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[chris_mouland3]

Hi,
my bro has a dead xbox 360, which just does not power up or do anything. We have tested his power supply on another xbox360 and it works fine. We have also tested another power supply on his xbox360 and it's still dead.

Does anyone here have any ideas what could be wrong? I haven't opened it up yet so I dont know what's inside.
Is there an internal fuse that may have burned?

I would be grateful for any serious sugggestions from people that have opened up xboxs in the past or who have fixed this type of problem.

Many thanks,
Chris.


If there are any better places for this to go, can you move it please mods? Thanks (IMG:style_emoticons/default/rolleyes.gif)

[IAmCanadian]

do you still have a warrenty?

[chris_mouland3]

No, it's out of warranty.
I just wondered whether anyone else knew whether there is likely to be a fuse or other component inseide that wouldbe easy to fix.

[68HC000]

G0T M4xx would be your man. He screws around with the finicky electrical components of the 360's motherboard.

[chris_mouland3]

Thanks 68.
I'll try and get in contact with G0T M4xx.

If anyone else can spread any knowledge, then feel free  (IMG:style_emoticons/default/biggrin.gif)

[IAmCanadian]

Does the 360 completly not power up? as if pushing the power button does nothing?

could be a capacitor that went caput or even a resistor/capacitor

[G0t M4xx 21]

Chris, I replied to your PM on this, but to spread knowledge on the scene, I will post basically what I said in my PM (a little bit more detailed):

If the PSU is confirmed working, it is either something wrong with the microcontroller in the southbridge that controls the power on sequence, the linear regulator that powers it and/or the ROL board, or a short in the 5V standby (blown capacitor, transistor, etc).

The easy way to determine which one of these is the problem is to look at the light on the PSU, if when you plug it into the 360 it turns red briefly (or stays red), there is a short on the standby power (If the short was on the switched supply, the 360 would power up then flash 3 red lights with error 0001 or 0002, or power up for a split second then shut itself off). Also measuring the resistance from 5VSB to ground is a pretty sure fire way to tell

If the 5V standby power is NOT shorted, then the issue is either in the power button on the RF board (easily tested by powering up the box via another method), the southbridge, the the voltage regulator supplying it.

The two regualtors are U5B1 (3.3V) and U5B2 (1.8V). They are located on the top of the motherboard near the back, jsut to the left of the large screw hole in the center of the motherboard (near the fans). The large tab opposite the 2 smaller pins is the output of each regulator, so they should measure 3.3v and 1.8v respectively when the 360 is in standby (off but plugged in).

If those measure ok, then I'd say the southbridge is dead (that motherboard is nothing but a nice paperweight)

[neoikon]

QUOTE(G0t M4xx 21 @ Aug 20 2006, 06:56 PM)

Chris, I replied to your PM on this, but to spread knowledge on the scene, I will post basically what I said in my PM (a little bit more detailed):

If the PSU is confirmed working, it is either something wrong with the microcontroller in the southbridge that controls the power on sequence, the linear regulator that powers it and/or the ROL board, or a short in the 5V standby (blown capacitor, transistor, etc).

The easy way to determine which one of these is the problem is to look at the light on the PSU, if when you plug it into the 360 it turns red briefly (or stays red), there is a short on the standby power (If the short was on the switched supply, the 360 would power up then flash 3 red lights with error 0001 or 0002, or power up for a split second then shut itself off). Also measuring the resistance from 5VSB to ground is a pretty sure fire way to tell

If the 5V standby power is NOT shorted, then the issue is either in the power button on the RF board (easily tested by powering up the box via another method), the southbridge, the the voltage regulator supplying it.

The two regualtors are U5B1 (3.3V) and U5B2 (1.8V). They are located on the top of the motherboard near the back, jsut to the left of the large screw hole in the center of the motherboard (near the fans). The large tab opposite the 2 smaller pins is the output of each regulator, so they should measure 3.3v and 1.8v respectively when the 360 is in standby (off but plugged in).

If those measure ok, then I'd say the southbridge is dead (that motherboard is nothing but a nice paperweight)

I recently ran into the dreaded 3RLoD, so I performed the MKIII mod (I’ve built many PCs through the years, so this was a pretty straight forward mod).  When I put it back together and try turning it on, the power supply instantly goes to red.  It’s not a heat problem, since the box wasn’t even running.  After visual inspection of the board, I don’t see anything obviously wrong (metal flakes causing a short, etc).  Since there are no symptoms or error codes, it makes it very hard to debug.

When I have the PS plugged in the wall, then plug it into the 360, the PS stays orange.  From your post, this implies there isn’t a short in the standby power.  Since the PS immediately goes red and doesn’t actually power up, I never get a 0001 or 0002 error (or 3 red lights).  Unfortunately, I don’t have the equipment to determine voltage levels, so I can’t perform the test on the regulators like you suggest.

