[NOTE: This post was updated on 21/02/2011 to remove unnecessary steps – see comments below for more info].
These Acer HTPC’s are notorious for their unreliable power supplies. I replaced mine recently and took photo’s of the procedure. Sorry if some of these are a bit blurred, I used my phone.
First, remove the three screws from the back:
The case just slides off rearwards:
Remove the three screws at the rear holding the PSU in place:
Unplug the PSU molex connector from the motherboard:
Unplug the fan connector from the motherboard:
You will need to cut a cable tie to free the connector:
To remove the power connector from the hard drive, unscrew the 4 screws that secure the hard drive to the chassis (sorry no pic of this). Then you should be able to wiggle the hard drive out far enough to be able to unplug the power connector:
Now that all the connectors have been unplugged, pull the cables out from the cable clip:
Remove the two screws holding the PSU and cable clip bulkhead:
Finally, the PSU can be removed:
Time to get the new PSU out:
New on the left, old on the right, slightly different part numbers, probably because the new will also fit the 510 model and has an extra connector that is not used on the 500:
Follow the reverse of the procedure above to fit the new PSU.
When you rescrew the hard drive back in, you may find some of the screw holes hard to get at and unless you have a magnetised screwdriver you will find it very difficult to get the screws back in. I used a tiny blob of blu-tak on the end of my screwdriver to hold the screw to it so I could guide it to it’s hole and screw it in.
Finally, there is a spare connector that is not used on the 500 model, just tuck it away somewhere safe:
Put everything back to together and with a bit of luck it will all work! 🙂