I had 2 x used ones and did have one x working but went away for one x night and the ink lines leaked over the print head! Gutted!
i used a multimeter on those little fuses and i will never know what was blowing them i just gave up on it
So many possibilities like a car when it goes wrong can you fix it? do you know what is causing it?
So many possibilities so i gave up as so time-consuming
could be the mainboard is faulty
fuses
FFC Cables in wrong, did you change anything over such as FFC Cables? printhead cables etc?