This is a first gen 360 that I have luckily been pretty lucky with… so far.  I have performed the firmware and MKIII mods, so I can’t just mail it into M$ ;]

Any tips you could provide would greatly help me out, because right now I am at a loss!

[ivota]

QUOTE

so they should measure 3.3v and 1.8v respectively when the 360 is in standby (off but plugged in).

If those measure ok, then I'd say the southbridge is dead (that motherboard is nothing but a nice paperweight)

Thanky for answer.
I have dead southbridge.
I found 3.3v and 1.8v, error 0001.
Motherboard go to trash !!

[neoikon]

QUOTE(G0t M4xx 21 @ Aug 20 2006, 06:56 PM)

The two regualtors are U5B1 (3.3V) and U5B2 (1.8V). They are located on the top of the motherboard near the back, jsut to the left of the large screw hole in the center of the motherboard (near the fans). The large tab opposite the 2 smaller pins is the output of each regulator, so they should measure 3.3v and 1.8v respectively when the 360 is in standby (off but plugged in).

If those measure ok, then I'd say the southbridge is dead (that motherboard is nothing but a nice paperweight)

So, I got a voltage tester and I see that U5B1 is 3.3v and U5B2 is 1.8v during standby, as expected.  I have tried turning on the 360 via the controller and the front button with the same result, so I don't believe there is an issue there.  When I plug in the power supply into the 360 while the PSU is plugged into the wall the PSU light stays orange, as expected.  The PSU light only turns red when I try and turn on the 360.  It turns red immediately so I don't get any error codes to troubleshoot.  I have also tried a second PSU on my machine with the same result, while my PSU works fine with another 360 (pointing to a problem with my 360 and not the PSU).

I have also tried disconnecting everything from the mainboard, so it was just a naked board outside the case with only the power supply plugged in and I still get the PSU red light immediately upon turning on.

Is there any other method or test I can do to locate the short?  Or, do I have a dead southbridge and I have to go buy another machine?

Any help is greatly appreciated!
neoikon

[pezzapoo]

I have a working PSU, 0001 error. The PSU flashes red once before going back to amber and then i get 3rlod. I have 3.3v and 2.8v as above so is it the end for my mobo too? :-( thanks alot, great thread, very technical.

[3redlightfan817]

i just now had this problem and i'm looking around all over for answer for the problem...i had heat gun my south board of my xbox 360 cause i thought it would fix 0021 error code..turns out right when i cooled off my board i turn it on and nothing happen...i Had a red light then i unplug the xbox and replug it back in it stayed orange and i try to power it up it stay on oragne again on standby...Can anybody help me on this if it's just brick or not i can't tell...

[Jeeepman]

QUOTE(neoikon @ Dec 14 2007, 01:42 AM)

I recently ran into the dreaded 3RLoD, so I performed the MKIII mod (I’ve built many PCs through the years, so this was a pretty straight forward mod).  When I put it back together and try turning it on, the power supply instantly goes to red.  It’s not a heat problem, since the box wasn’t even running.  After visual inspection of the board, I don’t see anything obviously wrong (metal flakes causing a short, etc).  Since there are no symptoms or error codes, it makes it very hard to debug.

When I have the PS plugged in the wall, then plug it into the 360, the PS stays orange.  From your post, this implies there isn’t a short in the standby power.  Since the PS immediately goes red and doesn’t actually power up, I never get a 0001 or 0002 error (or 3 red lights).  Unfortunately, I don’t have the equipment to determine voltage levels, so I can’t perform the test on the regulators like you suggest.

This is a first gen 360 that I have luckily been pretty lucky with… so far.  I have performed the firmware and MKIII mods, so I can’t just mail it into M$ ;]

Any tips you could provide would greatly help me out, because right now I am at a loss!

 

I have the exact same problem.  Did anyone ever find an answer for you on this one?

[kraziemofo]

ok I have this problem now with my psu light is red the U5B1 and U5B2 regulators dont match the volts they should be at so what do i do next? my 360 wont even turn on

[RDC]

QUOTE(kraziemofo @ Jul 29 2008, 05:33 PM)

ok I have this problem now with my psu light is red the U5B1 and U5B2 regulators dont match the volts they should be at so what do i do next? my 360 wont even turn on

Try another PSU first, if it goes Red as soon as it's plugged up or if your PSU is doing that, then the problem is in the 360. What exactly is hard to say without knowing what ya have done to it, and if ya did do anything ya need to start looking there as 9/10 times that's where the problem will be.

A Red light on the PSU usually means there's a short in the 360 somewhere, so if ya soldered anything in there double check it and remove it to see if that straightens it out. If ya did an  X-clamp replacement on it undo it as ya may have the heatsink hitting something on the board causing a short. If it's just up and done it on it's own and another PSU doesn't work either it could be any number of things.