Re: xbox 360 blowing mosfet
I removed the mosfets. Soldered an ATX power supply to the ground and the 5V line (output of the mosfets) and the power brick. Then powered the ATX PSU and touched the start button. Voila 3 red ligts in the ring. The error code 0031 meaning RAM not getting power (control for that comes from the same chip) also when powering up for the short while it happens I only get 0V at RAM testpoint with the multimeter. https://xbox-experts.com/errorcode/E13/0031/
xbox 360 blowing mosfet
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Re: xbox 360 blowing mosfet
I have it
Did you try inserting 5V at the output of that rail, though? If you do and the PSU trips, remove the MOSFETs on that rail (I believe that would be Q6F1 and Q6F2) and try again. Leave the coil in place.Leave a comment:
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Re: xbox 360 blowing mosfet
thanks for the testpoints, I had one like it but is a little bit lower resolution, yours looks better.Last edited by waldoalvarez00; 04-22-2016, 03:45 PM.Leave a comment:
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Re: xbox 360 blowing mosfet
Resistance is infinite in both pins of the output coilLeave a comment:
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Re: xbox 360 blowing mosfet
Ahh ok thanks pal, I am gonna check the resistance and report. I was just measuring with the meter in diode mode. Interesting, didn't thought about both FETs on at same time. The controller is ADP1823.Leave a comment:
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Re: xbox 360 blowing mosfet
So putted another mosfet and took the risk to power it on. Well this time it holded and didn't got damaged but the power brick is sensing something as the console spins the fans for a second and then the power brick turns the led red activating sort of an overcurrent protection mechanism.
I've done that before on TV board power supplies, and I can tell you that this method works. But definitely do remove the FETs and even the toroid inductor before doing that. Better yet, first check the resistance on that rail with respect to ground as I suggested in my above post. If you have a dead short-circuit, even your ATX PSU will not like it.
As far as common ground: some Xbox 360 PSUs are grounded and others aren't. But either way, just connect the ground of your ATX PSU to the ground of the Xbox 360 motherboard and it will not be fine.
https://www.badcaps.net/forum/attach...1&d=1461040574
These voltage rails will be quite similar on the Xenon, Zephyr, and Jasper as well, so you can still use the above diagram as a general guide.Last edited by momaka; 04-18-2016, 10:41 PM.Leave a comment:
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Re: xbox 360 blowing mosfet
Sorry for the late reply. Finally have enough time to read through this thread.
You see the one closer to the CPU next to the small black capacitor blew two times. No smoke no holes no nothing. The fan tries to start for a second then it stops entirely. It gets damaged and shows as to resistors on the tester. Maybe the controller chip? Just wondering. I don't have oscilloscope to test.
Though it could also be a short-circuit on that rail (shorted ceramic cap, or some other connector you are missing out). To test that, remove the shorted MOSFET and measure resistance between one of the legs of that toroid inductor and ground. Use the lowest resistance scale on your multimeter (that's usually 200 Ohms on manual meters). Report back what you get.
If there is a short-circuit, that could be the reason why your MOSFET keeps blowing. But if not, then maybe it is the buck controller for that rail that is bad.
I concur.
That's how I would proceed with the troubleshooting as well.Leave a comment:
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Re: xbox 360 blowing mosfet
No no, CPU and/or GPU doesn't feeds from that. One side is 5v for USB + Drives (i think southbridge too). I saw what seemed to be like 3 regulators feeding from there too. The other side of the chip is for RAM. I think is 1.8v, gotta check this again. That is a problem if the chip is totally faulty. In that case would have to use two converters. Or at least a regulator if load ain't too high (otherwise I would burn it). I think that side was ok and the testpoint was giving proper voltage.
Power supply got the possible problem of ground dis-balance. A small swing at ground means a short circuit. So likely will not use PSU. I was reading in another forum that actually grounding the ground would be safe and would do away with that possibility.Leave a comment:
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Re: xbox 360 blowing mosfet
If the supply does not have anything to do this the phases of the pulses then that will not effect the processor. However if the CPU or the Graphic processor relies on a boost voltage through that chip then the power supply you use would have to be compatible with that. You would have to study these ICs and the power supply you are going to use to see if it is compatible.Leave a comment:
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Re: xbox 360 blowing mosfet
Linears are capable of delivering 70 A for a temporary time period. It is like if one needs 70A at 1.8 volts no matter if it is linear or not it will still require components that will have to handle that power. 1.8 X 70 is 126 watts a little more than a 100 watt light bulb. With a primary that can handle say 150 watts the secondary would have to handle 70Amp current using the same components, only less because it would not be so complicated. Because the demand for that type of current would be only for a very temporary basis the linear could be designed to do this while maintaining the 1.8 volts like a rock. As waldoalvarez00 mentioned it would have to be redesign which would not make it worth it.Leave a comment:
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Re: xbox 360 blowing mosfet
BTW I was thinking in this case since I don't have the chip around now. Just inject those 5V from an ATX PSU in the electrolitic capacitor pins, removing the FETs to isolate and see what happens. Problem I think is the common ground. Or another option just use another DC/DC converter and totally bypass the one in the XBox. To be certain and buy the chip later with confidence (or simply leave the patch). No idea if timing would have something to do.
