bricked wii, but I never installed any homebrew programs

My Wii is bricked (only the black screen comes up) and I have never put any sort of modifications to it. A while ago I sent it into a shop to get fixed because it would just freeze in the middle of my games and would eventually not make it past the safety warning screen. When I got it back from the shop it worked for a while and now it just comes up with the black screen. My main concern is losing all my saved game data, so is there any way to transfer that data to a new Wii or even to fix it? Thank you.

Without boot mii as boot 2 there may not much can be done. But if you said you never run any homebrew then you wouldn't have bootmii. If you never had homebrew on it send it to nintendo and see if they will fix it. There is another method cknow called savemii and savemiifrii, I don't much about it, but its on the wiki at wiibrew.org

savemiifrii is good to use it really works you must mod a gamecube controller to press all butttons on the control at once must be plugged into slot 4 and must be officl controller no 3rd partys. or a gamecube ddr mat.