Yes, you need to add the 100nF caps where they are missing, and add the 2 x 47pF caps to positions C5 and C6.
Thank you for quick answer.
fixed pcb´s, i feel a bit louder and also a bass enhanced:
http://subefotos.com/ver/?facfb216bf788a237937429bdef9a025o.jpg#codigos
http://subefotos.com/ver/?e3b1c3a87c2999360dfc841b33017c3do.jpg#codigos
http://subefotos.com/ver/?fe0c17c89b3e1b9d1f40b2beca21207ao.jpg#codigos
http://subefotos.com/ver/?b63219b5a5edb39634ea971282e545e5o.jpg#codigos
Thank you for your research. regards
Did adding a cap to C3 fix anything specific also? Whenever I see people ad caps to their multicarts, they never place one on that spot by the 8 pin harness that connects the pcbs. That always seems to be the one that people leave alone.
I have a 138 in 1 cart and plan to do this mod. Can you please provide a list of parts needed. I see the pictures but I would like to know the amount caps to order. Thanks man, I appreciate it and your work on this gave me incentive to register to this great forum.In summary, the SDRMPX and SDPMPX bypass caps (47pF) make the biggest difference to PCM sound on all these carts, but its worth doing all of the mods imo.
This has fixed sound problems in many games across all the carts below. The 161 in 1 in general suffers less from the PCM issues, but it IS affected. Pulstar is now fixed on my 161 in 1, as well as Puzzle Bobble, and a few other games which had random sound issues.
138 in 1, and 120 in 1
https://www.dropbox.com/s/nx0fhk0eimacrpi/multicartfix.zip?dl=0
This also fixes Pulstar on the 161 in 1 for me as well =D The 161 in 1 needs traces scratching (like the 138 in 1 does). The 120 in 1 seems to have 2 pads for the caps already.
161 in 1 (150 in 1 also?)
https://www.dropbox.com/s/kdf1bd2fqow6xkv/161 in 1.jpg?dl=0
Here's the link to the thread that lead me to the fixes. http://www.neo-geo.com/forums/showt...mp-Board-Slot-Compatibility-regards-PCM-sound I've posted this seperate thread due to the title hopefully being more useful. People might never look into the original thread. Hope someone finds this useful!
I traced the pins and they go to A17 and A18 on the PROG bottom. Can't find anymore info on the pins though . Early on to populate them with 100nf caps but it gave me a calendar error. All the boards I've seen that are close to mine have something there, but I can't quite make it out. I'm at a lose, maybe i'll leave it. Would love to figure it out though if you have any sources.
Could you upload some photos of the mods you've done?Just got done doing the mod on my 138 in 1, now I have the problem where I don't get all sounds. Like for example the music for games like baseball stars 2 or king of the fighters 94, doesn't work, the voices or sound fx and such do work. Any ideas? Thanks
I'll check the cable, as I noticed the hot glue joint that was there fell off and now the cables dangle. I'll for check continuity, this happened after I took the cart apart. Did this sound happened to you as well?I cannot see anything specifically wrong there so either the board interconnect cable has a bad connection (sometimes one wire breaks on them), or you've got a bad solder point somewhere or something like that. These boards are so bad quality its easy to make a working set stop working just by taking them appart. I had to reflow the solder all around one of the large CPLDs after taking one of my 138 in 1's to bits. That fixed the problem on mine. It's a case of inspecting as closely as possible to see where the problem might be.
Is there anyone here on the forums that can reliably do these fixes? I have both the 120 and 161 in 1 carts and really would like to find a reliable modder that I can pay to do the fixes for me. if anyone knows of someone who can do these repairs, please let me know! Thanks
I'll check the cable, as I noticed the hot glue joint that was there fell off and now the cables dangle. I'll for check continuity, this happened after I took the cart apart. Did this sound happened to you as well?
Thanks
Had had almost the same sound fault occur due to the bad solder points around the large square CPLD chip on the board with the VROMs. I had to reflow the chip entirely and then cleaned up the flux and it then finally came back to normal. That happened on one of my 138 in 1s.
Another interesting discovery is that someone mentioned they didn't get sound on Blues Journey - I can support that by saying I've noticed that on the 161 in 1 (possibly other carts too) if you boot the cart from cold and go straight into Blues Journey there's no sound - this is some kind of intialization bug. If you boot the 161 in 1 from cold and go into any other game, then hold reset to go back to the menu, and then go into Blues Journey - the sound works fine on that game.