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Re: xbox 360 blowing mosfet
an athlon / p4 vrm can generate 1.8v at upto about 70A
HOW BIG WOULD THAT BE WITH A LINEAR!!!Leave a comment:
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Re: xbox 360 blowing mosfet
Why not just run a linear power supply? It will deliver all the power one may need at a extremely well regulated output and it will not over heat.Leave a comment:
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Re: xbox 360 blowing mosfet
They tend to be more expensive, but capacitor size reduction reduces price and volume on the other side. They are more efficient too.Leave a comment:
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Re: xbox 360 blowing mosfet
Allright check this out:
http://www.powerguru.org/multiphase-buck-converters/
and the waveforms here too:
http://www.tij.co.jp/product/jp/LP87...ed_description
some chips turn on/off phases too.Leave a comment:
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Re: xbox 360 blowing mosfet
multi-phase psu's exist for the same reason as multi-barrel guns,
they can run faster than with a single fet / barrel without overheating.Leave a comment:
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Re: xbox 360 blowing mosfet
My understanding is the duty cycle is determined on how long the pulse is on. The longer time on the higher the duty cycle. So say if the width of the pulse is 50 milli second and the on time is 25 milli second that would be 50% duty cycle. Of course this would all depend on if they are using the positive going and the negative going pulses in the positive direction or if the are only using the positive pulses. Only using the positive pulses one can only obtain 50% duty cycle max. It could also be the 120 degree phase shift and still start the first at 0 degrees the second at 120 degrees and the third at 240 degrees. The second pass the first would be at 0 degrees again. You could very the on time for each pulse for that operation. The overlap could be used to increase voltage to the CPU for when 0 and 120 degree operations were being performed at the same time or when 120 degree and the 240 degree operation was performed together or when 240 degree and the 0 degree operations were performed together. Both operations would have a window of 60 degrees where the voltage to the processor would increase by twice as much maximum. But you say it is not performed this way. You say that two pulses are never happening at the same time. I really do not understand the logic behind that as you could just have one pulse train.Leave a comment:
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Re: xbox 360 blowing mosfet
I am thinking that the different phases are for different operations and different duty cycles for those operations. So I think they keep track of the phase shift of the power to determine which operation that is presently working. This may be done so that certain portions of an operation are not happening at the same time. So with three phase shifts that would be 120 degrees difference from one to the other. So the first phase for the first 120 of the PWM supply nothing but that phase one will turn on, then the second phase starts and at 180 degrees the first phase turns off. This is a bit of a guess. It just seems it would work like this or something similar.Leave a comment:
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Re: xbox 360 blowing mosfet
I am thinking that the different phases are for different operations and different duty cycles for those operations. So I think they keep track of the phase shift of the power to determine which operation that is presently working. This may be done so that certain portions of an operation are not happening at the same time. So with three phase shifts that would be 120 degrees difference from one to the other. So the first phase for the first 120 of the PWM supply nothing but that phase one will turn on, then the second phase starts and at 180 degrees the first phase turns off. This is a bit of a guess. It just seems it would work like this or something similar.Leave a comment:
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Re: xbox 360 blowing mosfet
So Stj works on these on a continual bases and I do not. It would be worth following his advice to see what happens.Leave a comment:
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by ScotchmistI have an Asus GA502D, it had a blown mosfet which I replaced and the laptop booted into windows, a few mins later it shut off, the same mosfet was blown. I thought maybe just a bad mosfet but same thing happened again, a few mins in windows and shuts off.
I have removed the mosfet and can run the laptop no problem
The MOSFET is FDPC5018SG
Can anyone point me in the direction of what could be the cause of this, could it be the controller rt3663bc?
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by JaneI tried to use this method:
Testing an N-channel MOSFET:
Step 1: Discharge the Gate (turn off the MOSFET)
Place the black probe (COM) on the Source (S) and the red probe on the Drain (D). The multimeter should show no continuity (high resistance or "OL" – open line).
Then, touch the black probe to the Source (S) and the red probe to the Gate (G). This discharges any stored charge in the Gate, turning the MOSFET off.
Step 2: Charge the Gate (turn on the MOSFET)
Now, place the red probe on the Gate (G) and the black probe on the...09-27-2024, 03:31 AM -
by TMTGTRFirstly I am not a tech. You guys may see mistakes or oversights in my methods so don't be bashful and feel free to post corrections/opinions.
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