Question No power to wii, light not turning on.

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Jan 20, 2026
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Hi,

I've been trying to convert my Wii into a portable Wii and after testing the new battery to the battery port everything seemed to be fine (I was able to play unplugged from the wall for over 30 mins before the battery ran out, I don't think it was fully charged.). A couple of days later I tried to test the lifespan of the battery after fully charging it but it no longer seemed to power anything at all, I wasn't sure if that was just not getting the connections right, but when I reconnected the normal cable there was still no power. I'm assuming I've probably managed to short something somewhere, but I have no idea what or where to start testing things.

Could anyone help explain how to test the various components to find where the short could be or if it might be something else. Where do I put the multimeter terminals (red and black) on which components, please highlight on the images as I don't know which most bits are.
I know that it's not an issue with the power cable as I have tried a second one and tried many things that other places have suggested to try and fix it if that was the problem.

The Wii is modded with a couple of things on an SD card and that was working fine for about a week with no issues so I don't see why that would have caused the problem.
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To have a short on the board you would have had to do some soldering to create an errant blob or wisp of conductive material that bridges a voltage location to ground or another voltage location. If you have only plugged an external battery into the power socket, you won't have a short on the Wii.

When you did your battery test before, was the heatsink in place? You have a 6 layer Wii, which use 50% more power than a 4 layer Wii and run much hotter. It you ran it for 30 minutes without a heatsink, it's probably dead from thermal strain.

When you connect a power source, do you get any front lights or is it totally dead?
 
To have a short on the board you would have had to do some soldering to create an errant blob or wisp of conductive material that bridges a voltage location to ground or another voltage location. If you have only plugged an external battery into the power socket, you won't have a short on the Wii.

When you did your battery test before, was the heatsink in place? You have a 6 layer Wii, which use 50% more power than a 4 layer Wii and run much hotter. It you ran it for 30 minutes without a heatsink, it's probably dead from thermal strain.

When you connect a power source, do you get any front lights or is it totally dead?
Yes the heat sink was in place, I only just took it off to take the pictures.
There are no front lights, totally dead.

Do you have any other ideas of what could have happened?

Thanks!
 
Yes the heat sink was in place, I only just took it off to take the pictures.
There are no front lights, totally dead.

Do you have any other ideas of what could have happened?

Thanks!
I think I've managed to check the F2 fuse properly and that wasn't working and I've use some fuse wire to bridge it and it worked!! Where would you reccomend to get a replacement F2 fuse?

Thanks!
 
If you're just running it off a battery the fuse *shouldn't* be required. It's mainly there to stop a lightning strike or severe power brick failure from frying the system.

IIRC the fuse rating is printed on the top of the fuse as a number. It should be 6 amps or some such. Can't remember the footprint though, you'll have to physically measure the fuse dimensions and check the SMD sizing chart.
 
I have a Wii motherboard in front of me that's around your vintage, there's a little marking on it that says 6.3, which means it's rated for 6.3 amps. I did some searching on Digikey and found one with the part number 0679L6300-01 that should be a drop in replacement. It's 6.1mm by 2.54mm, exactly the right physical size.

That being said, a blown fuse is usually indicitive of some other problem. Fuses don't just blow for no reason! :) If something else on the board is damaged, a new fuse might blow again after some time. It's totally possible that you just touched the wrong thing while it was on by accident though. I've done that countless times.
 
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