Wii U not turning on and has power light

[Pepeu]

I bought a second hand Wii U with this issue to see if I can fix it because it was really cheap for something that came with gamepad, power supply, sensor bar, etc.
So, when I press the Power Button or turn on using the Gamepad, the red light blinks but nothing happen.
I opened the motherboard and found a mising SMC capacitor and another one that wasn't working.
I changed the capacitor and put the SMS one in the right place, but still no success.
I think the RAM is responsible for this, it seems the voltage is not going to the chips, and probably that's why the console is not turning on.
What I did? I bought a bricked one with the 160-0103 error to replace the parts.
Still, I'm not sure if the RAM is indeed the responsible.. what do you guys think?