thanks for the advice,i will see how it goes on 1080i as the resolution is good enough but if it doesn't last i will try to find someone who can repair it or maybe get another one if Haxchi is still a thing
I would say this is a typical sign of the begin of VRAM`s death.
And yes: These problems tend to get MUCH MUCH WORSE over time. So it won`t be staying like this. Looking so harmless like here where you at least can still see 95% of the screen´s content.
Faulty/dying DRAMS typically have simple errors at the start and when they are finally done, they produce only "chess-board"-looking like graphics.
That means you won´t be able to even do anything with your device any longer. Many Graphics-cards die because of faulty/dying Vram, not only because of the GPU itself.
Well. There is another thing you could try.
And that is the bake-oven-method. You ever heard about that? But chances aren´t big i assume. And you might kill your WiiU by using that. So i would not risk it.
Since normally that method is used for faulty GPUs and only for graphics-cards and motherboards.
Nobody knows what would happen if you put a WiiU-motherboard into an oven.
If i were you, i better would start looking for a) a replacement-WiiU (your best method, remember you can transfer ALL DATA on your new WiiU, but only if your old model still works good enough (this is good enough as it´s just some random-GPU-output errors). Cost about 100$ for a replacement WiiU-console-unit.
b) or for the necessary Samsung DDR 3-Ram-chips. And a good repair-guy which can do the soldering. First you gotta solder out your faulty chips from your console and then you gotta solder in new ones or at least WORKING ones (you may as well buy a defective WiiU where the Ram is still working and use those, costs 20$).
But replacement Ram-chips of WiiU are pricy. And a repair-guy takes 50$/hour!
So yeah. it´s your decision. The question is: HOW MANY $$$$ do you have?
And how much time do you have, in which you could live with a non-working WiiU?
Repairs can take some time dude. I heard some Ebay-guys sold working WiiU-replacement console-units only for something like 50$. So yeah. Like i said: Hard decision. It´s up to you what you gotta do now.
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Wait. Please make sure (before trying to repair your WiiU) that it´s not a faulty cable. Take another cable, plug that into WiiU and your TV and watch what happens. if the error is gone then it´s just a faulty cable. HDMI-cables can be easily damaged after all. I heard lots of horror-storys about faulty and or suddenly no more working HDMI-cables as well.