TurboDuo - no sound - replaced some caps

[Cinder6]

So, I recently got a TurboDuo. It has no sound whatsoever (whether via the AV cable or headphones). After doing some reading, I found D-Lite's tutorial to (potentially) fix it by replacing the post-amp capacitors. I did so, and still have no sound.

Are there more capacitors I should look at replacing? If so, are they the same kind (10uF, 50V)?

Thanks

[bones11]

I'm in a similar boat, have a TurboDuo with no sound, and was thinking about replacing the caps. How many have you replaced so far? I've read some people can get sound working by replacing 5 or 6 caps, and others had to replace upwards of 50 to get it singing.

[Cinder6]

I've only replaced the two post-amp caps. I'll replace the pre-amp ones, just as soon as I confirm they're 10µF.

[jb143]

Do they not say? Electrolytic caps usually say right on the side what they are.

[Gameguy]

Just check this link out, there's a pic with all the capacitors with the values listed.

http://www.pcenginefx.com/forums/index.php?topic=3249.0

[Cinder6]

Do they not say? Electrolytic caps usually say right on the side what they are.

I'll admit I didn't look as carefully as I could have (I did a bit more than a cursory glance), but I didn't see it on mine. I was looking at the tops, not the sides, though.


Just check this link out, there's a pic with all the capacitors with the values listed.

http://www.pcenginefx.com/forums/index.php?topic=3249.0

Awesome, thanks! Looks like I'll need two 10µFs and one 22µF.

[jb143]

This always comes up in threads like this but it's always worth repeating. When finding replacement caps don't waste your time looking for an exact voltage match. As long as it's equal or greater than the listed rating you'll be fine. Those are pretty common values...you should be able to find them at radio shack no problem. Probably even in an assortment pack.

[Cinder6]

This always comes up in threads like this but it's always worth repeating. When finding replacement caps don't waste your time looking for an exact voltage match. As long as it's equal or greater than the listed rating you'll be fine. Those are pretty common values...you should be able to find them at radio shack no problem. Probably even in an assortment pack.

Yeah, I knew that much, at least. Good advice, anyways. Thanks.

[FABombjoy]

Looking at the cap replacement guide, draw a line from the headphone jack to the "2" in the board number (2804B). From my own experience, I'd first replace all the caps north of that point. Clean the board under every cap you remove. Don't replace the regular electrolytics near the 2 power regulators as they're probably fine (unless you can see them bulging / leaking).

Afterward, if you still have audio problems with both CDs and HuCards, then it's possible that one of the old caps has damaged the board somewhere. You'll need to follow the audio signals backward until you figure out where the problem lies.

[Mobius]

This always comes up in threads like this but it's always worth repeating. When finding replacement caps don't waste your time looking for an exact voltage match. As long as it's equal or greater than the listed rating you'll be fine. Those are pretty common values...you should be able to find them at radio shack no problem. Probably even in an assortment pack.

For what it's worth, I replaced a capacitor in a busted Amiga CD32 controller and took this advice... But it didn't work. Then I tried another capacitor that matched the original's specs, and it worked perfectly. So yeah, it seems like sometimes it can matter.

[jb143]

For what it's worth, I replaced a capacitor in a busted Amiga CD32 controller and took this advice... But it didn't work. Then I tried another capacitor that matched the original's specs, and it worked perfectly. So yeah, it seems like sometimes it can matter.

Not to question you or anything but It's more likely that the replacement part was bad or not installed correctly. The caps voltage rating is a measurement of what it can handle so a higher rating does not matter. If the circuit uses 5V and you stick a 25V cap in there it will handle the voltage. If you stick a .5V cap in there it will likely blow.