Karaoke PSU blown

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Tyxy
shadow
Posts: 8
Dreamcast Games you play Online: F355 and Quake

Karaoke PSU blown

Post by Tyxy »

Hi everyone! So yesterday I got my Dreamcast Karaoke (SegaKara), and as you can imagine, i was pretty excited. As I live in Europe, I had to get a converter from 220V to 100V, which is what the SegaKara uses.

Well, today I plugged the power on the SegaKara, only to realise (too late) that I connected the 220V regular cable... And the SegaKara exploded.

After opening it up, I can see that what looks like a capacitor (see image) has blown, and got everything messy with some kind of liquid. And judging by the photo that retrostuff.com uploaded some time ago (see image), I can safely confirm that (at least) the capacitor has exploded. As for the rest of the board, it looks fine, nothing is burnt and nothing seems to have broken, so maybe the capacitor took one for the team? Idk.

The thing is: does anybody know about this? Can it be saved? My plan is to just change the capacitor for another one with the same specs and pray.
Attachments
what the board should look like
what the board should look like
my blown capacitor
my blown capacitor

xzer0PL
rebel
Posts: 20
Dreamcast Games you play Online: Blocked ports

Re: Karaoke PSU blown

Post by xzer0PL »

You can measure the other parts with multimeter. Check diodes, stabilisers and other. Do you see picture? It says 200V. You can replace it with same value 47uF but use 400V.

Tyxy
shadow
Posts: 8
Dreamcast Games you play Online: F355 and Quake

Re: Karaoke PSU blown

Post by Tyxy »

xzer0PL wrote: Sat May 10, 2025 5:24 am You can measure the other parts with multimeter. Check diodes, stabilisers and other. Do you see picture? It says 200V. You can replace it with same value 47uF but use 400V.
Do you think it would hold the 220V well with a more powerful capacitor?

Tyxy
shadow
Posts: 8
Dreamcast Games you play Online: F355 and Quake

Re: Karaoke PSU blown

Post by Tyxy »

Tyxy wrote: Fri May 09, 2025 6:08 pm Hi everyone! So yesterday I got my Dreamcast Karaoke (SegaKara), and as you can imagine, i was pretty excited. As I live in Europe, I had to get a converter from 220V to 100V, which is what the SegaKara uses.

Well, today I plugged the power on the SegaKara, only to realise (too late) that I connected the 220V regular cable... And the SegaKara exploded.

After opening it up, I can see that what looks like a capacitor (see image) has blown, and got everything messy with some kind of liquid. And judging by the photo that retrostuff.com uploaded some time ago (see image), I can safely confirm that (at least) the capacitor has exploded. As for the rest of the board, it looks fine, nothing is burnt and nothing seems to have broken, so maybe the capacitor took one for the team? Idk.

The thing is: does anybody know about this? Can it be saved? My plan is to just change the capacitor for another one with the same specs and pray.
UPDATE: I took the karaoke to a specialised shop near me and now the karaoke at least turns on, but doesn't give image to the RCA cable, only sound. So my fear is that something else blew up. The people at the shop told me that after changing the capacitor, they tested with multimeters and such, and didn't get any weird readings, so the karaoke should work again, but clearly doesn't.

I'll take it to the shop again as soon as I can, but in the meanwhile, does anybody know of another component that could have been "overcharged" and be broken? I can't think of one

User avatar
Scrivani
Metallic
Posts: 816
Dreamcast Games you play Online: Almost all

Re: Karaoke PSU blown

Post by Scrivani »

Make a test with just the dreamcast with the av cable to make sure is ok.

check the pins on the av in/out of the karaoke and the pins on the mini cable that connect both devices.
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