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Solved Xbox 360 No Power

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JoinTheResistance

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Hi, this is my first post in this forum, so sorry if I mess something up.
I bought this faulty Xenon console a few days ago and I think that I am going to need some help with it. The console doesn't eve turn on. When I press the power on button absolutely nothing happens. The only thing that I've noticed happen after puging the power cord in, is that the ANA chip and a mosfet on it's right side start getting really hot (burning hot) espetially the mosfet. The light on the power supply stays oragne no matter what, so I decided to use a two molex to xbox 360 power plug cable that I made some time ago. The power supply turned it self off the moment I pugled the cable in the 360. I will post picture bellow. I forgot my phone's charger whille travelling so I'll get a photo from the internet and mark the transitor with red. This is what it says on the transistor (in that order, one over the other):
L1117
18
6k1mgb25
I got a datasheet from the internet, but I am not sure about the imput voltage that it's getting from the 360 while in stand by mode. I tested the mosfet with a multimeater and found out that the ground and bottom pin are connected. I also tested a mosfet arround the HANA chip on a falcon and the pins there were also briged (the voltages I got on the falcon were lower, but i think that that is normal, because the mosfet was different and it was a falcon)
Is there any way to determine whether the problem is in the ANA chip or in the mosfet? The 360 been previously repaired (it probably had a RRoD), because there is hot glue arround the gpu and cpu. I think that the repair was professionally done, because there was no warping to the board.
I read online that this problem can be caused by missing conponents arround the AV port, but I didn't see anything like that. I also read that It could be a bad NAND flash, but I also don't find any jtag/rgh/r-jtag or any NAND read attempts. So if it has a bad NAND flash it was probably, because of an update.
The console had a penny trick and an x-clamp replecment done (I'm not sure why).
Any help, suggestions and ideas are welcome and appreciated! :smile:
lpidxRw.jpg

*Edit*
I did some research and found out that the mosfet that I was talking about is actually a stabilizer. I tested it with a multimeter and the input voltage was 4V and the output was 0.9/1V! The stabilizer is rated at 5V input and 1.8V output so I desoldered it and connected it to the 5V rail on a molex on my computer and it gave me 1.8V output. When I tested the input on the board without the stabilizer the input was 5V. The ANA chip also wasn't getting so hot (it was still warm, but the HANA on my falcons is also a bit warm when in standby, so I think that this is normal). I soldered it back to the board and the input voltage dropped again to 4V, so I desoldered only the output pin and then something very strange happened the input dropped to 3.8V and the output to 0.1V. I also desoldered the coils to test the mosfets near the power plug following these two tutorials. http://www.360-hq.com/xbox-tutorials-176.html
http://forums.xbox-experts.com/viewtopic.php?t=538
I am going to try to find the same stabilizer at a local shop tomorrow and report back to tell you if there is any change to the board.
 
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XeDK

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Xenon no power i would just trash it and get a better motherboard (i mean no disrespect).
Not worth fixing
 
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JoinTheResistance

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Xenon no power i would just trash it and get a better motherboard (i mean no disrespect).
Not worth fixing
Accually it is worth it to me so I am not giving up on this board until it's 100% dead. Thx for the post anyway :smile:
 
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XeDK

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Accually it is worth it to me so I am not giving up on this board until it's 100% dead. Thx for the post anyway :smile:
Really want to buy like 30 xenon boards i have sitting around that i think are trash?
 
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JoinTheResistance

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Really want to buy like 30 xenon boards i have sitting around that i think are trash?
No I think you didn't understand me. What I tried to say was that I want to keep trying to fix the board until it is trash.
 
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iXtremePro

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If all else fails, just heat gun the whole board.
 
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chaudhrywaseem7

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I have faced same issue
1: reflow
2:regulator
Then... Next what?
Guide me please
 
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BluesMan67

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Hi, this is my first post in this forum, so sorry if I mess something up.
I bought this faulty Xenon console a few days ago and I think that I am going to need some help with it. The console doesn't eve turn on. When I press the power on button absolutely nothing happens. The only thing that I've noticed happen after puging the power cord in, is that the ANA chip and a mosfet on it's right side start getting really hot (burning hot) espetially the mosfet. The light on the power supply stays oragne no matter what, so I decided to use a two molex to xbox 360 power plug cable that I made some time ago. The power supply turned it self off the moment I pugled the cable in the 360. I will post picture bellow. I forgot my phone's charger whille travelling so I'll get a photo from the internet and mark the transitor with red. This is what it says on the transistor (in that order, one over the other):
L1117
18
6k1mgb25
I got a datasheet from the internet, but I am not sure about the imput voltage that it's getting from the 360 while in stand by mode. I tested the mosfet with a multimeater and found out that the ground and bottom pin are connected. I also tested a mosfet arround the HANA chip on a falcon and the pins there were also briged (the voltages I got on the falcon were lower, but i think that that is normal, because the mosfet was different and it was a falcon)
Is there any way to determine whether the problem is in the ANA chip or in the mosfet? The 360 been previously repaired (it probably had a RRoD), because there is hot glue arround the gpu and cpu. I think that the repair was professionally done, because there was no warping to the board.
I read online that this problem can be caused by missing conponents arround the AV port, but I didn't see anything like that. I also read that It could be a bad NAND flash, but I also don't find any jtag/rgh/r-jtag or any NAND read attempts. So if it has a bad NAND flash it was probably, because of an update.
The console had a penny trick and an x-clamp replecment done (I'm not sure why).
Any help, suggestions and ideas are welcome and appreciated! :smile:
lpidxRw.jpg

*Edit*
I did some research and found out that the mosfet that I was talking about is actually a stabilizer. I tested it with a multimeter and the input voltage was 4V and the output was 0.9/1V! The stabilizer is rated at 5V input and 1.8V output so I desoldered it and connected it to the 5V rail on a molex on my computer and it gave me 1.8V output. When I tested the input on the board without the stabilizer the input was 5V. The ANA chip also wasn't getting so hot (it was still warm, but the HANA on my falcons is also a bit warm when in standby, so I think that this is normal). I soldered it back to the board and the input voltage dropped again to 4V, so I desoldered only the output pin and then something very strange happened the input dropped to 3.8V and the output to 0.1V. I also desoldered the coils to test the mosfets near the power plug following these two tutorials. http://www.360-hq.com/xbox-tutorials-176.html
http://forums.xbox-experts.com/viewtopic.php?t=538
I am going to try to find the same stabilizer at a local shop tomorrow and report back to tell you if there is any change to the board.
Had the same kind of issue myself with a Falcon board (pressed the button and instantly went to 3 red lights,with secondary error code 0001) all i did was replaced ALL the MOSFETS from a scrap Falcon board i had in a spares box and that did the job.
So get yourself a dirt cheap RROD Xenon board off good ol Ebay and swap out 1 by 1 those MOSFETS near the H/ANA chip and to be on the safe side,replace the ones near the power socket as well.
I used my hot air rework station (with the temp set to 310) and that board is now alive and kicking once more.
So yeah,don't give up on it just yet,buddy.
 
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