Here is an image that shows the different plugs for the different power supplies

The one to be tore down is Model # HP-AW175EF3. Input 100V-127V output 12V 14.2A, 5V 1A

Remove all four rubber feet from the bottom of the PSU. Simply flip them out with a small screwdriver or similar instrument.

Once the rubber feet are removed, there will be another plastic cap visible.

Insert a small screwdriver or similar instrument

and just flip it out.

With the rubber feet and the plastic cap removed, the Phillips screws will now be visible.

Remove all four of those

All the Phillips screws are 3/4 inch long. Here are the feet, caps and screws that needed to be removed.

Use a plastic opening tool, or similar instrument, to widen the gap between the top and bottom half of the PSU.

Slide the opening tool along the gap will release the tabs that hold the two parts together.

Do the same on the opposite side of the PSU

Once the snaps are released by the opening tool,

gently move the two parts apart. First at an angle,

then finally pull them straight apart. There is no glue or any other material that holds the PSU together.

Here are the two parts separated and the fan wire is visible.

Remove the connector by

pulling the tab in a direction away from the connector and then pulling upwards.

With the fan disconnected both pieces can now be separated.

The first obvious thing visible is the abundant use of thermal paste. It is found on top of every heatsink and large capacitor.

Here is the circuit board still in the bottom case.

Nothing holds it down, simply lift it out of the case.

Circuit board and case separated

There is large EMI metal shield soldered to the PCB, that needs to be removed.

Use a soldering iron, flux and a desoldering wick to remove the left

and right solder connection.

Remove the shield.

Here is the PSU circuit board without shield.

On the inside of the top part of the case, is a plastic (may be Kapton) tape that need to be removed. Simply pulling on it will release it.

Here is the reason for the abundant amount of thermal paste seen earlier. All the top ends of the heatsinks as well as the capacitors make contact to this larger heatsink. The previously removed plastic sheet is an electrical insulator

Remove the six Phillips screws.

Remove the heatsink from the case. The six screws are identical in length. Underneath the heatsink is the fan

Remove the four small Philips screws. They are 1/4 inch in length and all are identical.

pull the metal top out,

and then the fan. Dust and debris from usage are clearly visible.

Here is the top part of the PSU, minus the heatsink and the fan.

Parts that need to be checked if the PSU has failed, are

the fuse

and the thermistor.