Blown Famicom capacitor

[budpikmin]

Hi There,
I'm new to Famicom World. My apologies for asking for help with my first post.

I recently bought a couple of uk 3pin plugs to work with my famicom and fami disk system on ebay.
The listing said that the plugs had no need for a stepdown and worked with the famicom.
So I decided to switch the plugs over and get rid of my enormous stepdown converter and switched everything on.
The famicom made three very loud bangs followed by a loud bang coming from the plug.

After opening up the plug I found a blown voltage capacitor and interestingly no fuse.
I opened up the famicom and also found a blown voltage capacitor. I've asked the seller for a refund on the plugs as they're obviously poor quality.

My issue now is that the famicom still works but if I use any plug other than the original one with the stepdown (I often use a uk megadrive plug) the sound goes all crackly.
I'd like to replace the capacitor with a new one but I have no idea what to use. Could anyone please let me know what type of capacitor I should buy?

[casino]

Just post foto of the transistor here. There should be somthin like    BF245/AC126/ or some sort of marking.

[fredJ]

Do you have photo/info of what power supply you used?

[budpikmin]

Sorry it's taken so long to post the photos.

This is the photo I took of the famicom board. I've circled the blown capacitor..


Unfortunately the plastic casing is mangled and completely unreadable..


I know it's not important but this is the inside of the blown plug I bought..


Thanks for your help!

[casino]

Maybe somebody with more experiences can give you exact capacitor nuber but in my humble opinion you need at least recap the while thing, or maybe even change the board.

[budpikmin]

I'm hoping a new board won't be needed. I've removed all that was left of the capacitor and now I just have the two pins sticking up from the board. The famicom is still working and the board doesn't appear to be damaged in any way. Is it not as simple as removing the old capacitor pins and soldering in a replacement?

[ericj]

You should replace the voltage regulator on the Famicom's PCB, and if there are any resistors and diodes in the same circuit as the blown capacitor, they should also be replaced.

[budpikmin]

Thanks. Could you please tell me which voltage regulator the famicom uses?

[Pikkon]

The famicom uses a 7805 voltage regulator.

[thepandaofnom]

What model number is your famicom. If I have the same model number Ill take mine apart and tell you its cap values. Also did you cheek the power output before using that power supply on your famicom. I hate using knock off power supply because they often use bad parts or don't regulate the power properly witch can as you have experienced damage your equipment.

[iStreet]

I dont want to sound rude, but this is an other lesson for; Dont go cheap, or believe what is said by the seller.. !  Always use authentic/original parts!!!!
Good luck with the repair..

[thepandaofnom]

I agree with you and its easy to do that in places that have 100v or 110 v power but in the uk  or other 240v countries it is a bit harder. even with step down converters if they are crappy they can jolt you official power supply.

[aha2940]

I know it's not for everybody, but testing output voltages on regulators / converters etc. with a multimeter is always a good idea.

[fredJ]

Ugh that was a terrible power supply. I can't say what happened, but I wonder if they put the cap on the wrong direction ??

I sell European famicom power supplies that I buy from a source in China. The factory tests them before shipping. But I always test them first on my super famicom so I don't damage the sensitive FC.

I don't recommend buying from "some seller" on ebay, I've also bought power supplies that was crappy quality from ebay so I don't do that anymore. Anyone can solder some components and call it a power supply.

A reliable source in the UK is http://www.consolegoods.co.uk/

If it works fine after replacing the cap, I'd just do that.

If the famicom works well, you don't need to replace the voltage regulator... If it has weird graphical glitches, black/white picture (not because of PAL TV), doesn't power on, etc, then regulator replace is a good idea.

[please help with famicom]

is the capacitor that is used in the famicom this one?... 10.0uF 50V 20% Radial Electrolytic Capacitor