I did it ( original 22uf value with ground mod ) , and unfortunately results are the same.
This fault is hard to find.
If nobody has the solution or other idea to find the fault, maybe if understand how the D/A adjustment works exactly i will maybe able to find the fault and repair it. But i don't exactly understand how the D/A adjustment works. I understand that is the DAC calibrating but how it is done exactly?
Any ideas are welcome.
thanks to all.