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Author Topic: O No I Think I Blew A Mosfet!  (Read 96 times)

HackerSupreme

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O No I Think I Blew A Mosfet!
« on: August 03, 2008, 04:25:00 PM »

OK I am really scared I broke my Xbox right now I am like hyper ventilating. So I got some fans on the top of my case and some LEDs, nvm the specifics though.

I have the LEDs running off of 5v, and the fans 12v. I got the 12v from one side of a capacitor that I circled, and the 5v from one of the legs on the MOSFET thingy that I circled. I have 2 little plug thingies for each power source, they both ground out to the top of a memory card connector. I go to plug the fans and leds in, I kinda lower the case down or something, idk what I did, I might have hit the grounded metal chassis I am not too sure, and my 360 goes RROD 0021. No voltage is coming off of the MOSFET leg that I draw 5v from, (well it gives off .21v) Haven't checked the side of the capacitor yet but I think the 12v rail it rides is from the power brick so I think I am fine on that regard.

So I got another broken motherboard I think I can swap MOSFETs. The other motherboard is a Xenon like mine, but it has silver caps, not yellow ones like mine, so it is a newer Xenon I guess IDK, I'll check the numbers on both MOSFETs right now.

So, first off, I want to have mine up and running. So can I just heatgun and remove the good MOSFET from the one board, and remove the bad one, tin the pads with my soldering iron, and then heatgun the good one onto my board? Will that work?

And can I get another one of these from the web somewhere or something? Please any thoughts or help? I am so scared that I bricked my motherboard!

IPB Image
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HackerSupreme

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O No I Think I Blew A Mosfet!
« Reply #1 on: August 03, 2008, 04:53:00 PM »

OK all seems to be ok except the Mosfet. I checked all the voltages on the MOSFETs around the fried one, and they seem fine, I checked the cap and it is 12v. Well 14v but that is normal for my Xbox for some reason. So I think it is the MOSFET only that is broken. And I took some pics of each MOSFET (the broken one and the one I I got on the other bricked motherboard) and I am comparing part numbers now, have yet to look at the pics.

Anyone?

EDIT: I found out it is a 3.3v regulator.

Datasheet

http://www.onsemi.co...l/NCP1086-D.PDF

OK I can get a new one from Mouser. I can also get a LM317 from radioshack I believe and rig it up. But for a temp fix, can I heatgun this off and put one from another board on?

Thanks!
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RDC

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O No I Think I Blew A Mosfet!
« Reply #2 on: August 03, 2008, 06:29:00 PM »

14v is wrong, if you're getting that reading your meter is either screwed up or ya have a bad PSU. The 360 PSU is a just a big 12v SMPS, with a 5vsb, and it's pretty well regulated, so 14v is not right.

If ya had the thing powered up while messing with it ya can expect things like that to happen when you're not paying attention, it's shouldn't be messed with outside of the cage when powered up anyway, just like every other piece or consumer electronics.

If both parts are the same 3.3v Reg. then you can swap them, and it's not a temp fix just because it's a used part. wink.gif
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HackerSupreme

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O No I Think I Blew A Mosfet!
« Reply #3 on: August 03, 2008, 06:42:00 PM »

Well I just swapped voltage regulators, same problem, RROD 0021. I am thinking that it isn't the regulator. Maybe it is the supply voltage to the regulator? I am going to check the regulator I have desoldered, hook it up to a 5v adapter and see if it gives me 3.3v. If so, I don't think the regulator is getting voltage.

And my multimeters battery is super low. Have had a low battery warning for a month or so...so that is why I am getting 14v I guess...
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HackerSupreme

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O No I Think I Blew A Mosfet!
« Reply #4 on: August 03, 2008, 07:11:00 PM »

YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES!!!!!!!!!!!!!!!

HA HA MOFOS!

GOT IT UP AND RUNNING AGAIN!

I test the other voltage regulator, gives off 4 some volts, my multimeter is fucked...so...it seems like this regulator is working....

So WTF...if the regulators are working...I just spent a lot of time and the possibility of bursting some caps (I swelled 2 a little) in moving these bitches...O well...


Turns out that little transistor connecting the 5v to the input pin of the voltage regulator, is blown, or fucked up I have no fucking clue. There is like 0.2 volts or some shit on the input pin of the regulator. It needs to be 5v. Microsoft has this nice little place for a resistor....but there isn't one...what do I do? A little bit of a leg from a resistor that I had laying round....and BOOM MOTHERFUCKER NO MORE RROD FOR ME!

Here is the ghetto drawing, the green sqaure is just showing where I was operating, and the green line is the bridge. (Thanks to RDC for this sick ass picture, your camera rapes)

IPB Image
IPB Image

O yea o yea o yea I got my 360 back up and running...ha ha suck on a fat one! I don't know who should suck it...maybe the demon of bricking shit....idk....

I am so happy right now, my work area is trashed but fuck it I don't give a damn. I am off to play some SHIT!

I have had so many close encounters with bricks...I wish I would brick something FOR GOOD and not have it be repairable...because I feel it is coming up soon...and I hope I don't brick one of my friends things or something...well fuck that I got my 360 up and running again!

I would like to thank Myself, Radioshack for their soldering Iron, some shit store for selling heatguns for 10 bucks on sale, Bill Gates for the internet, and RDC, even though he didn't help me on this project, well he did a little, he gives great advice and insight and has helped me before, and is smart as hell....and I would like to thank God

1. Because everyone thanks God.
2. Because he has helped me out in the past.
3. Because he gave me this big ass brain to fix this shit! Everyone I know, would have bought a new one or some shit, but my IQ is 138 and I fixed this shit. It was a ghetto fix, bridging 2 solder connections, but I got it up and running ha ha in your face!

O yea, O yea, shake my booty, do a little dance! I am so happy.

SUCK A FAT ONE CONSOLE BRICKING DEMON! THE POWER OF ME COMPELS YOU! MU HA HA HA!

Like that shit?

Off to play!
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Wilhelm_I

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O No I Think I Blew A Mosfet!
« Reply #5 on: August 04, 2008, 06:33:00 AM »

QUOTE(HackerSupreme @ Aug 4 2008, 03:47 AM) View Post

1. Because everyone thanks God.
2. Because he has helped me out in the past.
3. Because he gave me this big ass brain to fix this shit! Everyone I know, would have bought a new one or some shit, but my IQ is 138 and I fixed this shit. It was a ghetto fix, bridging 2 solder connections, but I got it up and running ha ha in your face!

O yea, O yea, shake my booty, do a little dance! I am so happy.

SUCK A FAT ONE CONSOLE BRICKING DEMON! THE POWER OF ME COMPELS YOU! MU HA HA HA!

Like that shit?

Off to play!

LOL at this "CONSOLE BRICKING DEMON"...

Congrats mate
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xAKPxplaymate08

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O No I Think I Blew A Mosfet!
« Reply #6 on: February 02, 2011, 12:36:00 PM »

So on the very first picture that hacker put up it shows where the Mosfet is located, and I looked on this xbox and it does not look the same as he pictures. The xbox that I am trying to fix for a friend is giving me the code 0001, bad power supply. But when I plug it into my xbox, it works fine, and that was his power supply to begin with. So what could it be? I looked at the mosfet chip that it is in this xbox and it is not the same it has pins plus the long bar, and it is facing the opposite way. So what other ideas could it be?
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