. Quote Link to comment Share on other sites More sharing options...
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