I bought
radioberry board on aliexpress, but the seller sent me broken device, it don't works. According to tests, unfortunately the root of cause is dead
AD9866 chip. It has clock on the input, but no clock on the output (both pin 19 and pin 61 are always zero) and there is no sign of life on its outputs.
I'm thinking to try to repair it by replacing
AD9866 chip. But it looks not so easy. I never soldered such chips with a thermal pad on the bottom and don't know how to solder it properly. Could you please help?
Does thermal pad should be soldered together with usual pins with heating, or it should be soldered later by putting some solder into through hole in PCB?
What is the best way to desolder it and avoid damage and unsolder for other components?