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Thread: Wii Won't Power on After Bad Power Supply

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    Wii Won't Power on After Bad Power Supply

    Hello everyone,
    I have an unmodded Wii which will not turn on. I don't have its original power supply for it so I thought I'd use a PC power supply with the 12V output. However like an idiot I think I reversed the polarity and now it will not turn on. I have also tried the original power supply, which does work on my other Wii so the power supply is not the issue.

    How do I fix this in the Wii? I have searched other threads where they say to unplug the power supply to allow the capacitors in it to discharge, but this time I know the supply is not the culprit because it was a PC power supply that caused this issue. I measured it with the multimeter and the output was indeed 12V, not more.
    Thank you in advance for your help, I hope this is not too dumb of a question.

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    skellinator's Avatar
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    If you had a bad power supply then you could just get a new one. However, having hooked up with reverse polarity, it sounds like you screwed yourself.

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    That's what I thought too. But after searching on some other sites, people say that the PWR P11 fuse can be to blame. I'm hoping that tripped and protected the Wii.
    http://wiire.org/images/4/4a/Wii_mb_top.jpg


    Here's something else about it: Nintendo Wii Fuse towards the bottom. Anyone have any experience with changing the fuse? Is this the correct way to fix it?

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    I would use this guide to disassemble your Wii. I have never changed the fuse in one, but I have changed DVD drives. You will need a Triwing Screwdriver and a Precision Phillips Head Screwdriver.

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    Thank you for your answer. Before I open it up though I'd like to know if anyone else has had this problem. I know there must be someone here who has accidentally flipped the polarities and has attempted this, so I'd like to know if that's the right fuse that's causing the problem, since the OEM power supply is fine.

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    Maybe if you can get a hold of Bad_Ad84, he has alot of experience with the internals of the Wii. Take a look at this thread.

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    I sent him a PM so hopefully he can help. Thank you for the reference!

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