Hello everyone, new old member here, recently got into modding systems an I ran across a pc engine duo that needed a recap (or so I thought), ordered cap kit from console5 and proceeded to do my first recap job, took me a long time so I was happy when I was done, but unfortunately CD audio didn't work, if I turn the volume up all I hear is static noise and some ocasional cracking, hucard audio however is loud and clear. The only thing I'd notice is using 4.7uf 50v caps instead of 16 or 25v ones, console5 sent me the wrong ones and apologetic he was going to send me replacements, but since I'm in Mexico I opted to get them locally, so 50v was the only one I could find.
It's been days already since I've been trying to get it working, I've reseated some caps and I'm sure they're all fitted correctly (no shorts, continuity is there to where they're supposed to go, etc), so now mi conclusion is that there must be a damaged component or trace somewhere, after reading all this thread I found out about the audio diagrams Charlie posted, I'm looking at the TurboDuo Audio Multiplexer diagram, since hucard audio works I'm assuming the problem lies at AVC (u505) or at some point before that, am I correct? All 4558 and 4560 ICs that faced upward had normal voltage apparently, well some 4558 had voltage closer to 7 at pin 8 instead of 8 but I think that's normal, one of the voltage divisors is providing 7v so that's got to be the reason (my ac adaptor provides 9v instead of 10).
Sorry for the lengthy post, it has been more challenging than I expected, I welcome any ideas any of you guys might have, hopefull I can get this thing to work, thank you everyone!
