If you are having problems trying to get your original Xbox console to power on, first you should try to use a replacement power cord, before attempting any repair. If that doesn't fix anything, the fuse soldered onto the power supply board is probably burn out. This usually happens if you have recently had an electrical power surge and your console was switched on at the same time. To locate the fuse, you will need to fully disassemble you Xbox console. You will also require a cheap small powered soldering iron to remove the current fuse and solder in another replacement of the same kind.
1) Turn the Xbox upside down. Underneath all four rubber tabs found in each of the four corners, there are special sized torx security screws. You will require a 'torx T20' screwdriver to remove them all. Peal the tab away from the corner slowly, so that the glue doesn't completely remove itself and begin to unscrew. You will also find two more screw in the middle of the Xbox.
2) Turn the Xbox upright, grab the top cover and pull it in the upwards direction. You will now see the game disc CD drive on the left and the hard drive on the right. The power supply board is fitted below the HDD, so you will need to remove it. Look in the middle of both of these devices, you will see another torx screw, which holds the plastic compartment in place. Use a 'torx T10' screwdriver for this one.
3) Unplug the 'IDE' and 'Molex cables from the rear of the hard drive. Then remove the HDD plastic compartment from the inside of the Xbox. You will now see a long power supply board on the right hand side of the console. There will be two small 'torx 'T10' screws in place holding it down. So go-ahead and remove both screws using the appropriate sized screwdriver.
4) Look at the top of the power board, where the power connector goes into. Near that socket, look for a long fuse that is wrapped away in black heat shrink tubing. Usually fuses look easy to identify, but this fuse is a different design altogether. Use the image below to help you out with this.
5) Setup your soldering iron and heat up the two solder joints found at the back of the circuit board, that relate to the fuse. While doing this, hold the fuse from the bottom and pull it downwards, so it can remove itself permanently.
6) Now you will need to get hold of a replacement fuse of the same time. Its rated at the specs of 15 amps and 250 Volts. This design of the fuse is hard to come by, due its lack of availability and compatibility. If it is not possible to get, you could just use an cheap inline fuse holder and connect it directly onto the PCB. Then insert a regular 15 amps glass fuse into it and do the same job.
7) To fit the new replacement fuse, simply reposition it back into its two holes. Then flip the PCB around and apply fresh solder onto the points. If you are going to fit an inline fuse holder, connect the two wires into each hole and solder them in. Which way round you do this makes to difference to the connections whats so ever.
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