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Okay, so I have a couple of these power supplies and thought I might as well see what's in it and how difficult this will be. The one being torn down is a 175w PSU, identifiable simply by the label as well as by the plug. As with any power supply, make sure that it is unplugged before even thinking of working on it. It is absolutely imperative to discharge the large capacitors before working on this PSU. It has enough oomph to cause serious bodily harm!!!

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

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

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    • 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.

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    • 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

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    • 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.

      • Do not try to totally separate the two pieces. There is a fan wire that still needs to be disconnected.

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    • 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.

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    • 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

    Can anyone tell me the capacitor used just beside power input?

    Fawad Jabbar - Contestar

    • 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.

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    • 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.

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    • 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

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    • 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.

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

    • The disassembly was quick and easy. Interestingly enough there are PSU's for the Xbox that use security screws. Fancy name for proprietary screws that require special tools. The next two images are from a 150W PSU. It appears to be a Torx screw with a center pin. So make sure you have the right tools for the job.

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

    • the fuse

    • and the thermistor.

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PSU fan spins up the a red light. Checked thermistor and it seems in range 8ohm at room temperature, around 5 ohm at 100c, consistent increase with cooling and decrease with heat, no equipment to test under full load. All big caps look good and test OK in circuit. Starting to think there is something else a muck here. Anybody got any thoughts?

Denis - Contestar

Does the Xbox 360 slim PSU also use a 12v fan? Or does that PSU use a 5v fan?

Tech Savvy - Contestar

If the termistor is gone and I meant disappear how I find what kind I need to get also the fuse can I put a higher amp one in like a 10 amp instead of a 8 ?

negrochiquitablanca - Contestar

just want to know I am in the same boat. I have a X808155-005 with no light and no output. the fuse is good. Haven't checked the thermistor yet but doubt that it would be the problem. I might just buy another. in case someone fixes it, I will check back.

William Peck - Contestar

Hi, from Mark in England, UK. I have a background in electronics servicing working on the old crt based analogue tv sets and vcr’s as well as pro audio and automotive and industrial electronics and I’ve got a good working 203 watt x-box psu and I want to increase the 12 volt output to about 14.4 volts so I can use it to charge big lead-acid batteries and I’ve dismantled the psu as far as removing the little sub panel inside which carries the error detection and control electronics but I’m having trouble trying to figure out which components to change in order to increase the 12 volt output as there appears to be so many feedback circuits, all made with tiny little surface mount components. And there’s three opto-couplers, presumably one for 12 volts, one for 5 volts and one for standby switching. So does anyone here have a circuit diagram (schematic) of the 203 watt psu or does anyone here know where I might be able to get one? Any help most appreciated, thanks in advance, Mark.

gfhcfg34f34g - Contestar

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