I had a similar video flickering problem with my Wii. I ended up fixing it by buying a new motherboard to replace the old one. They’re only about $15 on eBay, but one thing worth noting is that you will lose all of the data stored on your old Wii’s hard-drive, which usually includes Wii game saves. If you’re okay with this in order to fix it, then it might be the easiest solution.
I cleaned out the shoulder buttons by pulling out the rubber membrane caps and dripping some isopropyl into the button. I used a spudger to repeatedly click the metal contacts. Turned a dead trigger into a perfectly working one!
I was able to stop after this step to clean the shoulder buttons without removing the motherboard. You can pull the motherboard away from the casing just enough to be able to access the shoulder buttons. I pulled out the rubber membranes inside the buttons, dripped in some isopropyl, and repeatedly pushed down on the metal contacts with my spudger. Turned some nearly dead triggers into perfectly working ones!
Make sure to put the Phillips screws back in the right place. Two are shorter and gold-colored while one is longer and silver. You can see the difference in the picture.
I cleaned out the shoulder buttons by pulling out the rubber membrane caps and dripping some isopropyl into the button. I used a spudger to repeatedly click the metal contacts. Turned a dead trigger into a perfectly working one!
I was able to stop after this step to clean the shoulder buttons without removing the motherboard. You can pull the motherboard away from the casing just enough to be able to access the shoulder buttons. I pulled out the rubber membranes inside the buttons, dripped in some isopropyl, and repeatedly pushed down on the metal contacts with my spudger. Turned some nearly dead triggers into perfectly working ones!
Make sure to put the Phillips screws back in the right place. Two are shorter and gold-colored while one is longer and silver. You can see the difference in the picture.