Hello everybody

I have Hp Laserjet pro color does not turn on their is no power i check the power source all good i check the cable its good then i check the printer power supply i found that the fuse on the power supply board is blown so i order a new power supply i connect the new power supply also didn’t work so i check the same fuse in the new power supply i found it blown to so i make my research from the service manual i found that may be its the DC controller or the Formatter problem so i bought new DC controller and formatter and a new fuses , i install the new fuse in the power supply then i put all the new stuff back also it does’t turn on so i check the fuse on the power supply also it blown for the third time i can’t find the problem i give please help